Excludes1 pair
G91.4 vs G94
G91.4 and G94 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.
The official note, declared on G94
hydrocephalus in diseases classified elsewhere (G91.4)
G91.4
Hydrocephalus in diseases classified elsewhere
Billable
- Chapter 6
- Diseases of the nervous system
- Section
- G89-G99
Indexed under
- Hydrocephalus › secondary
- Hydrocephalus › in › infectious disease NEC
- Hydrocephalus › in › neoplastic disease NEC (see also Neoplasm)
- Hydrocephalus › in › parasitic disease
G94
Other disorders of brain in diseases classified elsewhere
Billable
- Chapter 6
- Diseases of the nervous system
- Section
- G89-G99
Indexed under
- Encephalopathy › posthypoglycemic (coma)
- Epilepsy, epileptic, epilepsia › parasitic NOS
- Malaria, malarial › cerebral
- Typhus › brain
- Typhus › cerebral
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027