ICD-10-CM 2027
ICD-10 code for duodenitis
From the official ICD-10-CM alphabetic index entry “Duodenitis (nonspecific) (peptic)”. Page updated September 29, 2026.
About coding duodenitis
The ICD-10-CM code for duodenitis is K29.80 (Duodenitis without bleeding). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on K29.80.
Within K29.8, choose K29.80 (without bleeding) only when documentation doesn't support a more specific option: with bleeding (K29.81).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 391 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC, relative weight 1.2392) and DRG 392 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCC, relative weight 0.7645), in MDC 06 (Diseases and Disorders of the Digestive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific duodenitis codes (official index)
- with bleeding K29.81 — Duodenitis with bleeding
- erosive
Common questions about duodenitis ICD-10 codes
What is the ICD-10 code for duodenitis?
- K29.80 — Duodenitis without bleeding. More specific codes apply when the documentation supports them: K29.81.
Is K29.80 billable?
- Yes. K29.80 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K29.80 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K29.80 as a principal diagnosis.
Is K29.80 a CC or MCC?
- No. K29.80 is neither a CC nor an MCC under MS-DRG v44.0.