G93.40 — Encephalopathy, unspecified
G93.40 is a billable, specific ICD-10-CM code for encephalopathy, unspecified. It is valid for submission on a claim.
Other codes that can never be billed with G93.40
These codes carry an Excludes1 note pointing at G93.40. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading G93.40 alone.
- G04Encephalitis, myelitis and encephalomyelitis
Risk adjustment
G93.40 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
G93.40 is named in 6 Medicare coverage policies — 6 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56551Billing and Coding: Visual Fields Testing
- A56612Billing and Coding: CT of the Head
- A56767Billing and Coding: Heavy Metal Testing
- A56767Billing and Coding: Heavy Metal Testing
How G93.40 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to G93.40.
- Encephalopathy(acute)
Related codes at this level
Codes that share G93.4. If G93.40 is not quite right, the correct code is usually one of these.
Questions about G93.40
- Is G93.40 a billable ICD-10-CM code?
- Yes. G93.40 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does G93.40 sit in the tabular list?
- Diseases of the nervous system (G00-G99), in the block Other disorders of the nervous system (G89-G99).