ICD-10-CM 2027
ICD-10 code for solar fever
From the official ICD-10-CM alphabetic index entry “Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › solar”. Page updated September 29, 2026.
About coding solar fever
The ICD-10-CM code for solar fever is A90 (Dengue fever [classical dengue]).
Don't report A90 together with the conditions in its Excludes1 note: dengue hemorrhagic fever (A91).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 865 (Viral Illness with MCC, relative weight 1.3485) and DRG 866 (Viral Illness without MCC, relative weight 0.8692), 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.
Don't confuse with (Excludes1 for A90)
- dengue hemorrhagic fever (A91)
Common questions about solar fever ICD-10 codes
What is the ICD-10 code for solar fever?
- A90 — Dengue fever [classical dengue].
Is A90 billable?
- Yes. A90 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A90 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A90 as a principal diagnosis.
Is A90 a CC or MCC?
- A90 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.