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ICD-10-CM 2027 diagnosis code

A04Other bacterial intestinal infections

Not billable — use a more specific code

A04 is a header code, so it can't be reported by itself. Choose one of the 10 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 A04

A04 is the ICD-10-CM diagnosis code for other bacterial intestinal infections. It belongs to block A00-A09 (intestinal infectious 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 10 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: A04.0 (infection), A04.1 (infection), A04.2 (infection), A04.3 (infection), A04.4 (infections), A04.5 (enteritis), A04.6 (enterocolitica), A04.7 (difficile) and 2 more.

Don't report A04 together with the conditions in its Excludes1 note: bacterial foodborne intoxications, NEC (A05.-) and tuberculous enteritis (A18.32).

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 A04

Coding notes

Excludes1Not coded here — never report together with this code
  • bacterial foodborne intoxications, NEC (A05.-)
  • tuberculous enteritis (A18.32)

Notes that apply from higher levels

Instructions written at a parent level also apply to A04.

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

Codes whose notes reference A04

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 A04

Is A04 billable?

No. A04 is a header code. Report one of its more specific subcodes instead.