All ICD10 Codes
Chapter 6

G00–G99: Diseases of the Nervous System

Diseases of the Nervous System diagnostic classification updated for 2026.

Chapter Instructions

Excludes2(Not included here. Code separately if applicable.)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
All CodesBillable Only
Internal Codes
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  • G56.3—

    Lesion of radial nerve

  • G56.30—

    Lesion of radial nerve, unspecified upper limb

  • G56.31—

    Lesion of radial nerve, right upper limb

  • G56.32—

    Lesion of radial nerve, left upper limb

  • G56.33—

    Lesion of radial nerve, bilateral upper limbs

  • G56.4—

    Causalgia of upper limb

  • G56.40—

    Causalgia of unspecified upper limb

  • G56.41—

    Causalgia of right upper limb

  • G56.42—

    Causalgia of left upper limb

  • G56.43—

    Causalgia of bilateral upper limbs

  • G56.8—

    Other specified mononeuropathies of upper limb

  • G56.80—

    Other specified mononeuropathies of unspecified upper limb

  • G56.81—

    Other specified mononeuropathies of right upper limb

  • G56.82—

    Other specified mononeuropathies of left upper limb

  • G56.83—

    Other specified mononeuropathies of bilateral upper limbs

  • G56.9—

    Unspecified mononeuropathy of upper limb

  • G56.90—

    Unspecified mononeuropathy of unspecified upper limb

  • G56.91—

    Unspecified mononeuropathy of right upper limb

  • G56.92—

    Unspecified mononeuropathy of left upper limb

  • G56.93—

    Unspecified mononeuropathy of bilateral upper limbs

  • 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

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