ICD-10 code for Rickettsialpox

The ICD-10-CM code for Rickettsialpox is A79.1 (Rickettsialpox due to Rickettsia akari).

Within A79 (other rickettsioses), A79.1 is specifically for Rickettsialpox due to Rickettsia akari. Related codes cover Trench fever (A79.0), other specified rickettsioses (A79.8) and rickettsiosis, unspecified (A79.9).

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 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.