A93.2Colorado tick fever

A93.2 is the ICD-10-CM diagnosis code for Colorado tick fever. It belongs to category A93 (other arthropod-borne viral fevers, not elsewhere classified), block A90-A99 (arthropod-borne viral fevers and viral hemorrhagic fevers) and chapter 1 (certain infectious and parasitic diseases). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within A93 (other arthropod-borne viral fevers, not elsewhere classified), A93.2 is specifically for Colorado tick fever. Related codes cover Oropouche virus disease (A93.0), Sandfly fever (A93.1) and other specified arthropod-borne viral fevers (A93.8).

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.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 066.1 (tick-borne fever).