ICD-10-CM · Chapter 11 · K00–K95
K63.821
Small intestinal bacterial overgrowth
Diseases of the digestive system
Heads up:this is a parent code. It's typically not directly billable — you need to drill down to a more specific child code (one with additional digits) to use on a claim.
Quick facts
- Code
- K63.821
- Type
- Category / header (non-billable)
- ICD-10-CM chapter
- Chapter 11 — Diseases of the digestive system
- Category
- K63 — Other diseases of intestine
- Specificity
- 6 characters
How coders use this code
ICD-10-CM K63.821 is a category (header) for small intestinal bacterial overgrowth. It is generally not reported directly on a claim — coders drill down to a more specific child code (one with additional characters) that matches the documentation. Use the related codes below to find the billable code that fits, and verify against the annual NCHS/CMS guidelines.
Related codes in K63
- K63Other diseases of intestine
- K63.0Abscess of intestine
- K63.1Perforation of intestine (nontraumatic)
- K63.2Fistula of intestine
- K63.3Ulcer of intestine
- K63.4Enteroptosis
- K63.5Polyp of colon
- K63.8Other specified diseases of intestine
- K63.81Dieulafoy lesion of intestine
- K63.82Intestinal microbial overgrowth
- K63.8211Small intestinal bacterial overgrowth, hydrogen-subtype
- K63.8212Small intestinal bacterial overgrowth, hydrogen sulfide-subtype
- K63.8219Small intestinal bacterial overgrowth, unspecified
- K63.822Small intestinal fungal overgrowth
- K63.829Intestinal methanogen overgrowth, unspecified
Want to learn coding?
Master ICD-10-CM in 90 days.
Medita's 90-day curriculum is calibrated to the CPC (AAPC), CCA, and CCS (AHIMA) exam blueprints. Day 1 is free.