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ICD-10-CM 2027 diagnosis code

A42.8Other forms of actinomycosis

Not billable — use a more specific code

A42.8 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 A42.8

A42.8 is the ICD-10-CM diagnosis code for other forms of actinomycosis. It belongs to category A42 (actinomycosis), block A30-A49 (other bacterial diseases) 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 A42, choose A42.8 (Other forms of actinomycosis) only when documentation doesn't support a more specific option: pulmonary actinomycosis (A42.0), abdominal actinomycosis (A42.1), Cervicofacial actinomycosis (A42.2), actinomycotic sepsis (A42.7) and unspecified (A42.9).

To report this condition, pick the subcode that matches the documentation: A42.81 (meningitis), A42.82 (encephalitis) and A42.89 (actinomycosis).

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 A42.8

Notes that apply from higher levels

Instructions written at a parent level also apply to A42.8.

› From A42 Actinomycosis
Excludes1

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 A42.8

Is A42.8 billable?

No. A42.8 is a header code. Report one of its more specific subcodes instead.