B99.9 — Unspecified infectious disease
B99.9 is a billable, specific ICD-10-CM code for unspecified infectious disease. It is valid for submission on a claim.
Risk adjustment
B99.9 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
B99.9 is named in 4 Medicare coverage policies — 4 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A58710Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing
- A58720Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing
- A58747Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing
- A58761Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing
How B99.9 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 B99.9.
- Infection, infected, infective(opportunistic)
- Disease, diseased›epidemic
- Disease, diseased›infectious, infective
- Fever›infective
- Granuloma›infectious
Related codes at this level
Codes that share B99. If B99.9 is not quite right, the correct code is usually one of these.
Questions about B99.9
- Is B99.9 a billable ICD-10-CM code?
- Yes. B99.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does B99.9 sit in the tabular list?
- Certain infectious and parasitic diseases (A00-B99), in the block Other infectious diseases (B99).