A20-A28 — Certain zoonotic bacterial diseases
ICD-10-CM codes A20-A28 cover certain zoonotic bacterial diseases, within certain infectious and parasitic diseases. The block holds 57 codes across 9 categories, of which 47 are billable and 10 are header codes that cannot be submitted on a claim.
Risk adjustment in A20-A28
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 2 Septicemia, Sepsis, Systemic Inflammatory Response Syndrome/Shock
What else to watch in A20-A28
- 8 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.