K52.2 Allergic and dietetic gastroenteritis and colitis

ICD-10-CM K52.2: Allergic and dietetic gastroenteritis and colitis

ICD-10-CM code K52.2 represents allergic and dietetic gastroenteritis and colitis, explicitly encompassing food hypersensitivity gastroenteritis or colitis. It falls under the broader category of noninfective enteritis and colitis. The code serves as a parent classification, with more specific subcodes available for distinct conditions like food protein-induced enterocolitis syndrome. 5 6

Plain-language overview

ICD-10-CM code K52.2 identifies allergic and dietetic gastroenteritis and colitis, a diagnosis that explicitly includes food hypersensitivity gastroenteritis or colitis. 5

What this code represents

The K52.2 diagnosis code functions as a parent classification within the K50-K52 noninfective enteritis and colitis grouping, containing more specific subcodes such as K52.21 for food protein-induced enterocolitis syndrome. 6

The K52.2 category includes distinct clinical subcodes, specifically K52.21 for food protein-induced enterocolitis syndrome, K52.22 for food protein-induced enteropathy, and K52.29 for other allergic and dietetic gastroenteritis and colitis. 6

Coding details

The World Health Organization ICD-10 classification lists K52.2 as allergic and dietetic gastroenteritis and colitis, placing it directly adjacent to K52.3 for indeterminate colitis. 5

Documentation considerations

Research on food protein-induced enterocolitis syndrome utilized specific International Classification of Diseases codes to identify cases, including K52.21, K52.22, and K52.29. 2

Coverage and utilization context

The Centers for Medicare and Medicaid Services lists other allergic and dietetic gastroenteritis and colitis alongside indeterminate colitis and eosinophilic gastritis within billing and coding articles for diagnostic and therapeutic colonoscopy. 3

The Centers for Medicare and Medicaid Services includes other allergic and dietetic gastroenteritis and colitis in an allergy testing billing and coding article, placing it near indeterminate colitis and collagenous colitis. 4

What the sources add

While the World Health Organization defines K52.2 as a single entity, the Unbound Medicine source details its hierarchical breakdown into specific subcodes like K52.21 and K52.29. 5 6

The International Classification of Diseases revision established a section for allergic and hypersensitivity conditions under Disorders of the Immune System to aggregate reliable data for healthcare quality improvements. 1

Sources

1. New Allergic and Hypersensitivity Conditions Section in the International Classification of Diseases-11 — pmc.ncbi.nlm.nih.gov; accessed 2026-07-25.
2. Clinical Significance of Egg Sensitization in Pediatric Food Protein-Induced Enterocolitis Syndrome to Hen’s Egg — pmc.ncbi.nlm.nih.gov; accessed 2026-07-25.
3. Article - Billing and Coding: Diagnostic and Therapeutic Colonoscopy (A57342) — cms.gov; accessed 2026-07-25.
4. Article - Billing and Coding: Allergy Testing (A57473) — cms.gov; accessed 2026-07-25.
5. ICD-10 Version:2016 — icd.who.int; accessed 2026-07-25.
6. K52.29 - Other allergic and dietetic gastroenteritis and colitis | ICD-10-CM — unboundmedicine.com; accessed 2026-07-25.