G99
Other disorders of nervous system in diseases classified elsewhere
Non-billable headerNot valid on its own. Use one of the more specific codes under it.
G99 is a non-billable ICD-10-CM code category for other disorders of nervous system in diseases classified elsewhere. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are G99.0 Autonomic neuropathy in diseases classified elsewhere, G99.2 Myelopathy in diseases classified elsewhere and G99.8 Other specified disorders of nervous system in diseases classified elsewhere. Its coding notes include 8 Excludes2 entries.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (8 notes)
Inherited from Chapter 6 Diseases of the nervous system
- 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)