A21 – Tularemia
ICD-10-CM 2027 diagnosis code · Certain zoonotic bacterial diseases
ICD-10-CM code
A21
- Code
A21(claims format:A21)- Description
- Tularemia
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 1. Certain infectious and parasitic diseases (A00-B99)
- Block
- A20-A28 Certain zoonotic bacterial diseases
Billable codes under A21
A21 is a header code and cannot be used on claims. Choose the most specific code:
- A21.0 – Ulceroglandular tularemiaBillable
- A21.1 – Oculoglandular tularemiaBillable
- A21.2 – Pulmonary tularemiaBillable
- A21.3 – Gastrointestinal tularemiaBillable
- A21.7 – Generalized tularemiaBillable
- A21.8 – Other forms of tularemiaBillable
- A21.9 – Tularemia, unspecifiedBillable
Notes for A21
Includes:
- deer-fly fever
- infection due to Francisella tularensis
- rabbit fever
Frequently asked questions
What is ICD-10 code A21?
A21 is the ICD-10-CM code for tularemia, in the block A20-A28 (Certain zoonotic bacterial diseases).
Is A21 a billable code?
No. A21 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.