A80-A89 — Viral and prion infections of the central nervous system
ICD-10-CM codes A80-A89 cover viral and prion infections of the central nervous system, within certain infectious and parasitic diseases. The block holds 60 codes across 10 categories, of which 48 are billable and 12 are header codes that cannot be submitted on a claim.
Risk adjustment in A80-A89
0 codes in this block map to a CMS-HCC, which means the diagnosis carries a risk-adjustment payment when it is documented and coded. Under-coding here is money left on the table; over-coding here is what audits are for.
- HCC 127 Dementia, Mild or Unspecified
What else to watch in A80-A89
- 48 codes are named in Medicare coverage policies. An LCD or NCD lists them as supporting medical necessity, or explicitly as not supporting it. Which applies depends on the MAC for your state.
Categories in A80-A89
- A80Acute poliomyelitis
- A81Atypical virus infections of central nervous system
- A82Rabies
- A83Mosquito-borne viral encephalitis
- A84Tick-borne viral encephalitis
- A85Other viral encephalitis, not elsewhere classified
- A86Unspecified viral encephalitis
- A87Viral meningitis
- A88Other viral infections of central nervous system, not elsewhere classified
- A89Unspecified viral infection of central nervous system