ICD-10-CM 2027
ICD-10 code for Pontiac fever
From the official ICD-10-CM alphabetic index entry “Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › Pontiac”. Page updated September 29, 2026.
About coding Pontiac fever
The ICD-10-CM code for Pontiac fever is A48.2 (Nonpneumonic Legionnaires' disease [Pontiac fever]).
Within A48 (other bacterial diseases, not elsewhere classified), A48.2 is specifically for Nonpneumonic Legionnaires' disease [Pontiac fever]. Related codes cover gas gangrene (A48.0), Legionnaires' disease (A48.1), toxic shock syndrome (A48.3), Brazilian purpuric fever (A48.4), other specified botulism (A48.5) and other specified bacterial diseases (A48.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 867 (Other Infectious and Parasitic Diseases Diagnoses with MCC, relative weight 2.1859), DRG 868 (Other Infectious and Parasitic Diseases Diagnoses with CC, relative weight 1.0235) and DRG 869 (Other Infectious and Parasitic Diseases Diagnoses without CC/MCC, relative weight 0.6787), in MDC 18 (Infectious and Parasitic Diseases, Systemic or Unspecified Sites), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about Pontiac fever ICD-10 codes
What is the ICD-10 code for Pontiac fever?
- A48.2 — Nonpneumonic Legionnaires' disease [Pontiac fever].
Is A48.2 billable?
- Yes. A48.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A48.2 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A48.2 as a principal diagnosis.
Is A48.2 a CC or MCC?
- No. A48.2 is neither a CC nor an MCC under MS-DRG v44.0.