2027 ICD-10-CM Diagnosis Code N39.0Urinary tract infection, site not specified
ICD-10-CM Codes›N00–N99›N30-N39›N39
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
N39.0 is a billable ICD-10-CM diagnosis code for urinary tract infection, site not specified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 689 through 690, 791, 793. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 75 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Urinary tract infections.
This medical diagnosis code is frequently used in Family Practice, Internal Medicine, OB/GYN, and Pediatrics medical specialties to designate conditions such urinary tract infection, cystitis.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acute lower urinary tract infection
- Acute upper urinary tract infection
- Acute urinary tract infection
- Bacterial urinary infection
- Catheter-associated urinary tract infection
- Chronic urinary tract infection
- Coliform urinary tract infection
- Febrile urinary tract infection
- Infection caused by Enterococcus
- Infection of urinary tract caused by Herpes simplex
- Lower urinary tract infectious disease
- Postoperative urinary tract infection
- Proteus urinary tract infection
- Pseudomonas aeruginosa urinary tract infection
- Recurrent urinary tract infection
- Sepsis due to urinary tract infection
- Upper urinary tract infection
- Urinary tract infection caused by Enterococcus
- Urinary tract infection caused by Escherichia coli
- Urinary tract infection caused by Klebsiella
- Urinary tract infection caused by Pseudomonas
- Urinary tract infection caused by Streptococcus agalactiae
- Urinary tract infection following procedure
- Urinary tract infectious disease
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to N39.0: its own notes plus those printed at N39, block N30-N39, and Chapter 14. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name N39.0, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming N39.0: they are not reported together with it, unless the two conditions are unrelated.
- N15.9 Renal tubulo-interstitial disease, unspecifiedurinary tract infection NOS (N39.0)
Use Additional Code 1
These codes say to use an additional code from the note, and N39.0 is one of the codes named.
- G90.4 Autonomic dysreflexiaurinary tract infection (N39.0)
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Urinary Tract Infections
inflammatory responses of the epithelium of the urinary tract to microbial invasions. they are often bacterial infections with associated bacteriuria and pyuria.
Patient EducationClinical
Urinary Tract Infections
The urinary system is the body's drainage system for removing wastes and extra water. It includes two kidneys, two ureters, a bladder, and a urethra. Urinary tract infections (UTIs) are the second most common type of infection in the body.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert N39.0 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About N39.0Overview
What is the ICD-10 code for urinary tract infection, site not specified?
The ICD-10-CM code for urinary tract infection, site not specified is N39.0 (sometimes written as N390). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is N39.0 (Other disorders of urinary system) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report urinary tract infection, site not specified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does N39.0 group to?
When urinary tract infection, site not specified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 689, 690, with relative weights from 0.8008 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Is N39.0 a CC or MCC?
CMS lists N39.0 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 75 closely related codes in its exclusion list.
Can N39.0 be reported with a code from B37.4?
Not as a rule. The Excludes1 note on N39.0 lists "candidiasis of urinary tract (B37.4-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
