G00-G99
Diseases of the nervous system
Chapter coding notes
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)
Blocks in this chapter
G00-G09
Inflammatory diseases of the central nervous system
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
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
Official Guidelines for Chapter 6
FY 2026 ›Sections that reference codes in Chapter 6
- I.A.12.aExcludes1G47.63General rules
- I.A.13Etiology/manifestation convention (“code first”, “use additional code” and “in diseases classified elsewhere” notes)G20General rules
- I.C.5.aPain disorders related to psychological factorsG89Chapter 5 guidance
- I.C.6.aDominant/nondominant sideG81
- I.C.6.b.1)General coding informationG89
- I.C.6.b.1)(a)Category G89 Codes as Principal or First-Listed DiagnosisG89
- I.C.6.b.1)(b)(i)Assigning Category G89 and Site-Specific Pain CodesG89
- I.C.6.b.3)(a)Postoperative pain not associated with specific postoperative complicationG89
Showing 8 of 13 sections that reference this range. Browse all FY 2026 guidelines.