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ICD-10-CM 2027 diagnosis code

K58.2Mixed irritable bowel syndrome

✓ Billable / specific

K58.2 is a valid, billable ICD-10-CM code for mixed irritable bowel syndrome. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2017 (effective October 1, 2016). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About K58.2

K58.2 is the ICD-10-CM diagnosis code for mixed irritable bowel syndrome. It belongs to category K58 (irritable bowel syndrome), block K55-K64 (other diseases of intestines) and chapter 11 (diseases of the digestive system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within K58 (irritable bowel syndrome), K58.2 is specifically for mixed irritable bowel syndrome. Related codes cover with diarrhea (K58.0), with constipation (K58.1), other irritable bowel syndrome (K58.8) and unspecified (K58.9).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 391 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC, relative weight 1.2392) and DRG 392 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCC, relative weight 0.7645), 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 FY2017, effective October 1, 2016.

Before ICD-10, this condition was coded in ICD-9-CM as 564.1 (irritable bowel syndrome).

Notes that apply from higher levels

Instructions written at a parent level also apply to K58.2.

› From K58 Irritable bowel syndrome
Includes
  • irritable colon
  • spastic colon

Broader instructions also apply from Chapter 11: Diseases of the digestive system.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to K58.2.

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 →
  • 564.1Irritable bowel syndromeapproximate

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
  • FY2017 (effective 10/1/2016): Added
  • No changes since FY2017.

Common questions about K58.2

Is K58.2 billable?

Yes. K58.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can K58.2 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict K58.2 as a principal diagnosis.

Is K58.2 a CC or MCC?

No. K58.2 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does K58.2 group to?

K58.2 is used in the MS-DRG v44.0 logic for MS-DRG 391 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC) and MS-DRG 392 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without 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 K58.2?

The CMS General Equivalence Mappings map K58.2 to ICD-9-CM 564.1.