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ICD-10-CM 2027 diagnosis code

A04.71Enterocolitis due to Clostridium difficile, recurrent

✓ Billable / specificCC — complication/comorbidity

A04.71 is a valid, billable ICD-10-CM code for enterocolitis due to clostridium difficile, recurrent. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2018 (effective October 1, 2017). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About A04.71

A04.71 is the ICD-10-CM diagnosis code for enterocolitis due to Clostridium difficile, recurrent. It belongs to category A04 (other bacterial intestinal infections), 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 A04.7 (enterocolitis due to Clostridium difficile), A04.71 is specifically for enterocolitis due to Clostridium difficile, recurrent. Related codes cover not specified as recurrent (A04.72).

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 was added in FY2018, effective October 1, 2017.

Before ICD-10, this condition was coded in ICD-9-CM as 008.45 (intestinal infection due to Clostridium difficile).

Notes that apply from higher levels

Instructions written at a parent level also apply to A04.71.

› From A04 Other bacterial intestinal infections
Excludes1
  • bacterial foodborne intoxications, NEC (A05.-)
  • tuberculous enteritis (A18.32)

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

Alphabetic index entries

23 entries

Terms in the official ICD-10-CM index that lead to A04.71.

Codes whose notes reference A04.71

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 →
  • 008.45Intestinal infection due to Clostridium difficileapproximate

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
  • FY2018 (effective 10/1/2017): Added
  • No changes since FY2018.

Common questions about A04.71

Is A04.71 billable?

Yes. A04.71 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can A04.71 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict A04.71 as a principal diagnosis.

Is A04.71 a CC or MCC?

A04.71 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does A04.71 group to?

A04.71 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 A04.71?

The CMS General Equivalence Mappings map A04.71 to ICD-9-CM 008.45.