Group XIII.Extension of hip and flexion of knee; outward and inward rotation of flexed knee; acting with rectus femoris and sartorius (see XIV, 1, 2) synchronizing simultaneous flexion of hip and knee and extension of hip and knee by belt-over-pulley action at knee joint.(1) Biceps femoris; (2) semimembranosus; (3) semitendinosus Function: Posterior thigh group, Hamstring complex of 2-joint muscles

The VA rates Group XIII.Extension of hip and flexion of knee; outward and inward rotation of flexed knee; acting with rectus femoris and sartorius (see XIV, 1, 2) synchronizing simultaneous flexion of hip and knee and extension of hip and knee by belt-over-pulley action at knee joint.(1) Biceps femoris; (2) semimembranosus; (3) semitendinosus Function: Posterior thigh group, Hamstring complex of 2-joint muscles under Diagnostic Code 5313 at 0%, 10%, 30%, 40%. The minimum 0% rating requires: Slight. The maximum 40% rating requires: Severe.

The VA rates Group XIII.Extension of hip and flexion of knee; outward and inward rotation of flexed knee; acting with rectus femoris and sartorius (see XIV, 1, 2) synchronizing simultaneous flexion of hip and knee and extension of hip and knee by belt-over-pulley action at knee joint.(1) Biceps femoris; (2) semimembranosus; (3) semitendinosus Function: Posterior thigh group, Hamstring complex of 2-joint muscles under Diagnostic Code (DC) 5313, governed by 38 CFR 38 CFR § 4.73. The diagnostic code establishes the specific rating tiers and severity criteria the VA examiner applies.

A 0% rating requires: Slight. A 40% rating requires: Severe. The difference typically reflects the frequency, severity, or functional impact of the condition as documented in medical records and C&P examination findings.

Veterans rated for Group XIII.Extension of hip and flexion of knee; outward and inward rotation of flexed knee; acting with rectus femoris and sartorius (see XIV, 1, 2) synchronizing simultaneous flexion of hip and knee and extension of hip and knee by belt-over-pulley action at knee joint.(1) Biceps femoris; (2) semimembranosus; (3) semitendinosus Function: Posterior thigh group, Hamstring complex of 2-joint muscles may qualify for TDIU if the condition — alone or in combination with other service-connected disabilities — prevents substantially gainful employment. A single disability rated at 60% or higher (or multiple disabilities combining to 70%, with one at 40%) can support a TDIU claim under 38 CFR § 4.16.

Service connection for Group XIII.Extension of hip and flexion of knee; outward and inward rotation of flexed knee; acting with rectus femoris and sartorius (see XIV, 1, 2) synchronizing simultaneous flexion of hip and knee and extension of hip and knee by belt-over-pulley action at knee joint.(1) Biceps femoris; (2) semimembranosus; (3) semitendinosus Function: Posterior thigh group, Hamstring complex of 2-joint muscles requires three elements: (1) a current diagnosis of the condition, (2) an in-service event, injury, or disease, and (3) a medical nexus linking the current diagnosis to that in-service occurrence. A nexus letter from a treating or independent medical examiner is the most reliable nexus evidence.

A Compensation & Pension (C&P) exam for Group XIII.Extension of hip and flexion of knee; outward and inward rotation of flexed knee; acting with rectus femoris and sartorius (see XIV, 1, 2) synchronizing simultaneous flexion of hip and knee and extension of hip and knee by belt-over-pulley action at knee joint.(1) Biceps femoris; (2) semimembranosus; (3) semitendinosus Function: Posterior thigh group, Hamstring complex of 2-joint muscles uses a Disability Benefits Questionnaire (DBQ) specific to the body system involved. The examiner documents the frequency, severity, and functional impact of your symptoms. Bring all relevant treatment records and be prepared to describe your worst-day symptoms — the examiner rates your condition based on the full clinical picture, not a single visit.