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ICD-10-CM 2027 diagnosis code

A00Cholera

Not billable — use a more specific code

A00 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.

Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS, effective October 1, 2026. Updated September 29, 2026. About our data

About A00

A00 is the ICD-10-CM diagnosis code for cholera. 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 3 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: A00.0 (due to Vibrio cholerae 01, biovar cholerae), A00.1 (due to Vibrio cholerae 01, biovar eltor) and A00.9 (unspecified).

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 A00

Notes that apply from higher levels

Instructions written at a parent level also apply to A00.

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

Codes whose notes reference A00

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 A00

Is A00 billable?

No. A00 is a header code. Report one of its more specific subcodes instead.