ICD-10-CM 2027
ICD-10 code for Anaplasmosis [A. phagocytophilum]
From the official ICD-10-CM alphabetic index entry “Anaplasmosis [A. phagocytophilum] (transfusion transmitted)”. Page updated September 29, 2026.
About coding Anaplasmosis [A. phagocytophilum]
The ICD-10-CM code for Anaplasmosis [A. phagocytophilum] is A79.82 (Anaplasmosis [A. phagocytophilum]). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on A79.82.
Within A79.8 (other specified rickettsioses), A79.82 is specifically for Anaplasmosis [A. phagocytophilum]. Related codes cover rickettsiosis due to Ehrlichia sennetsu (A79.81) and other specified rickettsioses (A79.89).
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.
More specific Anaplasmosis [A. phagocytophilum] codes (official index)
- human A77.49 — Other ehrlichiosis
Common questions about Anaplasmosis [A. phagocytophilum] ICD-10 codes
What is the ICD-10 code for Anaplasmosis [A. phagocytophilum]?
- A79.82 — Anaplasmosis [A. phagocytophilum]. More specific codes apply when the documentation supports them: A77.49.
What is the ICD-10 code for human anaplasmosis [a. phagocytophilum]?
- A77.49 — Other ehrlichiosis.
Is A79.82 billable?
- Yes. A79.82 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A79.82 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A79.82 as a principal diagnosis.
Is A79.82 a CC or MCC?
- A79.82 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.