B25.9 — Cytomegaloviral disease, unspecified
B25.9 is a billable, specific ICD-10-CM code for cytomegaloviral disease, unspecified. It is valid for submission on a claim.
Other codes that can never be billed with B25.9
These codes carry an Excludes1 note pointing at B25.9. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading B25.9 alone.
- B34Viral infection of unspecified site
Risk adjustment
B25.9 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 6 Opportunistic Infections0.381 RAF
Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.
Medicare coverage
B25.9 is named in 5 Medicare coverage policies — 5 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A53060Billing and Coding: Ophthalmology: Extended Ophthalmoscopy and Fundus Photography
- A56612Billing and Coding: CT of the Head
- A56718Billing and Coding: Intravenous Immunoglobulin (IVIG)
- A59105Billing and Coding: Off-Label Use of Intravenous Immune Globulin (IVIG)
How B25.9 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 B25.9.
- Cytomegalovirus infection
- Disease, diseased›cytomegalic inclusion(generalized)
- Disease, diseased›cytomegaloviral
- Disease, diseased›inclusion
- Infection, infected, infective›cytomegalovirus, cytomegaloviral
- Virus, viral›cytomegalovirus
- Disease, diseased›inclusion›salivary gland
- Disease, diseased›salivary gland or duct›inclusion
- Disease, diseased›salivary gland or duct›virus
Related codes at this level
Codes that share B25. If B25.9 is not quite right, the correct code is usually one of these.
Questions about B25.9
- Is B25.9 a billable ICD-10-CM code?
- Yes. B25.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does B25.9 sit in the tabular list?
- Certain infectious and parasitic diseases (A00-B99), in the block Other viral diseases (B25-B34).