N39.0 Urinary tract infection, site not specified
The ICD-10-CM code for Urinary tract infection, site not specified is N39.0 (FY2026). It is a billable, claim-ready diagnosis code.
Choosing between codes? See the guide: ICD-10 code for urinary tract infection (UTI).
Classification
- Section
- N30-N39: Other diseases of the urinary system (N30-N39)
- Category N39
- 17 codes (14 billable)
- FY2026 Status
- Stable since FY2024
Also Known As
ICD-10-CM Alphabetic Index entries that lead to N39.0:
- Infection, infected, infective (opportunistic) › urinary (tract)
- Urine › pus in
- Pus › in › urine
U.S. Hospital Utilization
- An estimated 2,111,450 U.S. inpatient stays in 2023 included N39.0 among the documented diagnoses.
- 243,600 stays listed it as the principal diagnosis.
Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.
Prevalence & Statistics
- In 2022, urinary tract infection (site not specified) was the primary diagnosis at an estimated 1,655,000 emergency department visits in the United States, accounting for 1.1% of all ED visits. (CDC/NCHS National Hospital Ambulatory Medical Care Survey: 2022 Emergency Department Summary Tables (Table 11), 2022)
Official Coding Guidelines
CKD staging and code assignment (N18.-)The ICD-10-CM classifies CKD based on severity. The severity of CKD is designated by stages 1-5. Stage 2, code N18.2, equates to mild CKD; stage 3, codes N18.30-N18.32, equate to moderate CKD; and stage 4, code N18.4, equates to severe CKD. Code N18.6, End stage renal disease (ESRD), is assigned when the provider has documented end- stage renal disease (ESRD).
CKD stage plus ESRD: assign N18.6 onlyIf both a stage of CKD and ESRD are documented, assign code N18.6 only.
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026