K52.3 Indeterminate colitis

The ICD-10-CM code for Indeterminate colitis is K52.3 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

11: Diseases of the digestive system (K00-K95)

Section

K50-K52: Noninfective enteritis and colitis (K50-K52)

Category K52

18 codes (14 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to K52.3:

• IBDU (colonic inflammatory bowel dissease unclassified)
• Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) › indeterminate, so stated
• Disease, diseased › colonic inflammatory bowel, unclassified (IBDU)

Inclusion Terms

• Colonic inflammatory bowel disease unclassified (IBDU)

U.S. Hospital Utilization

• An estimated 1,770 U.S. inpatient stays in 2023 included K52.3 among the documented diagnoses.
• 435 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Chapter 11 reserved for future expansion

11. Chapter 11: Diseases of the Digestive System (K00-K95) Reserved for future guideline expansion

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)

Cite This Page

Reference K52.3 with the canonical source and edition:

K52.3 — Indeterminate colitis. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/K52.3

Canonical URL: https://icd10codingpro.com/codes/K52.3