K57.13 Diverticulitis of small intestine without perforation or abscess with bleeding

ICD-10-CM Diagnosis Code K57.13: Diverticulitis of small intestine without perforation or abscess with bleeding

ICD-10-CM code K57.13 identifies diverticulitis of the small intestine without perforation or abscess, specifically when bleeding is present. This active diagnosis concept is classified under parent code K57.1 for non-perforated small intestine diverticular disease. General clinical sources describe diverticular bleeding as a burst blood vessel and note that uncomplicated cases may be managed at home. 1 3

Plain-language overview

Diverticular bleeding occurs when a small blood vessel within the wall of a pouch bursts, and patients with diverticulitis without complications may receive treatment at home. 3

What this code represents

The official label for K57.13 is diverticulitis of small intestine without perforation or abscess with bleeding, and the concept is classified as a disease or syndrome. 1

K57.13 is an active terminology concept that falls under the parent code K57.1, which designates diverticular disease of small intestine without perforation or abscess. 1

Coding details

K57.13 is distinct from K57.12, which represents diverticulitis of small intestine without perforation or abscess without bleeding, establishing that the final character specifies bleeding presence. 5

Code K57.13 is listed alongside large intestine variations like K57.33, demonstrating that the ICD-10-CM structure distinguishes diverticulitis by anatomical location such as small versus large intestine. 5

Documentation considerations

A coding reference indicates that the K57.13 code is intended for use on a patient confirmed to have diverticulitis, specifically of their small intestines. 6

Coverage and utilization context

Patients with suspected active bleeding, such as ongoing rectal bleeding, may undergo immediate CT angiogram to identify the bleeding source and inform treatment planning. 2

What the sources add

While the terminology record defines the code structure, clinical literature adds that aspirin and nonsteroidal anti-inflammatory drugs increase the risk for diverticulitis and diverticular bleeding. 1 2

A terminology record establishes the official code label and hierarchy, whereas a coding reference notes the code is intended for confirmed diverticulitis of the small intestines. 1 6

Sources

1. ICD-10-CM K57.13 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Diverticular disease: update on pathophysiology, classification and management — pmc.ncbi.nlm.nih.gov; accessed 2026-07-27.
3. Diverticulosis | Diverticulitis | MedlinePlus — medlineplus.gov; accessed 2026-07-27.
4. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
5. ICD-10-CM 2024 | K55-K64 - Other diseases of intestines — unboundmedicine.com; accessed 2026-07-27.
6. Diverticulitis ICD-10-CM Codes — carepatron.com; accessed 2026-07-27.