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K63.821

Non-billable

Small intestinal bacterial overgrowth

K63.821 is the ICD-10-CM code for Small intestinal bacterial overgrowth. It is a non-billable category code — use a more specific child code such as K63.8211 for billing.

Status
Header (non-billable)
Chapter
K00-K95
Parent
K63.82
Subcodes
3
Edition
FY2026

K00-K95 Diseases of the digestive system

No additional coding notes for this code.

Frequently asked questions

What is ICD-10 code K63.821?
K63.821 is the ICD-10-CM code for "Small intestinal bacterial overgrowth". It falls under K00-K95 Diseases of the digestive system.
Is K63.821 a billable code?
No — K63.821 is a non-billable header code. Use a more specific child code (such as K63.8211) for billing.
What are the subcodes of K63.821?
K63.821 has 3 more specific child codes, including K63.8211, K63.8212, K63.8219.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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