A27Header code — not billable

Leptospirosis

Chapter
1. Certain infectious and parasitic diseases
Category
A27
Effective date
October 1, 2026

Related codes in category A27

A27.0Leptospirosis icterohemorrhagicaYesA27.8Other forms of leptospirosisA27.81Aseptic meningitis in leptospirosisYesA27.89Other forms of leptospirosisYesA27.9Leptospirosis, unspecifiedYes

Frequently asked questions

What is ICD-10 code A27?

A27 is an ICD-10-CM diagnosis code for Leptospirosis.

Is A27 a billable code?

No. A27 is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is A27 in?

A27 falls under Chapter 1: Certain infectious and parasitic diseases.

When did A27 become effective?

A27 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to A27?

A27 belongs to category A27, which includes 5 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.