G99.8

Other specified disorders of nervous system in diseases classified elsewhere

Billable code

This code does not map to a risk-adjusting HCC in the loaded models.

Coding notes

Excludes 1 never coded together · Excludes 2 may co-exist

This code · G99.8
Excludes 1

nervous system involvement in: cysticercosis (B69.0) rubella (B06.0-) syphilis (A52.1-)

Code first

underlying disorder, such as: amyloidosis (E85.-) avitaminosis (E56.-)

Inherited from chapter 6Diseases of the nervous system
Excludes 2

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)

Official Guidelines for G99.8

FY 2026 ›