G93.40 Encephalopathy, unspecified

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from G93.4 Other and unspecified encephalopathy

Excludes2 (not included here)

• alcoholic encephalopathy (G31.2)
• encephalopathy in diseases classified elsewhere (G94)
• hypertensive encephalopathy (I67.4)
• toxic (metabolic) encephalopathy (G92.8)

MS-DRG index

Defines the logic of DRG(s) 070-072 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 348.30 Encephalopathy, unspecified

Code annotations containing back-references to G93.40

Back-references to G93.40

• Type 1 Excludes: G04 Encephalitis, myelitis and encephalomyelitis ("encephalopathy NOS (G93.40)")

Back-references to G93.4

• Code Also: F78.A1 SYNGAP1-related intellectual disability ("encephalopathy (G93.4-)")

Diagnosis Index entries for G93.40

• Encephalopathy (acute)

Nearby codes

• G93.3 Postviral and related fatigue syndromes
• G93.31 Postviral fatigue syndrome
• G93.32 Myalgic encephalomyelitis/chronic fatigue syndrome
• G93.39 Other post infection and related fatigue syndromes
• G93.4 Other and unspecified encephalopathy
• G93.40 Encephalopathy, unspecified (this code)
• G93.41 Metabolic encephalopathy
• G93.42 Megalencephalic leukoencephalopathy with subcortical cysts
• G93.43 Leukoencephalopathy with calcifications and cysts
• G93.44 Adult-onset leukodystrophy with axonal spheroids
• G93.45 Developmental and epileptic encephalopathy