A27 – Leptospirosis
ICD-10-CM 2027 diagnosis code · Certain zoonotic bacterial diseases
ICD-10-CM code
A27
- Code
A27(claims format:A27)- Description
- Leptospirosis
- 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 A27
A27 is a header code and cannot be used on claims. Choose the most specific code:
- A27.0 – Leptospirosis icterohemorrhagicaBillable
- A27.8 – Other forms of leptospirosisHeader (more codes below)
- A27.9 – Leptospirosis, unspecifiedBillable
Frequently asked questions
What is ICD-10 code A27?
A27 is the ICD-10-CM code for leptospirosis, in the block A20-A28 (Certain zoonotic bacterial diseases).
Is A27 a billable code?
No. A27 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.