ICD-10-CM · Chapter 6 · G00-G99
Diseases of the nervous system
700 billable diagnosis codes across 11 code blocks. FY2027 release.
Excludes 2 (not included here)
- 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)
G00-G09 Inflammatory diseases of the central nervous system
- G00 Bacterial meningitis, not elsewhere classified
- G01 Meningitis in bacterial diseases classified elsewhere Billable
- G02 Meningitis in other infectious and parasitic diseases classified elsewhere Billable
- G03 Meningitis due to other and unspecified causes
- G04 Encephalitis, myelitis and encephalomyelitis
- G05 Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere
- G06 Intracranial and intraspinal abscess and granuloma
- G07 Intracranial and intraspinal abscess and granuloma in diseases classified elsewhere Billable
- G08 Intracranial and intraspinal phlebitis and thrombophlebitis Billable
- G09 Sequelae of inflammatory diseases of central nervous system Billable
G10-G14 Systemic atrophies primarily affecting the central nervous system
G20-G26 Extrapyramidal and movement disorders
G30-G32 Other degenerative diseases of the nervous system
G35-G37 Demyelinating diseases of the central nervous system
G40-G47 Episodic and paroxysmal disorders
G50-G59 Nerve, nerve root and plexus disorders
- G50 Disorders of trigeminal nerve
- G51 Facial nerve disorders
- G52 Disorders of other cranial nerves
- G53 Cranial nerve disorders in diseases classified elsewhere Billable
- G54 Nerve root and plexus disorders
- G55 Nerve root and plexus compressions in diseases classified elsewhere Billable
- G56 Mononeuropathies of upper limb
- G57 Mononeuropathies of lower limb
- G58 Other mononeuropathies
- G59 Mononeuropathy in diseases classified elsewhere Billable
G60-G65 Polyneuropathies and other disorders of the peripheral nervous system
G70-G73 Diseases of myoneural junction and muscle
G80-G83 Cerebral palsy and other paralytic syndromes
G89-G99 Other disorders of the nervous system
- G89 Pain, not elsewhere classified
- G90 Disorders of autonomic nervous system
- G91 Hydrocephalus
- G92 Toxic encephalopathy
- G93 Other disorders of brain
- G94 Other disorders of brain in diseases classified elsewhere Billable
- G95 Other and unspecified diseases of spinal cord
- G96 Other disorders of central nervous system
- G97 Intraoperative and postprocedural complications and disorders of nervous system, not elsewhere classified
- G98 Other disorders of nervous system not elsewhere classified
- G99 Other disorders of nervous system in diseases classified elsewhere
Last reviewed: September 2026