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  3. G00–G99
  4. G50-G59
  5. Mononeuropathies of lower limb (G57)

Mononeuropathies of lower limb (G57)

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.

  • Diseases of the nervous system (G00–G99)

    • Nerve, nerve root and plexus disorders (G50-G59)

        • Mononeuropathies of lower limb (G57)

        • G57 Mononeuropathies of lower limb
        • G57.0 Lesion of sciatic nerve
        • 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 paresthetica
        • 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 nerve
        • 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 nerve
        • 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 nerve
        • 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 syndrome
        • 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 nerve
        • 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 limb
        • 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 limb
        • 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 limb
        • 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

Instructional Notations

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

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

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)