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A48.1

Legionnaires' disease

Billable FY2026 2025-10-01 → 2026-09-30
Exclusions 6 never code together
A48code
Excludes1
  • actinomycetoma (B47.1)B47.1
A00-B99chapter
Excludes1
  • certain localized infections - see body system-related chapters
Excludes2
  • carrier or suspected carrier of infectious disease (Z22.-)Z22.-
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)O98.-
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)P35-P39
  • influenza and other acute respiratory infections (J00-J22)J00-J22

Excludes1 — never code together. The excluded condition and this one are mutually exclusive.

Excludes2 — not included here, but the patient may have both. Code both when documented.

Instructional notes 2
A00-B99chapter
Includes
  • diseases generally recognized as communicable or transmissible
Use additional code
  • code to identify resistance to antimicrobial drugs (Z16.-)Z16.-
Index entries leading here 4
  • Legionnaires'
  • Disease, diseased — see also Syndrome
  • Infection, infected, infective (opportunistic) B99.9
    • Legionella pneumophila A48.1
  • Legionellosis A48.1
Alongside this code 6 same parent — A48
A48.0 Gas gangrene A48.2 Nonpneumonic Legionnaires' disease [Pontiac fever] A48.3 Toxic shock syndrome A48.4 Brazilian purpuric fever A48.5 Other specified botulism category A48.8 Other specified bacterial diseases
Additional references
AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Risk adjustment

CMS22HCC114 CMS28HCC282 ESRD21HCC114 ESRD24HCC114

Presence is a property of the code. Untick a model to hide it everywhere.

This code

Billable
yes
Code set
FY2026
Parent
A48
Block
A30-A49
Siblings
6

Present FY2024–FY2027.