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DC 9411Mental DisordersGoverned by 38 CFR § 3.310

Secondary Conditions for Posttraumatic stress disorder

Posttraumatic stress disorder is a service-connected condition that can cause or aggravate 13 additional disabilities under 38 CFR § 3.310. Common secondaries include Alcohol Use Disorder (Substance Abuse), Erectile Dysfunction, Gastroesophageal Reflux Disease (GERD). Each secondary requires medical nexus evidence linking it to the primary, documented in treatment records or a private nexus letter.

“Disability which is proximately due to or the result of a service-connected disease or injury shall be service connected.”
Evidence Strength:STRONGMODERATEEMERGING

Which secondary conditions are most common after Posttraumatic stress disorder?

Bruxism / Tooth Damage

MODERATE

Medical Rationale

PTSD produces nocturnal and diurnal bruxism through chronic stress-mediated activation of the trigeminal motor nucleus. The elevated sympathetic nervous system activity, hyperarousal, and disturbed sleep architecture in PTSD drive rhythmic masticatory muscle activity (RMMA) during sleep. PTSD patients have 3-4x higher bruxism prevalence than the general population. Nocturnal bruxism generates occlusal forces of 250-500 pounds, far exceeding normal chewing forces of 70-100 pounds, producing enamel attrition, tooth fractures, crown failures, and eventual tooth loss. Medications commonly prescribed for PTSD (SSRIs, particularly sertraline and paroxetine) further increase bruxism incidence through serotonergic effects on the trigeminal motor pathway.

Key Studies

Fernandes G et al. (2014) J Am Dent Assoc (PTSD and bruxism association); Lavigne GJ et al. (2003) J Dent Res (sleep bruxism mechanisms); Garrett AR & Hawiger J (2018) Oral Surg Oral Med Oral Pathol Oral Radiol (PTSD and oral health).

Filing Tips

Dental records documenting tooth wear patterns, fractures, and restorative work. Night guard prescription from dentist. Dentist nexus letter connecting PTSD-related stress and sleep disturbance to bruxism and tooth damage. Document SSRI medication as an aggravating factor. 38 CFR 4.150, DC 9913 rates loss of teeth only where it is due to loss of substance of the body of the maxilla or mandible and the lost masticatory surface cannot be restored by a suitable prosthesis, which bruxism wear alone does not establish, so the captured schedule provides no compensable evaluation for the tooth damage itself. (capture cfr-4.150) Include photos of tooth damage if available.

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Temporomandibular Joint Disorder (TMJ) / Bruxism

DC 9905
MODERATE

Medical Rationale

PTSD causes sustained elevation of physiological arousal that manifests as chronic muscle tension, including masseter, temporalis, and pterygoid muscle hypertrophy and bruxism (involuntary teeth grinding/clenching). PTSD-associated hyperarousal during sleep drives nocturnal bruxism, the primary cause of TMJ derangement, articular disk displacement, and myofascial pain. Elevated cortisol and norepinephrine in PTSD increase muscle tone throughout the body, and the jaw muscles are particularly affected given their proximity to the brainstem areas (locus coeruleus, raphe nucleus) dysregulated in PTSD. Prospective studies in veterans confirm the PTSD → bruxism → TMD pathway.

Key Studies

Korszun A (2002) Oral Surg Oral Med; Muzalev K et al. (2017) J Oral Facial Pain Headache (PTSD/anxiety and bruxism); Lavigne GJ et al. (2008) Sleep (sleep bruxism mechanisms); Ahlberg J et al. (2004) J Oral Rehabil (stress and bruxism).

Filing Tips

Dental records documenting tooth wear (attrition), fractured teeth, masseter muscle hypertrophy, jaw clicking/locking, or TMJ dysfunction on examination. Polysomnography may document sleep bruxism. Request a nexus letter from your dentist, oral surgeon, or oral medicine specialist connecting PTSD-related hyperarousal and sleep disturbance to bruxism and TMD onset. 38 CFR 4.150, DC 9905 evaluates temporomandibular disorder on the maximum unassisted vertical opening (the interincisal range) together with any dietary restriction to mechanically altered foods, or on lateral excursion of 0 to 4 mm, and Note (1) does not combine the two. Note (2) puts the normal maximum unassisted vertical opening at 35 to 50 mm, so ask the examiner to record the measurement in millimeters. (capture cfr-4.150)

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Weight Gain → Obstructive Sleep Apnea (Medication-Induced Pathway)

DC 6847
MODERATE

Medical Rationale

Multiple medications used for PTSD treatment cause clinically significant weight gain, which is the primary modifiable risk factor for obstructive sleep apnea. Atypical antipsychotics prescribed for PTSD-related nightmares and hyperarousal (mirtazapine, quetiapine, olanzapine, risperidone) cause weight gain through H1 histamine receptor antagonism (increased appetite and carbohydrate craving) and 5-HT2C blockade (reduced satiety signaling). Paroxetine (an SSRI) causes more weight gain than other SSRIs. Mood stabilizers such as valproate cause significant weight gain via insulin resistance. Each 10 kg of weight gain increases the odds of OSA by 6-fold through increased peripharyngeal fat deposition, reduced functional residual lung capacity, and worsened upper airway critical closing pressure. This creates a valid medication-mediated nexus chain: PTSD → medication → weight gain → OSA.

Key Studies

Wetterling T (2001) Drug Saf (antipsychotic weight gain); Apovian CM et al. (2003) Obes Res (psychotropic weight gain mechanisms); Peppard PE et al. (2013) Am J Epidemiol (weight gain and OSA incidence); Young T et al. (2005) Epidemiology (body weight and OSA).

Filing Tips

Weight records from medical files documenting weight gain temporally correlated with PTSD medication initiation. Prescription records documenting the weight-gain-causing medication. Polysomnography documenting OSA. A nexus letter from a sleep medicine physician or internist addressing the medication-induced weight gain as the proximate cause of OSA development strengthens the claim. This is a two-step nexus (PTSD → medication-induced weight gain → OSA) that is legally valid under 38 CFR § 3.310 as the OSA is proximately due to the PTSD-required treatment.

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Alcohol Use Disorder (Substance Abuse)

STRONG

Medical Rationale

Self-medication of PTSD symptoms through alcohol is one of the most studied behavioral comorbidities in combat veterans. Alcohol temporarily dampens amygdala hyperreactivity, reduces nightmares, and blunts hyperarousal, the exact symptoms PTSD-sufferers seek to control. Chronic ethanol use progressively dysregulates GABA-A receptor function, NMDA glutamate signaling, and dopamine reward circuits, creating neuroadaptive dependence that mirrors and worsens PTSD neurobiological changes. The National Comorbidity Survey found 52% of men with PTSD have lifetime alcohol use disorder. VA recognizes alcohol use disorder as a secondary service-connected condition when it develops as a result of self-medicating PTSD symptoms.

Key Studies

Kessler RC et al. (1995) Arch Gen Psychiatry; Brady KT & Sinha R (2005) Am J Psychiatry (stress and substance use neurobiology); Pietrzak RH et al. (2011) Drug Alcohol Depend (OEF/OIF veteran cohort); Jacobsen LK et al. (2001) Am J Psychiatry (PTSD and AUD in veterans); VA/DoD CPG for AUD (2021).

Filing Tips

This is a frequently contested secondary claim. The key is establishing a clear timeline: PTSD diagnosis predated significant alcohol use, and the veteran used alcohol specifically to manage PTSD symptoms (hyperarousal, nightmares, insomnia). Buddy statements, counseling records, and physician statements documenting the self-medication narrative are critical. The VA may try to deny under the "willful misconduct" doctrine, alcohol use secondary to PTSD does NOT constitute willful misconduct per 38 CFR § 3.301(c). A strong IMO/nexus letter from a psychiatrist is essential.

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STRONG

Medical Rationale

Erectile dysfunction (ED) in PTSD-affected veterans results from multiple concurrent mechanisms. Chronic HPA-axis activation suppresses hypothalamic-pituitary-gonadal axis function, reducing testosterone levels essential for libido and erectile function. Sympathetic nervous system hyperactivation (elevated norepinephrine) causes sustained vasoconstriction of penile arterioles, directly impairing the parasympathetically-mediated vasodilation required for erection. Psychiatric medications commonly used for PTSD independently cause sexual dysfunction as a side effect, and this medication pathway is part of the same claim rather than a second one: SSRIs raise hypothalamic serotonin, which tonically inhibits the dopaminergic pathways driving desire and orgasm through 5-HT2A and 5-HT3 receptors; SNRIs add alpha-adrenergic vasoconstriction of genitourinary smooth muscle; antipsychotics raise prolactin, which suppresses gonadal function. Reported rates of SSRI-associated sexual dysfunction run from 30 to 70 percent in systematically assessed cohorts, and the presentation can include delayed ejaculation, anorgasmia and reduced libido as well as erectile dysfunction. PTSD-associated hypervigilance and emotional numbing disrupt sexual arousal neuropsychologically. Studies in OEF/OIF veterans report 30–39% ED prevalence associated with PTSD.

Key Studies

Helmer DA et al. (2013) J Sex Med (OEF/OIF veterans and ED); Breyer BN et al. (2014) Urology (PTSD and sexual dysfunction); Letourneau EJ et al. (1997) Behav Res Ther; Kotler M et al. (2000) J Trauma Stress (sexual dysfunction in combat PTSD); Serretti A & Chiesa A (2009) J Clin Psychopharmacol (meta-analysis of antidepressant-associated sexual dysfunction); Montejo AL et al. (2001) J Clin Psychiatry.

Filing Tips

ED is rated separately from PTSD. 38 CFR 4.115b, DC 7522 (erectile dysfunction, with or without penile deformity) carries a 0 percent evaluation, and its footnote directs a review for entitlement to special monthly compensation under 38 CFR 3.350. 38 CFR 3.350(a) provides that special monthly compensation under 38 U.S.C. 1114(k), known as SMC-K, is payable for anatomical loss or loss of use of one or more creative organs, in addition to the basic rate of compensation otherwise payable on the basis of degree of disability, and 38 CFR 3.350(a)(1) states how loss of a creative organ is shown, so the urology examination findings are what carry it. (captures cfr-4.115b, cfr-3.350) File VA Form 21-526EZ listing ED as secondary to PTSD. Include urology records and testosterone levels. If a PTSD medication contributes, add the prescription record with its onset date, mental health records noting the dysfunction as a treatment side effect, and a nexus letter from the prescribing psychiatrist stating in terms that the dysfunction is a side effect of medication required for service-connected PTSD. The direct pathway and the medication pathway support the SAME secondary claim; you do not file twice.

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STRONG

Medical Rationale

PTSD-associated autonomic nervous system dysregulation directly impairs lower esophageal sphincter (LES) function. Chronic stress activates the sympathetic nervous system, which inhibits parasympathetic control of esophageal motility, reduces LES tone, delays gastric emptying, and increases esophageal acid exposure time. Elevated cortisol and adrenaline increase gastric acid secretion. Studies consistently show 30–65% GERD prevalence in PTSD cohorts. PTSD-induced sleep disruption compounds GERD by causing nocturnal acid reflux during fragmented, non-restorative sleep when clearance mechanisms are impaired.

Key Studies

Maguen S et al. (2014) Gen Hosp Psychiatry (GERD comorbidity in veterans); Holtmann G et al. (2004) Gut (stress and GERD pathophysiology); Mayer EA (2000) Gastroenterology (stress and GI motility); Feinstein AR et al. (1991) J Psychosom Res.

Filing Tips

Submit upper endoscopy (EGD) results or esophageal pH monitoring data documenting reflux. A nexus letter from your gastroenterologist or psychiatrist linking PTSD-related autonomic dysfunction to GERD onset/aggravation is critical. 38 CFR 4.114, DC 7206 (gastroesophageal reflux disease) rates GERD on documented esophageal stricture severity (0/10/30/50/80 percent, 80 percent maximum): every compensable level states a documented history of esophageal stricture(s), and the 10 percent level is a documented history of esophageal stricture(s) that requires daily medications to control dysphagia otherwise asymptomatic. (capture cfr-4.114) The current 38 CFR 4.114 prints no criteria for the former DC 7346: that code now reads "Rate as esophagus, stricture of (DC 7203)."

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STRONG

Medical Rationale

PTSD fundamentally dysregulates threat-detection neural circuits, specifically the amygdala-prefrontal cortex axis, in ways that persistently amplify anxiety responses to non-threat stimuli. Chronic noradrenergic hyperactivation (elevated norepinephrine, depleted alpha-2 autoreceptor inhibition) seen in PTSD directly creates the hallmark physiological arousal of generalized anxiety: muscle tension, autonomic hyperactivation, excessive worry, and concentration deficits. Studies show 16–23% of PTSD patients develop comorbid GAD. The hypervigilance, sleep disturbances, and irritability of PTSD prime the neural pathways for generalized anxiety response patterns.

Key Studies

Kessler RC et al. (1995) NCS comorbidity data; Bremner JD et al. (1996) Am J Psychiatry (noradrenergic mechanisms); Pietrzak RH et al. (2011) Depress Anxiety (anxiety comorbidity in combat veterans); VA/DoD Clinical Practice Guidelines for PTSD (2023).

Filing Tips

Include a statement from your treating psychiatrist distinguishing GAD symptoms from core PTSD hyperarousal if the VA attempts to deny the claim as duplicative. Diary entries or symptom logs documenting worry, tension, and anxiety symptoms beyond PTSD core criteria can support the separate diagnosis. Generalized anxiety disorder is evaluated under 38 CFR 4.130, DC 9400, on the General Rating Formula for Mental Disorders, which turns on the degree of occupational and social impairment. (capture cfr-4.130)

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STRONG

Medical Rationale

PTSD produces sustained hypertension through chronic hyperactivation of the sympathetic nervous system and HPA axis. Persistently elevated catecholamines (epinephrine, norepinephrine) increase heart rate and peripheral vascular resistance. Chronic cortisol elevation causes sodium retention, increases angiotensin-converting enzyme activity, and promotes vascular stiffness. The autonomic dysregulation in PTSD creates a pattern of 24-hour elevated blood pressure with loss of the normal nocturnal dipping pattern (non-dipping hypertension), which is associated with increased cardiovascular mortality. Multiple epidemiological studies of veterans and civilian PTSD populations confirm elevated hypertension incidence with PTSD, independent of other cardiovascular risk factors.

Key Studies

Pole N et al. (2011) Biol Psychiatry; Kibler JL et al. (2009) Psychosom Med; Edmondson D et al. (2013) Psychosom Med (PTSD and incident hypertension meta-analysis); Vaccarino V et al. (2013) JAMA Psychiatry (Vietnam veteran twin study).

Filing Tips

Document blood pressure readings over time (home BP log, physician records). A nexus letter from your treating physician explaining the sympathetic nervous system mechanism is highly effective. Hypertension is one of the most common secondary conditions claimed. If hypertension subsequently leads to heart disease or kidney disease, those conditions can be claimed as secondary to the secondary (hypertension, which is secondary to PTSD).

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STRONG

Medical Rationale

The gut-brain axis (enteric nervous system + CNS) is profoundly disrupted by PTSD. Chronic HPA-axis activation increases intestinal permeability ("leaky gut"), dysregulates colonic motility via the enteric nervous system (ENS), and alters the gut microbiome composition. Elevated CRF in PTSD directly stimulates mast cell degranulation in the gut mucosa, activating submucosal neurons and producing the visceral hypersensitivity characteristic of IBS. Meta-analyses confirm that anxiety and PTSD are among the strongest psychosocial predictors of IBS development, with PTSD conferring a 3-fold increased odds of IBS. Military sexual trauma (MST) survivors have particularly high rates of comorbid IBS.

Key Studies

Blanchard EB et al. (2006) J Psychosom Res (PTSD/IBS nexus); Mayer EA et al. (2001) Am J Physiol (gut-brain axis and stress); Saito YA et al. (2010) Am J Gastroenterol (CRF and visceral hypersensitivity); Gradus JL et al. (2015) Am J Gastroenterol (Danish cohort, PTSD → IBS); Kovacic K et al. (2022) J Pediatr Gastroenterol Nutr.

Filing Tips

Obtain a gastroenterology nexus letter documenting the gut-brain axis connection between your PTSD and IBS. Submit colonoscopy records ruling out IBD (confirming functional/IBS diagnosis). Rome IV criteria documentation from your gastroenterologist strengthens the diagnosis. Under 38 CFR 4.114, DC 7319 the evaluation turns on how often abdominal pain related to defecation occurred during the previous three months, together with at least two of: change in stool frequency, change in stool form, altered stool passage (straining or urgency), mucorrhea, abdominal bloating, or subjective distension. Pain at least one day per week is the highest of the three levels; medication use alone does not set the evaluation. (capture cfr-4.114)

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STRONG

Medical Rationale

PTSD and Major Depressive Disorder (MDD) share overlapping neurobiological substrates and co-occur in 48–50% of PTSD cases (Kessler et al., 1995; Brady et al., 2000). Chronic HPA-axis hyperactivation in PTSD elevates cortisol, which suppresses hippocampal neurogenesis and depletes monoamine neurotransmitters (serotonin, dopamine, norepinephrine) that regulate mood. The amygdala hyperreactivity and prefrontal cortex hypoactivity seen in PTSD directly predispose to anhedonia and depressed mood. Shared inflammatory dysregulation (elevated IL-6, TNF-alpha) further drives depressive symptomatology. The two conditions are rated separately even when comorbid, a veteran with PTSD rated 50% may additionally receive 30% for MDD if the depression is a distinct condition beyond the PTSD core symptoms.

Key Studies

Kessler RC et al. (1995) Arch Gen Psychiatry 52:1048 (48.5% lifetime MDD comorbidity in PTSD); Brady KT et al. (2000) J Clin Psychiatry (neurobiological overlap); Spinhoven P et al. (2010) J Affect Disord (longitudinal comorbidity development); Flory JD, Yehuda R (2015) Dialogues Clin Neurosci (HPA axis and stress in comorbid PTSD/MDD).

Filing Tips

File VA Form 21-526EZ listing MDD as a secondary condition to your service-connected PTSD. Request a nexus letter from your treating psychiatrist or psychologist explicitly stating the MDD is "at least as likely as not" caused by or aggravated by your PTSD. Submit your complete mental health treatment records. The VA often tries to merge PTSD and MDD into a single rating, push back if depression represents a separate functional impairment from your PTSD.

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STRONG

Medical Rationale

PTSD and migraines share overlapping central sensitization mechanisms. PTSD-associated chronic stress creates sustained activation of the hypothalamic-pituitary-adrenal axis and continuous cortical hyperexcitability, the neurophysiological substrate for migraine initiation. Elevated norepinephrine and corticotropin-releasing factor in PTSD are established migraine triggers that reduce the threshold for cortical spreading depression (the electrophysiological event underlying migraine). Studies of OEF/OIF veterans show migraine prevalence of 36% in PTSD-diagnosed veterans versus 14% in those without PTSD. Sleep deprivation (a universal PTSD feature) is one of the most potent and consistent migraine triggers.

Key Studies

Peterlin BL et al. (2011) Cephalalgia (PTSD and migraine epidemiology); Afari N et al. (2015) Pain (OEF/OIF cohort study); Theeler BJ et al. (2013) Cephalalgia (post-deployment headaches and PTSD); Seng JS et al. (2006) J Head Pain (bidirectional relationship).

Filing Tips

Keep a headache diary documenting frequency, duration, and severity of migraine attacks for at least 2–3 months before your C&P exam. 38 CFR 4.124a, DC 8100 evaluates migraine on prostrating attacks: 50 percent requires very frequent completely prostrating and prolonged attacks productive of severe economic inadaptability, 30 percent characteristic prostrating attacks occurring on an average once a month over the last several months, 10 percent characteristic prostrating attacks averaging one in 2 months over the last several months, and 0 percent less frequent attacks. (capture cfr-4.124a) A neurology nexus letter linking PTSD-related sleep disruption, stress hyperreactivity, and autonomic dysregulation to migraine pathophysiology significantly strengthens the claim.

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STRONG

Medical Rationale

PTSD causes chronic sleep-wake dysregulation through multiple mechanisms that promote sleep-disordered breathing. PTSD-associated nocturnal hyperarousal, fragmented sleep architecture, and REM sleep disruption alter upper airway muscle tone regulation. Elevated cortisol and catecholamines increase sympathetic tone, which causes upper airway muscle hypotonia and reduces the arousal threshold that normally protects against prolonged apneas. Prospective cohort studies consistently show 40–90% prevalence of sleep-disordered breathing in combat PTSD populations, compared to 14–24% in the general male veteran population. Animal studies demonstrate that CRF (corticotropin-releasing factor), chronically elevated in PTSD, directly suppresses hypoglossal motor neurons that maintain gingival/airway muscle tone during sleep.

Key Studies

Mysliwiec V et al. (2013) J Clin Sleep Med (prevalence in combat veterans); Colvonen PJ et al. (2015) J Clin Sleep Med (bidirectional relationship and treatment interaction); Lettieri CJ et al. (2012) J Clin Sleep Med (PTSD as OSA risk factor); Germain A (2013) Sleep Med Rev (sleep disturbances in PTSD).

Filing Tips

Submit your polysomnography (sleep study) report documenting AHI ≥5 (mild), ≥15 (moderate), or ≥30 (severe). Include a nexus letter from your sleep physician or psychiatrist connecting PTSD to OSA via sleep fragmentation and autonomic dysregulation. 38 CFR 4.97, DC 6847 provides 50 percent where the condition requires use of a breathing assistance device such as a CPAP machine. (capture cfr-4.97) Many VA C&P examiners understand this nexus well.

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Orthostatic Hypotension / Syncope

STRONG

Medical Rationale

Prazosin, the first-line alpha-1 adrenergic blocker prescribed for PTSD-related nightmares, produces orthostatic hypotension as a direct pharmacological effect. Alpha-1 blockade reduces peripheral vascular resistance and impairs the compensatory vasoconstriction normally triggered by standing, causing blood pressure drops of 20+ mmHg systolic upon position change. Military-age veterans often tolerate higher doses for nightmare suppression, increasing orthostatic risk. Syncope (fainting) from prazosin-induced hypotension is a documented adverse effect occurring in 1-5% of patients at therapeutic doses. The resulting falls can cause secondary traumatic injuries. Other PTSD medications (trazodone, quetiapine, doxazosin) carry similar orthostatic risk.

Key Studies

Raskind MA et al. (2003) Am J Psychiatry (prazosin for PTSD nightmares, efficacy and side effects); Singh B et al. (2016) Ann Pharmacother (prazosin-related hypotension in PTSD treatment); VA/DoD CPG for PTSD (2023) (medication management guidelines).

Filing Tips

Document prazosin or alpha-blocker prescription for PTSD treatment and dosage history. Blood pressure logs showing orthostatic drops. Emergency room records if syncope occurred. Prescribing psychiatrist nexus letter confirming the medication is for service-connected PTSD and that orthostatic hypotension is a recognized side effect. There is no diagnostic code for hypotension or for syncope: 38 CFR § 4.104 and § 4.124a carry neither as a listing at eCFR issue 2026-08-27. DC 7101 is hypertensive vascular disease and is not the analogous code for the opposite condition. An unlisted condition is rated by analogy under 38 CFR § 4.20 and § 4.27 to a closely related listed condition, and which one VA builds depends on the functions affected in your case, so ask your representative rather than filing under a code chosen here. Document dizziness, near-syncope, and fall risk impact on daily functioning.

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How do I file a secondary service connection claim?

File VA Form 21-526EZ and list the secondary condition as a new claimed disability, noting it is secondary to Posttraumatic stress disorder. Submit a nexus letter at the time of filing — the VA does not request nexus evidence on your behalf. An effective date of Intent to File (VA Form 21-0966) protects your start date for up to 12 months while you gather medical evidence.

Common Questions About Secondary Service Connection

What is a secondary service-connected condition?

A secondary service-connected condition is a disability that is proximately caused or chronically worsened by an already service-connected condition. The VA rates secondary conditions separately and combines them with the primary rating using the combined ratings table under 38 CFR § 4.25.

What legal standard applies to secondary service connection?

38 CFR § 3.310(a) governs secondary service connection. It states: "Disability which is proximately due to or the result of a service-connected disease or injury shall be service connected." Aggravation claims — where the primary condition worsens a pre-existing disability — are covered under § 3.310(b).

Which secondary conditions are most common after Posttraumatic stress disorder?

The 13 secondary conditions documented for Posttraumatic stress disorder vary by evidence strength. The most strongly supported include: Alcohol Use Disorder (Substance Abuse), Erectile Dysfunction, Gastroesophageal Reflux Disease (GERD). Evidence strength reflects the volume and quality of medical literature linking each secondary to the primary condition.

What evidence proves a secondary condition is caused by the primary?

The most reliable evidence is a private nexus letter from a treating physician or independent medical examiner that: (1) acknowledges the service-connected primary condition, (2) diagnoses the secondary condition, and (3) states to at least a 50% probability ("as likely as not") that the primary caused or aggravated the secondary. Treatment records documenting the progression are supporting evidence, not a substitute.

How does the VA rate secondary conditions?

Secondary conditions are rated under the same 38 CFR Part 4 diagnostic codes as any other condition. The VA then combines the primary and all secondary ratings using the combined ratings formula under § 4.25 — not simple addition. For example, a 50% primary and a 30% secondary combine to 65% (rounded to 70%), not 80%.

How do I file a secondary service connection claim?

File VA Form 21-526EZ and list the secondary condition as a new claimed disability, specifically noting it is secondary to your already service-connected primary condition. Submit a nexus letter and all relevant treatment records at the time of filing. If your primary claim is already decided, you can file for the secondary as a new claim at any time — the effective date will be the date of the new claim.

Can I add secondary conditions to an existing claim after it has been decided?

Yes. Secondary conditions can be added at any time as a new claim. The effective date for the secondary will generally be the date VA receives your new claim (or the date of an Intent to File, if filed within the preceding 12 months). If the secondary was improperly denied in an earlier rating decision, a Supplemental Claim or Higher-Level Review may allow an earlier effective date.

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