ICD-10-CM
ICD-10 code for Encephalopathy: G93.40
The ICD-10-CM index points "Encephalopathy" to G93.4 (Other and unspecified encephalopathy), a header that is not billable. When nothing more specific is documented, the billable code is G93.40, Encephalopathy, unspecified.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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Index subterms
A header groups codes and is not billed. A billable code is one you can report. Listed second marks a billable manifestation code (its CDC title says it is "classified elsewhere"): code the underlying disease or condition first, then this code.
- G04.30acute necrotizing hemorrhagic, Acute necrotizing hemorrhagic encephalopathy, unspecifiedBillable
- G31.2alcoholic, Degeneration of nervous system due to alcoholBillable
- I67.2arteriosclerotic, Cerebral atherosclerosisBillable
- G37.0centrolobar progressive (Schilder), Diffuse sclerosis of central nervous systemBillable
- Q07.9congenital, Congenital malformation of nervous system, unspecifiedBillable
- G32.89degenerative, in specified disease NEC, Other specified degenerative disorders of nervous system in diseases classified elsewhereListed second
- G37.1demyelinating callosal, Central demyelination of corpus callosumBillable
- G93.45developmental and epileptic, Developmental and epileptic encephalopathyBillable
- G93.45early infantile epileptic, Developmental and epileptic encephalopathyBillable
- K76.82hepatic (without coma), Hepatic encephalopathyBillable
- P57.9hyperbilirubinemic, newborn, Kernicterus, unspecifiedBillable
- I67.4hypertensive, Hypertensive encephalopathyBillable
- E16.2hypoglycemic, Hypoglycemia, unspecifiedBillable
- P91.60hypoxic ischemic, Hypoxic ischemic encephalopathy [HIE], unspecifiedBillable
- G93.41metabolic, Metabolic encephalopathyBillable
- G31.82necrotizing, subacute (Leigh), Leigh's diseaseBillable
- P91.819neonatal, Neonatal encephalopathy, unspecifiedBillable
- E52pellagrous, Niacin deficiency [pellagra], and G32.89 for the manifestationBillable
- K76.82portal-systemic, Hepatic encephalopathyBillable
- F07.81postcontusional, Postconcussional syndromeBillable
- E16.1posthypoglycemic (coma), Other hypoglycemia, and G94 for the manifestationBillable
- G93.89postradiation, Other specified disorders of brainBillable
- G93.41septic, Metabolic encephalopathyBillable
- G93.49specified NEC, Other encephalopathyBillable
- A81.09spongiform, subacute (viral), Other Creutzfeldt-Jakob diseaseBillable
- G92.9toxic, Unspecified toxic encephalopathyBillable
- F07.81traumatic (postconcussional), Postconcussional syndromeBillable
- E53.9vitamin B deficiency NEC, Vitamin B deficiency, unspecified, and G32.89 for the manifestationBillable
- E51.2Wernicke's, Wernicke's encephalopathyBillable
More specific codes in G93
A header groups codes and is not billed. A billable code is one you can report.
- G93Other disorders of brainHeader
- G93.0Cerebral cystsBillable
- G93.1Anoxic brain damage, not elsewhere classifiedBillable
- G93.2Benign intracranial hypertensionBillable
- G93.3Postviral and related fatigue syndromesHeader
- G93.31Postviral fatigue syndromeBillable
- G93.32Myalgic encephalomyelitis/chronic fatigue syndromeBillable
- G93.39Other post infection and related fatigue syndromesBillable
- G93.4Other and unspecified encephalopathyHeader
- G93.40Encephalopathy, unspecifiedBillable
- G93.41Metabolic encephalopathyBillable
- G93.42Megalencephalic leukoencephalopathy with subcortical cystsBillable
- G93.43Leukoencephalopathy with calcifications and cystsBillable
- G93.44Adult-onset leukodystrophy with axonal spheroidsBillable
- G93.45Developmental and epileptic encephalopathyBillable
- G93.49Other encephalopathyBillable
- G93.5Compression of brainBillable
- G93.6Cerebral edemaBillable
- G93.7Reye's syndromeBillable
- G93.8Other specified disorders of brainHeader
- G93.81Temporal sclerosisBillable
- G93.82Brain deathBillable
- G93.89Other specified disorders of brainBillable
- G93.9Disorder of brain, unspecifiedBillable
Excludes2
Excludes2 means the other condition can be reported with this one when both are documented.
From G93.4. A note on a category applies to every code under it.
Related conditions
Related pages
- G93.40 code detailsNotes, nearby codes, CMS-HCC group
- Category G93.4Every code under it
- Chapter 6Diseases of the nervous system
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Encephalopathy?
The ICD-10-CM index points "Encephalopathy" to G93.4 (Other and unspecified encephalopathy), a header that is not billable. When nothing more specific is documented, the billable code is G93.40, Encephalopathy, unspecified.
Is G93.40 billable?
Yes. G93.40 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to G93.40?
The CDC tabular list gives 4 Excludes2 notes (may be coded together when both are documented) for G93.40 and the categories above it. They are listed on this page.
What chapter is G93.40 in?
Chapter 6. Diseases of the nervous system.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.