G98.8
Other disorders of nervous system
G98.8 (also written G988) is a billable ICD-10-CM diagnosis code for other disorders of nervous system. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 2 codes in category G98 (Other disorders of nervous system not elsewhere classified). The Alphabetic Index lists it under 5 entries. 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)
- 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)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Home Health Primary
Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the Neuro Rehabilitation clinical group.
Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026Includes
Further defines or gives examples of the content of the category.
- nervous system disorder NOS
Inclusion terms
Conditions classified to this code.
- Nervous system disorder NOS
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 5 entries