G94 Other disorders of brain in diseases classified elsewhere

Billable ICD-10-CM code, FY2026.

Excludes1 (never code together)

• encephalopathy in congenital syphilis (A50.49)
• encephalopathy in influenza (J09.X9, J10.81, J11.81)
• encephalopathy in syphilis (A52.19)
• hydrocephalus in diseases classified elsewhere (G91.4)

Code first

• underlying disease

Applies from G94 Other disorders of brain in diseases classified elsewhere

Excludes1 (never code together)

• encephalopathy in congenital syphilis (A50.49)
• encephalopathy in influenza (J09.X9, J10.81, J11.81)
• encephalopathy in syphilis (A52.19)
• hydrocephalus in diseases classified elsewhere (G91.4)

Code first

• underlying disease

MS-DRG index

Defines the logic of DRG(s) 056-057 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 331.7 Cerebral degeneration in diseases classified elsewhere (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Manifestation codes as principal diagnosis: Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and are not allowed as principal diagnosis.

Code annotations containing back-references to G94

Back-references to G94

• Type 2 Excludes: G93.4 Other and unspecified encephalopathy ("encephalopathy in diseases classified elsewhere (G94)")

Back-references to G94

• Type 2 Excludes: G93.4 Other and unspecified encephalopathy ("encephalopathy in diseases classified elsewhere (G94)")

Diagnosis Index entries for G94

• Cyst (colloid) (mucous) (simple) (retention) › brain (acquired) › hydatid
• Cyst (colloid) (mucous) (simple) (retention) › hydatid › brain
• Disease, diseased › brain › parasitic NEC
• Disease, diseased › parasitic › cerebral NEC
• Encephalopathy (acute) › in (due to) (with) › hyperinsulinism
• Encephalopathy (acute) › posthypoglycemic (coma)
• Epilepsy, epileptic, epilepsia (attack) (cerebral) (convulsion) (fit) (seizure) › parasitic NOS
• Hyperinsulinism (functional) › with › encephalopathy
• Malaria, malarial (fever) › cerebral
• Malaria, malarial (fever) › falciparum › with complications NEC › cerebral
• Typhus (fever) › brain
• Typhus (fever) › cerebral

Nearby codes

• G94 Other disorders of brain in diseases classified elsewhere (this code)