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ICD-10-CM chapter 6 · G00-G99

Diseases of the nervous system

About chapter 6

Chapter 6 (G00-G99) contains 68 categories and 700 billable codes for FY2027. No codes here changed in the FY2027 update. 53 codes are MCCs and 218 are CCs when reported as secondary diagnoses.

11 code blocks

Chapter notes

Excludes2
  • 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)