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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  • G50.9—

    Disorder of trigeminal nerve, unspecified

  • G51—

    Facial nerve disorders

  • G51.0—

    Bell's palsy

  • G51.1—

    Geniculate ganglionitis

  • G51.2—

    Melkersson's syndrome

  • G51.3—

    Clonic hemifacial spasm

  • G51.31—

    Clonic hemifacial spasm, right

  • G51.32—

    Clonic hemifacial spasm, left

  • G51.33—

    Clonic hemifacial spasm, bilateral

  • G51.39—

    Clonic hemifacial spasm, unspecified

  • G51.4—

    Facial myokymia

  • G51.8—

    Other disorders of facial nerve

  • G51.9—

    Disorder of facial nerve, unspecified

  • G52—

    Disorders of other cranial nerves

  • G52.0—

    Disorders of olfactory nerve

  • G52.1—

    Disorders of glossopharyngeal nerve

  • G52.2—

    Disorders of vagus nerve

  • G52.3—

    Disorders of hypoglossal nerve

  • G52.7—

    Disorders of multiple cranial nerves

  • G52.8—

    Disorders of other specified cranial nerves

  • G52.9—

    Cranial nerve disorder, unspecified

  • G53—

    Cranial nerve disorders in diseases classified elsewhere

  • G54—

    Nerve root and plexus disorders

  • G54.0—

    Brachial plexus disorders

  • G54.1—

    Lumbosacral plexus disorders

  • G54.2—

    Cervical root disorders, not elsewhere classified

  • G54.3—

    Thoracic root disorders, not elsewhere classified

  • G54.4—

    Lumbosacral root disorders, not elsewhere classified

  • G54.5—

    Neuralgic amyotrophy

  • G54.6—

    Phantom limb syndrome with pain

  • G54.7—

    Phantom limb syndrome without pain

  • G54.8—

    Other nerve root and plexus disorders

  • G54.9—

    Nerve root and plexus disorder, unspecified

  • G55—

    Nerve root and plexus compressions in diseases classified elsewhere

  • G56—

    Mononeuropathies of upper limb

  • G56.0—

    Carpal tunnel syndrome

  • G56.00—

    Carpal tunnel syndrome, unspecified upper limb

  • G56.01—

    Carpal tunnel syndrome, right upper limb

  • G56.02—

    Carpal tunnel syndrome, left upper limb

  • G56.03—

    Carpal tunnel syndrome, bilateral upper limbs

  • G56.1—

    Other lesions of median nerve

  • G56.10—

    Other lesions of median nerve, unspecified upper limb

  • G56.11—

    Other lesions of median nerve, right upper limb

  • G56.12—

    Other lesions of median nerve, left upper limb

  • G56.13—

    Other lesions of median nerve, bilateral upper limbs

  • G56.2—

    Lesion of ulnar nerve

  • G56.20—

    Lesion of ulnar nerve, unspecified upper limb

  • G56.21—

    Lesion of ulnar nerve, right upper limb

  • G56.22—

    Lesion of ulnar nerve, left upper limb

  • G56.23—

    Lesion of ulnar nerve, bilateral upper limbs

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