B99
B99 — Other and unspecified infectious diseases
Non-billable headerICD-10-CM
B99 is a non-billable header ICD-10-CM code for other and unspecified infectious diseases. It cannot be billed on its own: choose one of the more specific child codes below.
Risk adjustment
B99 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.
How B99 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.
- Arthropathy›postinfectious NEC
- Pneumonia›postinfectional NEC
- Conjunctivitis NOS›in›infectious disease NEC
- Encephalitis›in›infectious disease NEC
- Iridocyclitis›in›infectious disease NOS
- Mastoiditis›in›infectious disease NEC
- Myopathy›in›infectious disease NEC
- Neuritis›acoustic›in›infectious disease NEC
- Otitis›externa›in›infectious disease NEC
- Polyneuropathy›in›infectious›disease NEC
- Palsy›cranial nerve›multiple›in›infectious disease
Code to one of these instead B99
2 child codes. Green means billable.
Questions about B99
- Is B99 a billable ICD-10-CM code?
- No. B99 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does B99 sit in the tabular list?
- Certain infectious and parasitic diseases (A00-B99), in the block Other infectious diseases (B99).