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ICD-10-CM 2027 diagnosis code

A00.0Cholera due to Vibrio cholerae 01, biovar cholerae

✓ Billable / specificCC — complication/comorbidity

A00.0 is a valid, billable ICD-10-CM code for cholera due to vibrio cholerae 01, biovar cholerae. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

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 A00.0

A00.0 is the ICD-10-CM diagnosis code for cholera due to Vibrio cholerae 01, biovar cholerae. It belongs to category A00 (cholera), block A00-A09 (intestinal infectious diseases) and chapter 1 (certain infectious and parasitic diseases). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within A00 (cholera), A00.0 is specifically for cholera due to Vibrio cholerae 01, biovar cholerae. Related codes cover due to Vibrio cholerae 01, biovar eltor (A00.1) and unspecified (A00.9).

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 371 (Major Gastrointestinal Disorders and Peritoneal Infections with MCC, relative weight 1.7089), DRG 372 (Major Gastrointestinal Disorders and Peritoneal Infections with CC, relative weight 0.9964) and DRG 373 (Major Gastrointestinal Disorders and Peritoneal Infections without CC/MCC, relative weight 0.6941), in MDC 06 (Diseases and Disorders of the Digestive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

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

Before ICD-10, this condition was coded in ICD-9-CM as 001.0 (cholera due to vibrio cholerae).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Classical cholera

Notes that apply from higher levels

Instructions written at a parent level also apply to A00.0.

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

Alphabetic index entries

3 entries

Terms in the official ICD-10-CM index that lead to A00.0.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 001.0Cholera due to vibrio choleraeexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

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 A00.0

Is A00.0 billable?

Yes. A00.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can A00.0 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict A00.0 as a principal diagnosis.

Is A00.0 a CC or MCC?

A00.0 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does A00.0 group to?

A00.0 is used in the MS-DRG v44.0 logic for MS-DRG 371 (Major Gastrointestinal Disorders and Peritoneal Infections with MCC), MS-DRG 372 (Major Gastrointestinal Disorders and Peritoneal Infections with CC) and MS-DRG 373 (Major Gastrointestinal Disorders and Peritoneal Infections without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for A00.0?

The CMS General Equivalence Mappings map A00.0 to ICD-9-CM 001.0.