K59.1

Billable

Functional diarrhea

K59.1 is the ICD-10-CM code for Functional diarrhea. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
K00-K95
Parent
K59
Edition
FY2026

K00-K95 Diseases of the digestive system

Excludes1 — not coded here

  • diarrhea NOS (R19.7)
  • irritable bowel syndrome with diarrhea (K58.0)

Frequently asked questions

What is ICD-10 code K59.1?
K59.1 is the ICD-10-CM code for "Functional diarrhea". It falls under K00-K95 Diseases of the digestive system.
Is K59.1 a billable code?
Yes — K59.1 is a billable, specific ICD-10-CM code valid for reimbursement.
What is excluded from K59.1?
Excludes1 (not coded here): diarrhea NOS (R19.7); irritable bowel syndrome with diarrhea (K58.0).

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

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