ICD-10-CM 2027 diagnosis code
K52.9Noninfective gastroenteritis and colitis, unspecified
K52.9 is a valid, billable ICD-10-CM code for noninfective gastroenteritis and colitis, unspecified. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Looking up by condition? See ICD-10 code for Cecitis, ICD-10 code for Colitis, ICD-10 code for Ileitis, ICD-10 code for Enteritis.
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 K52.9
K52.9 is the ICD-10-CM diagnosis code for noninfective gastroenteritis and colitis, unspecified. It belongs to category K52 (other and unspecified noninfective gastroenteritis and colitis), block K50-K52 (noninfective enteritis and colitis) 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 K52, choose K52.9 (Noninfective gastroenteritis and colitis, unspecified) only when documentation doesn't support a more specific option: gastroenteritis and colitis due to radiation (K52.0), toxic gastroenteritis and colitis (K52.1), allergic and dietetic gastroenteritis and colitis (K52.2), indeterminate colitis (K52.3) and other specified noninfective gastroenteritis and colitis (K52.8).
Don't report K52.9 together with the conditions in its Excludes1 note: diarrhea NOS (R19.7), functional diarrhea (K59.1), infectious gastroenteritis and colitis NOS (A09), neonatal diarrhea (noninfective) (P78.3) and 1 more.
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 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 558.9 (other and unspecified noninfectious gastroenteritis and colitis).
Coding notes
- Colitis NOS
- Enteritis NOS
- Gastroenteritis NOS
- Ileitis NOS
- Jejunitis NOS
- Sigmoiditis NOS
Notes that apply from higher levels
Instructions written at a parent level also apply to K52.9.
Broader instructions also apply from K50-K52 Noninfective enteritis and colitis and Chapter 11: Diseases of the digestive system.
Alphabetic index entries
18 entriesTerms in the official ICD-10-CM index that lead to K52.9.
- Cecitis
- Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic)
- Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) › noninfective
- Diarrhea, diarrheal (disease) (infantile) (inflammatory) › chronic (noninfectious)
- Diarrhea, diarrheal (disease) (infantile) (inflammatory) › noninfectious
- Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)
- Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective) › chronic (noninfectious)
- Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective) › noninfectious
- Enterocolitis
- Enterocolitis › noninfectious
- Gastroenteritis (acute) (chronic) (noninfectious)
- Gastroenteritis (acute) (chronic) (noninfectious) › noninfectious
- Gastroenteropathy
- Gastrojejunitis
- Ileitis (chronic) (noninfectious)
- Ileocolitis
- Sigmoiditis
- Sigmoiditis › noninfectious
Codes whose notes reference K52.9
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.
MDC 06 · Diseases and Disorders of the Digestive System
ICD-9-CM equivalent
Converter →- 558.9Other and unspecified noninfectious gastroenteritis and colitisapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about K52.9
Is K52.9 billable?
- Yes. K52.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K52.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K52.9 as a principal diagnosis.
Is K52.9 a CC or MCC?
- No. K52.9 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does K52.9 group to?
- K52.9 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 K52.9?
- The CMS General Equivalence Mappings map K52.9 to ICD-9-CM 558.9.