K63.821 – Small intestinal bacterial overgrowth
ICD-10-CM 2027 diagnosis code · Other diseases of intestines
ICD-10-CM code
K63.821
- Code
K63.821(claims format:K63821)- Description
- Small intestinal bacterial overgrowth
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 11. Diseases of the digestive system (K00-K95)
- Block
- K55-K64 Other diseases of intestines
- Parent codes
- K63 › K63.8 › K63.82
Billable codes under K63.821
K63.821 is a header code and cannot be used on claims. Choose the most specific code:
Related codes in K63.82
Frequently asked questions
What is ICD-10 code K63.821?
K63.821 is the ICD-10-CM code for small intestinal bacterial overgrowth, in the block K55-K64 (Other diseases of intestines).
Is K63.821 a billable code?
No. K63.821 is a header code with more specific child codes; report one of the billable codes listed above.
What category does K63.821 belong to?
It belongs to category K63 – Other diseases of intestine.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.