ICD-10-CM Alphabetic Index · FY 2026 63 Entries
Encephalopathy in the ICD-10-CM Index ICD-10-CM
The main term Encephalopathy (acute) carries 63 index entries pointing to 42 ICD-10-CM codes. The default entry is G93.40, the code the bare main term maps to; every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.
✓ Built from the official CMS FY 2026 index fileEffective Oct 1, 2025 – Sep 30, 2026
63
Index Entries
42
Codes Referenced
G93.40
Default Code
E
Letter
63 of 63 shown
ICD-10-CM
Index Entries Under Encephalopathy 63 entries · 42 codes
Encephalopathy (acute) G93.40
acute necrotizing hemorrhagic G04.30
postimmunization G04.32
postinfectious G04.31
specified NEC G04.39
alcoholic G31.2
anoxic see Damage, brain, anoxic
arteriosclerotic I67.2
centrolobar progressive (Schilder) G37.0
congenital Q07.9
degenerative, in specified disease NEC G32.89
demyelinating callosal G37.1
developmental and epileptic G93.45
due to
drugs G92.8 see also Table of Drugs and Chemicals
early infantile epileptic G93.45
hepatic (without coma) K76.82
hyperbilirubinemic, newborn P57.9
due to isoimmunization (conditions in P55) P57.0
hypertensive I67.4
hypoglycemic E16.2
hypoxic see Damage, brain, anoxic
hypoxic ischemic P91.60
mild P91.61
moderate P91.62
severe P91.63
in (due to) (with)
birth injury P11.1
hyperinsulinism E16.1
influenza see Influenza, with, encephalopathy
lack of vitamin E56.9 see also Deficiency, vitamin
neoplastic disease (see also Neoplasm) D49.9
syphilis A52.17
trauma (postconcussional) F07.81
current injury see Injury, intracranial
vaccination G04.02
lead see Poisoning, lead
metabolic G93.41
drug induced G92.8
toxic G92.8
myoclonic, early, symptomatic see Epilepsy, generalized, specified NEC
necrotizing, subacute (Leigh) G31.82
neonatal P91.819
in diseases classified elsewhere P91.811
pellagrous E52
portal-systemic K76.82
postcontusional F07.81
current injury see Injury, intracranial, diffuse
posthypoglycemic (coma) E16.1
postradiation G93.89
saturnine see Poisoning, lead
septic G93.41
specified NEC G93.49
spongiform, subacute (viral) A81.09
toxic G92.9
metabolic G92.8
traumatic (postconcussional) F07.81
current injury see Injury, intracranial
vitamin B deficiency NEC E53.9
vitamin B1 E51.2
Wernicke's E51.2
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Related Index Terms
Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.
