ICD-10-CM 2027
ICD-10 code for gastroenteritis
From the official ICD-10-CM alphabetic index entry “Gastroenteritis (acute) (chronic) (noninfectious)”. Page updated September 29, 2026.
About coding gastroenteritis
The ICD-10-CM code for gastroenteritis is K52.9 (Noninfective gastroenteritis and colitis, unspecified). The official index lists 25 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on K52.9.
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.
More specific gastroenteritis codes (official index)
- allergic K52.29 — Other allergic and dietetic gastroenteritis and colitis
- with
- eosinophilic gastritis or gastroenteritis K52.81 — Eosinophilic gastritis or gastroenteritis
- food protein-induced enterocolitis syndrome K52.21 — Food protein-induced enterocolitis syndrome
- food protein-induced enteropathy K52.22 — Food protein-induced enteropathy
- dietetic K52.29 — Other allergic and dietetic gastroenteritis and colitis
- drug-induced K52.1 — Toxic gastroenteritis and colitis
- due to
- Cryptosporidium A07.2 — Cryptosporidiosis
- drugs K52.1 — Toxic gastroenteritis and colitis
- food poisoning
- radiation K52.0 — Gastroenteritis and colitis due to radiation
- eosinophilic K52.81 — Eosinophilic gastritis or gastroenteritis
- epidemic (infectious) A09 — Infectious gastroenteritis and colitis, unspecified
- food hypersensitivity K52.29 — Other allergic and dietetic gastroenteritis and colitis
- infectious
- influenzal
- noninfectious K52.9 — Noninfective gastroenteritis and colitis, unspecified
- specified NEC K52.89 — Other specified noninfective gastroenteritis and colitis
- rotaviral A08.0 — Rotaviral enteritis
- Salmonella A02.0 — Salmonella enteritis
- toxic K52.1 — Toxic gastroenteritis and colitis
- viral NEC A08.4 — Viral intestinal infection, unspecified
- acute infectious A08.39 — Other viral enteritis
- type Norwalk A08.11 — Acute gastroenteropathy due to Norwalk agent
- infantile (acute) A08.39 — Other viral enteritis
- Norwalk agent A08.11 — Acute gastroenteropathy due to Norwalk agent
- rotaviral A08.0 — Rotaviral enteritis
- severe of infants A08.39 — Other viral enteritis
- specified type NEC A08.39 — Other viral enteritis
Don't confuse with (Excludes1 for K52.9)
Common questions about gastroenteritis ICD-10 codes
What is the ICD-10 code for gastroenteritis?
- K52.9 — Noninfective gastroenteritis and colitis, unspecified. More specific codes apply when the documentation supports them: K52.29, K52.81, K52.21, K52.22 and others below.
What is the ICD-10 code for allergic gastroenteritis?
- K52.29 — Other allergic and dietetic gastroenteritis and colitis.
What is the ICD-10 code for dietetic gastroenteritis?
- K52.29 — Other allergic and dietetic gastroenteritis and colitis.
What is the ICD-10 code for drug-induced gastroenteritis?
- K52.1 — Toxic gastroenteritis and colitis.
What is the ICD-10 code for eosinophilic gastroenteritis?
- K52.81 — Eosinophilic gastritis or gastroenteritis.
What is the ICD-10 code for epidemic gastroenteritis?
- A09 — Infectious gastroenteritis and colitis, unspecified.
What is the ICD-10 code for food hypersensitivity gastroenteritis?
- K52.29 — Other allergic and dietetic gastroenteritis and colitis.
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.