The primary ICD-10-CM code for urinary tract infection is N39.0 (Urinary tract infection, site not specified), a billable code reported when a UTI is documented without specifying the anatomical site of infection.
Primary codes
Billable
Billable
Extension
—
7th character
—
POA exempt
No
Type 1 excludes
Use additional code
- code (B95-B97), to identify infectious agent.
Coding risks
- Missing a required companion or status code
- Pairing with a mutually-exclusive code (Excludes-1 violation)
Hierarchy
Code ranges
Other disorders of urinary system
Category covering urinary tract infections, incontinence, and other urinary system disorders not classified to specific structural or inflammatory conditions.
Other diseases of the urinary system
Sub-chapter grouping cystitis, urethritis, urethral disorders, and other urinary system conditions outside glomerular and renal tubulo-interstitial disease.
Cystitis
Inflammatory conditions of the urinary bladder including acute, chronic, interstitial, and irradiation cystitis with or without hematuria.
Infections of genitourinary tract in pregnancy
Obstetric codes capturing urinary and genital tract infections occurring during pregnancy, with trimester specificity required for accurate reporting.
Pain associated with micturition
Symptom codes for dysuria, painful urination, and vesical tenesmus when no confirmed infection or underlying diagnosis is documented.
Coding risks
Avoid these common coding issues when reporting Urinary Tract Infection.
Impact
Assigning N39.0 without a documented site may miscode when cystitis (N30.-) or pyelonephritis (N10) is actually supported.
Mitigation
Consider querying the provider when the site is absent rather than defaulting to N39.0 based on urinalysis alone.
Related codes
Ancillary and co-coding
Codes commonly reported with the primary diagnosis on the same claim.
Z-code variants
Family history, personal history, or screening encounter codes related to this condition.
In pregnancy
Pregnancy-specific O-code adaptations used in place of the primary when the condition occurs during or complicates pregnancy.
Differential codes
Alternative or commonly confused codes to consider when documentation suggests a different condition than the primary diagnosis.
Frequently asked questions
Use N39.0 only when documentation does not specify the site of infection. If cystitis or pyelonephritis is documented, assign the site-specific code instead.
References
Compiled from the following authoritative coding references. Last updated 2026-08-04.