ICD-10-CM 2027
ICD-10 code for IBDU
From the official ICD-10-CM alphabetic index entry “IBDU (colonic inflammatory bowel dissease unclassified)”. Page updated September 29, 2026.
About coding IBDU
The ICD-10-CM code for IBDU is K52.3 (Indeterminate colitis).
Within K52 (other and unspecified noninfective gastroenteritis and colitis), K52.3 is specifically for indeterminate colitis. Related codes cover gastroenteritis and colitis due to radiation (K52.0), toxic gastroenteritis and colitis (K52.1), allergic and dietetic gastroenteritis and colitis (K52.2), other specified noninfective gastroenteritis and colitis (K52.8) and noninfective gastroenteritis and colitis, unspecified (K52.9).
Don't report K52.3 together with the conditions in its Excludes1 note: unspecified colitis (K52.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Don't confuse with (Excludes1 for K52.3)
- unspecified colitis (K52.9)
Common questions about IBDU ICD-10 codes
What is the ICD-10 code for IBDU?
- K52.3 — Indeterminate colitis.
Is K52.3 billable?
- Yes. K52.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K52.3 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K52.3 as a principal diagnosis.
Is K52.3 a CC or MCC?
- No. K52.3 is neither a CC nor an MCC under MS-DRG v44.0.