ICD-10 Code K59.4 – Anal spasm (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K59.4 – Anal spasm
What it is
K59.4 identifies anal spasm, a functional disorder involving involuntary tightening of the anal sphincter or pelvic floor. It is used when the record specifically documents anal spasm rather than another anorectal condition.
Clinical signs
Clinical features vary; refer to documentation. Commonly noted findings include episodic anal pain, spasm, or difficulty relaxing the anal sphincter during examination.
When to use this code
Use K59.4 when the provider documents anal spasm as the diagnosis or as the reason for anorectal symptoms. It may also fit when the chart describes sphincter spasm without a more specific alternate diagnosis. Check documentation if the note instead points to fissure, hemorrhoids, or another cause.
Do not use for
Do not use this code for nonspecific rectal pain, constipation, or anal fissure unless anal spasm is documented separately. If the record does not clearly support spasm, check documentation.
Coding tip
Code K59.4 only when the clinician explicitly names anal spasm; otherwise, query for clarification.