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ICD-10-CM 2027 diagnosis code

A79.8Other specified rickettsioses

Not billable — use a more specific code

A79.8 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About A79.8

A79.8 is the ICD-10-CM diagnosis code for other specified rickettsioses. It belongs to category A79 (other rickettsioses), block A75-A79 (rickettsioses) and chapter 1 (certain infectious and parasitic diseases). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within A79, choose A79.8 (Other specified rickettsioses) only when documentation doesn't support a more specific option: Trench fever (A79.0), Rickettsialpox due to Rickettsia akari (A79.1) and rickettsiosis, unspecified (A79.9).

To report this condition, pick the subcode that matches the documentation: A79.81 (sennetsu), A79.82 (phagocytophilum]) and A79.89 (rickettsioses).

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

Specific codes under A79.8

Notes that apply from higher levels

Instructions written at a parent level also apply to A79.8.

Broader instructions also apply from Chapter 1: Certain infectious and parasitic diseases.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about A79.8

Is A79.8 billable?

No. A79.8 is a header code. Report one of its more specific subcodes instead.