ICD-10 Code for Legionellosis
The ICD-10-CM code for legionellosis is A48.1 — Legionnaires' disease. This is the code the Alphabetic Index gives for legionellosis with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
Billable
Which legionellosis code should you use?
The Alphabetic Index lists 2 codes under Legionellosis. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| nonpneumonic | A48.2 | Nonpneumonic Legionnaires' disease [Pontiac fever] |
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources