A21.0 ICD-10-CM Code: Ulceroglandular tularemia

A21.0 is the ICD-10-CM diagnosis code for ulceroglandular tularemia. Ulceroglandular tularemia is a bacterial infection caused by Francisella tularensis that produces painful ulcers on the skin and swollen lymph nodes, typically acquired through contact with infected animals or contaminated water. It is the most common form of tularemia and can be treated with antibiotics if diagnosed early. A21.0 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering certain zoonotic bacterial diseases (a20-a28).

A21.0 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

Verify that the documentation specifically identifies ulceroglandular tularemia rather than other forms (typhoidal, pneumonic, oculoglandular, etc.), as each has a distinct ICD-10-CM code.