ICD-10-CM 2027
ICD-10 code for intestinal methanogen overgrowth
From the official ICD-10-CM alphabetic index entry “Overgrowth › intestinal methanogen”. Page updated September 29, 2026.
About coding intestinal methanogen overgrowth
The ICD-10-CM code for intestinal methanogen overgrowth is K63.829 (Intestinal methanogen overgrowth, unspecified).
Within K63.82, choose K63.829 (Intestinal methanogen overgrowth, unspecified) only when documentation doesn't support a more specific option: small intestinal bacterial overgrowth (K63.821) and small intestinal fungal overgrowth (K63.822).
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 393 (Other Digestive System Diagnoses with MCC, relative weight 1.5881), DRG 394 (Other Digestive System Diagnoses with CC, relative weight 0.9228) and DRG 395 (Other Digestive System Diagnoses without CC/MCC, relative weight 0.6382), 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.
Common questions about intestinal methanogen overgrowth ICD-10 codes
What is the ICD-10 code for intestinal methanogen overgrowth?
- K63.829 — Intestinal methanogen overgrowth, unspecified.
Is K63.829 billable?
- Yes. K63.829 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K63.829 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K63.829 as a principal diagnosis.
Is K63.829 a CC or MCC?
- No. K63.829 is neither a CC nor an MCC under MS-DRG v44.0.