ICD-10 Code for UTI: Complete N39.0 Coding & Billing Guide (2026 Updated)

Urinary tract infections account for over 8.1 million outpatient visits annually in the United States. UTI-related denials remain high due to nonspecific coding.

What is ICD-10 Code for UTI?

The primary ICD-10 code for UTI is N39.0 (Urinary tract infection, site not specified).

Common Coding Mistakes

• Using unspecified codes when specific documentation exists
• Missing provider documentation
• Incorrect diagnosis linking

Billing Tips

Always ensure proper documentation supports the diagnosis code. Verify payer-specific rules to avoid denials.