Mononeuropathies of lower limb (G57) ICD-10-CM
The G57 code range covers mononeuropathies of lower limb with 51 ICD-10-CM diagnosis codes. 40 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- current traumatic nerve disorder - see nerve injury by body region
Codes in the G57 Range 51 codes · 40 billable
- G57 Mononeuropathies of lower limbNon-billable
- G57.0 Lesion of sciatic nerveNon-billable
- G57.00 Lesion of sciatic nerve, unspecified lower limb
- G57.01 Lesion of sciatic nerve, right lower limb
- G57.02 Lesion of sciatic nerve, left lower limb
- G57.03 Lesion of sciatic nerve, bilateral lower limbs
- G57.1 Meralgia parestheticaNon-billable
- G57.10 Meralgia paresthetica, unspecified lower limb
- G57.11 Meralgia paresthetica, right lower limb
- G57.12 Meralgia paresthetica, left lower limb
- G57.13 Meralgia paresthetica, bilateral lower limbs
- G57.2 Lesion of femoral nerveNon-billable
- G57.20 Lesion of femoral nerve, unspecified lower limb
- G57.21 Lesion of femoral nerve, right lower limb
- G57.22 Lesion of femoral nerve, left lower limb
- G57.23 Lesion of femoral nerve, bilateral lower limbs
- G57.3 Lesion of lateral popliteal nerveNon-billable
- G57.30 Lesion of lateral popliteal nerve, unspecified lower limb
- G57.31 Lesion of lateral popliteal nerve, right lower limb
- G57.32 Lesion of lateral popliteal nerve, left lower limb
- G57.33 Lesion of lateral popliteal nerve, bilateral lower limbs
- G57.4 Lesion of medial popliteal nerveNon-billable
- G57.40 Lesion of medial popliteal nerve, unspecified lower limb
- G57.41 Lesion of medial popliteal nerve, right lower limb
- G57.42 Lesion of medial popliteal nerve, left lower limb
- G57.43 Lesion of medial popliteal nerve, bilateral lower limbs
- G57.5 Tarsal tunnel syndromeNon-billable
- G57.50 Tarsal tunnel syndrome, unspecified lower limb
- G57.51 Tarsal tunnel syndrome, right lower limb
- G57.52 Tarsal tunnel syndrome, left lower limb
- G57.53 Tarsal tunnel syndrome, bilateral lower limbs
- G57.6 Lesion of plantar nerveNon-billable
- G57.60 Lesion of plantar nerve, unspecified lower limb
- G57.61 Lesion of plantar nerve, right lower limb
- G57.62 Lesion of plantar nerve, left lower limb
- G57.63 Lesion of plantar nerve, bilateral lower limbs
- G57.7 Causalgia of lower limbNon-billable
- G57.70 Causalgia of unspecified lower limb
- G57.71 Causalgia of right lower limb
- G57.72 Causalgia of left lower limb
- G57.73 Causalgia of bilateral lower limbs
- G57.8 Other specified mononeuropathies of lower limbNon-billable
- G57.80 Other specified mononeuropathies of unspecified lower limb
- G57.81 Other specified mononeuropathies of right lower limb
- G57.82 Other specified mononeuropathies of left lower limb
- G57.83 Other specified mononeuropathies of bilateral lower limbs
- G57.9 Unspecified mononeuropathy of lower limbNon-billable
- G57.90 Unspecified mononeuropathy of unspecified lower limb
- G57.91 Unspecified mononeuropathy of right lower limb
- G57.92 Unspecified mononeuropathy of left lower limb
- G57.93 Unspecified mononeuropathy of bilateral lower limbs
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the G57 range.
Femoral Neuropathy
Disease involving the femoral nerve. The femoral nerve may be injured by ISCHEMIA (e.g., in association with DIABETIC NEUROPATHIES), nerve compression, trauma, COLLAGEN DISEASES, and other disease processes. Clinical features include MUSCLE WEAKNESS or PARALYSIS of hip flexion and knee extension, ATROPHY of the QUADRICEPS MUSCLE, reduced or absent patellar reflex, and impaired sensation over the anterior and medial thigh.
Sciatic Neuropathy
Disease or damage involving the SCIATIC NERVE, which divides into the PERONEAL NERVE and TIBIAL NERVE (see also PERONEAL NEUROPATHIES and TIBIAL NEUROPATHY). Clinical manifestations may include SCIATICA or pain localized to the hip, PARESIS or PARALYSIS of posterior thigh muscles and muscles innervated by the peroneal and tibial nerves, and sensory loss involving the lateral and posterior thigh, posterior and lateral leg, and sole of the foot. The sciatic nerve may be affected by trauma; ISCHEMIA; COLLAGEN DISEASES; and other conditions. (From Adams et al., Principles of Neurology, 6th ed, p1363)
Tarsal Tunnel Syndrome
Entrapment of the distal branches of the posterior TIBIAL NERVE (which divides into the medial plantar, lateral plantar, and calcanial nerves) in the tarsal tunnel, which lies posterior to the internal malleolus and beneath the retinaculum of the flexor muscles of the foot. Symptoms include ankle pain radiating into the foot which tends to be aggravated by walking. Examination may reveal Tinel's sign (radiating pain following nerve percussion) over the tibial nerve at the ankle, weakness and atrophy of the small foot muscles, or loss of sensation in the foot. (From Foot Ankle 1990;11(1):47-52)
Tibial Nerve
The medial terminal branch of the sciatic nerve. The tibial nerve fibers originate in lumbar and sacral spinal segments (L4 to S2). They supply motor and sensory innervation to parts of the calf and foot.
Tibial Neuropathy
Disease of the TIBIAL NERVE (also referred to as the posterior tibial nerve). The most commonly associated condition is the TARSAL TUNNEL SYNDROME. However, LEG INJURIES; ISCHEMIA; and inflammatory conditions (e.g., COLLAGEN DISEASES) may also affect the nerve. Clinical features include PARALYSIS of plantar flexion, ankle inversion and toe flexion as well as loss of sensation over the sole of the foot. (From Joynt, Clinical Neurology, 1995, Ch51, p32)
About the G57 Code Range
ICD-10 code G57 designates mononeuropathies of the lower limb, covering various nerve lesions that affect movement and sensation in the legs. This includes conditions such as sciatic nerve injury, meralgia paresthetica, femoral nerve damage, and tarsal tunnel syndrome, among others.
These codes, such as G57.00 for unspecified sciatic nerve lesions (including piriformis syndrome and sciatic nerve compression), or G57.10 for meralgia paresthetica involving the lateral cutaneous nerve of the thigh, provide precise classification for nerve impairments specific to one or both lower limbs. The code set also addresses lesions of the femoral nerve (G57.20), lateral popliteal nerve (commonly known as common peroneal neuropathy, e.g., G57.30), medial popliteal or tibial nerve (G57.40), plantar nerve (G57.60), and tarsal tunnel syndrome (G57.50). Specialized terms like complex regional pain syndrome type II (causalgia, G57.70) and other specified mononeuropathies (including sural, saphenous, or obturator nerve involvement, e.g., G57.80) are also included. These codes support accurate diagnosis and treatment documentation for nerve-related lower limb disorders in medical coding and health records.
Questions About This Page
How many billable codes are in the G57 range?
Of the 51 codes in this range, 40 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the G57 range classify?
The range classifies mononeuropathies of lower limb. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
