ICD-10 Code G57.21 – Lesion of femoral nerve, right lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G57.21 – Lesion of femoral nerve, right lower limb
What it is
G57.21 identifies a disorder of the femoral nerve affecting the right lower limb. Use it when documentation states femoral nerve injury, lesion, or neuropathy on the right side.
Clinical signs
Typical findings may include weakness of hip flexion or knee extension, reduced patellar reflex, and sensory changes over the anterior thigh or medial leg. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents a right femoral nerve lesion, compression, or neuropathy with laterality specified. It also fits postoperative, traumatic, or compressive nerve involvement if the record names the femoral nerve.
If the note only says lower-extremity neuropathy without naming the femoral nerve, check documentation before assigning G57.21. You should code the documented nerve site and side, not a general pain or weakness complaint.
Do not use for
Do not use this code for left-sided or unspecified femoral nerve lesions, or for femoral artery problems. Do not apply it when the record describes a different nerve or a nonspecific mononeuropathy.
Coding tip
Confirm laterality and the exact nerve named in the assessment before coding.