K63.821
⚠ Non-billable
Small intestinal bacterial overgrowth
ICD-10-CM · FY2026 · Diseases of the Digestive System
Code
K63.821
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Diseases of the Digestive System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code K63.821?
ICD-10-CM code K63.821 represents Small intestinal bacterial overgrowth. It is a non-billable header code requiring a more specific subcategory in the Diseases of the Digestive System chapter, effective October 1, 2025 – September 30, 2026.
Is K63.821 billable?
No. K63.821 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is K63.821 in?
K63.821 belongs to the Diseases of the Digestive System chapter (K00–K95) of ICD-10-CM.
Related codes in the K63 category
K63
Other diseases of intestine
Non-billable
K63.0
Abscess of intestine
Billable
K63.1
Perforation of intestine (nontraumatic)
Billable
K63.2
Fistula of intestine
Billable
K63.3
Ulcer of intestine
Billable
K63.4
Enteroptosis
Billable
K63.5
Polyp of colon
Billable
K63.8
Other specified diseases of intestine
Non-billable
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