ICD-10-CM · Genitourinary system
ICD-10-CM · Genitourinary systemN39.0: Urinary tract infection, site not specified
N39.0 is the ICD-10-CM code for Urinary tract infection, site not specified. Billable on U.S. claims with supporting documentation. Chapter: Genitourinary system. Category: N39.
About this code
Urinary tract infection, site not specified.
N39.0 is an ICD-10-CM diagnosis code for urinary tract infection, site not specified. It sits in the 14. Genitourinary system chapter of the U.S. clinical modification, under category N39.
This code is billable on U.S. healthcare claims when supported by appropriate clinical documentation. The patient chart must establish the diagnosis, capture any clinical detail encoded in the code (severity, laterality, encounter type, complications where applicable), and demonstrate medical necessity for the billed services.
Payer-specific coverage rules vary. Always cross-check against the current Local Coverage Determinations (LCDs) and National Coverage Determinations (NCDs) for the payer adjudicating the claim, plus any specialty-specific CMS Medicare Administrative Contractor guidance.
Billing context
What practitioners watch for on N39.0.
Code-specific billing guidance for N39.0, written from production billing experience.
Documentation
Urinary tract infection, site not specified. If site is documented (cystitis N30.x, pyelonephritis N10), use the more specific code. Add B96.x as an additional code if causative organism (E. coli, Klebsiella) is identified by culture.
Common denial categories
- CO-16: Information missing or incorrect on the claim or in supporting documentation. Add documentation specificity that supports the coded detail; resubmit with corrected information.
- CO-50: Service not deemed medically necessary by the payer. Confirm the diagnosis-procedure relationship matches LCD/NCD coverage, attach clinical justification, appeal with documentation.
- CO-11: Diagnosis is inconsistent with the procedure performed. Verify the diagnosis-to-procedure pairing per payer policy; correct the linked diagnosis pointer or the procedure code.
Coverage signal
Urine culture is generally covered for symptomatic UTI. Antibiotic coverage is broad; some payers require step therapy for fluoroquinolones or carbapenems.
Common specialties
Urology · Family Medicine · OB-GYN · Urgent Care
Companion CPT codes
Procedures commonly billed alongside N39.0 based on Medonix client production data and CMS coding guidance.
- 81003Urinalysis automated, without microscopy
- 81025Urine pregnancy test (when applicable)
- 87086Urine culture, bacterial
- 87088Urine culture identification with antibiotic susceptibility
CPT is a registered trademark of the American Medical Association. Codes shown for educational reference only.
Related codes
Other codes in category N39.
Sources
Where this entry comes from.
- NLM Clinical Tables Search Service: the official U.S. National Library of Medicine API for ICD-10-CM lookup.
- CDC National Center for Health Statistics: annual ICD-10-CM Tabular List release with effective date October 1.
- CMS Medicare Coverage Database: Local Coverage Determinations and National Coverage Determinations for payer-specific rules.
Frequently asked
About ICD-10 code N39.0.
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