What is the ICD-10-CM code for a urinary tract infection?

The general ICD-10-CM code for a urinary tract infection is N39.0, urinary tract infection, site not specified. It is used when the provider documents a UTI without identifying which part of the urinary tract is infected. When the documentation names a specific site, such as the bladder or kidney, a more specific code from the cystitis or pyelonephritis categories is generally the better choice.

When should a coder use a cystitis or pyelonephritis code instead of N39.0?

A coder should use a more specific code when the provider documents the site of infection. Acute cystitis is coded in the N30 category, with separate codes for cystitis with and without hematuria, and acute pyelonephritis is coded to N10. If the note says only urinary tract infection, N39.0 is appropriate, and the coder should not assume a site the provider did not document.

Does a UTI diagnosis need an organism code?

ICD-10-CM instructs coders to add a code from the B95 to B97 range to identify the infectious agent when the organism is known. For example, a UTI caused by Escherichia coli can be reported with N39.0 plus the code for E. coli as the cause of diseases classified elsewhere. The organism is only coded when the provider documents it, so the culture result alone should not be coded without provider documentation.

Can urosepsis be coded in ICD-10-CM?

No. The term urosepsis is nonspecific and has no default code in ICD-10-CM, so the coder should query the provider to clarify whether the patient has a UTI, sepsis, or both. The final diagnosis should reflect what the provider documents, because sepsis and UTI are coded differently and carry different clinical and payment implications.

Why are UTI claims denied because of diagnosis coding?

Common reasons include reporting the unspecified code when the note supports a more specific one, a diagnosis that does not support the medical necessity of the urinalysis, culture, or treatment billed, a missing organism code when the organism is documented, a code that does not match the documentation, and an outdated code reported after the annual code set update.

How can practices keep UTI coding accurate as the code set changes?

ICD-10-CM is updated each year, with changes taking effect on October 1, so practices should confirm codes against the current code set and the official coding guidelines rather than relying on last year's references. Auditing a sample of diagnosis codes against provider notes, training providers on documenting site and organism, and working with an experienced coding partner all help keep diagnosis coding accurate.

UTI ICD-10-CM Codes: Complete 2026 Coding Guide

Quick Answer: What Is the ICD 10 Code for UTI?

The general ICD 10 code for UTI is N39.0, urinary tract infection, site not specified. Our team at Care RCM uses it when the provider documents a urinary tract infection and never says where in the urinary tract it sits.

That last part matters. Once a provider documents cystitis, pyelonephritis, or another specified site, N39.0 usually stops being the right answer. The Tabular List carries an Excludes1 note at N39.0 for urinary tract infection of a specified site, so the coder has to move to the matching code family. Specific documentation gives the payer a clearer picture of the visit and gives your team fewer reasons to rework a claim later.

UTI ICD-10-CM Codes at a Glance

This is a compact reference for the codes we see most often in urinary tract infection coding. Descriptors follow the official ICD-10-CM wording, but confirm every code, note, and descriptor in the official files for the date of service.

Code	Official description	Documentation needed	Coding caution
N39.0	Urinary tract infection, site not specified	UTI documented with no site named	Excludes1 note covers UTI of a specified site
N30.00	Acute cystitis without hematuria	Acute cystitis documented, no hematuria	Hematuria changes the code, so read the note
N30.01	Acute cystitis with hematuria	Acute cystitis with hematuria documented	Don’t assume hematuria from a lab result alone
N30.90	Cystitis, unspecified, without hematuria	Cystitis documented, type not stated	Review other N30 options before settling here
N10	Acute pyelonephritis	Provider documents acute pyelonephritis	Flank pain or fever alone doesn’t support it
N12	Tubulo-interstitial nephritis, not specified as acute or chronic	Pyelonephritis with acuity not stated	Confirm inclusion terms in the Tabular List
N13.6	Pyonephrosis	Provider documents pyonephrosis	Named in the N39.0 exclusion note
T83.511A	Infection and inflammatory reaction due to indwelling urethral catheter, initial encounter	Provider links the infection to the catheter	Check sequencing and the 7th character
B96.20	Unspecified Escherichia coli [E. coli] as the cause of diseases classified elsewhere	Provider documents the organism	Supplemental code, never the lead diagnosis

Want a second set of eyes on UTI claims? Care RCM helps practices with coding accuracy, documentation alignment, and coding workflow support. Explore our Medical Coding Services, call 703-345-9216, or email operations@carercm.us.

Unspecified Site or Documented Site?

When N39.0 fits

A note that says UTI or urinary tract infection and nothing more supports N39.0. Don’t fill in the blanks. If the provider never wrote bladder, kidney, or urethra, the coder shouldn’t either.

When the site is documented

Cystitis points to the N30 family, where hematuria documentation changes the code. Acute pyelonephritis points to N10. Pyonephrosis has its own code, N13.6, and it appears in the N39.0 exclusion note. Whichever code you land on, read its inclusion terms, Excludes notes, and any use additional code instruction.

Symptoms are not a diagnosis

Dysuria, urgency, flank pain, fever, and a positive urinalysis can all travel with a UTI. They don’t confirm one. In outpatient settings, diagnoses documented as probable, suspected, questionable, rule out, or consistent with aren’t coded as confirmed. Code the symptoms, signs, or findings to the highest degree of certainty for that visit, as Section IV.H of the official guidelines directs.

Organism Codes: When an Additional Code May Apply

N39.0 carries a use additional code note that points to categories B95 to B97 for the infectious agent. That instruction is why an organism code may follow, so read the note on the code you’re actually using instead of assuming one exists. B96.20 is a familiar example.

Two guardrails apply. The provider has to document the organism, because a coder shouldn’t pull it from a lab report alone. And these codes are supplemental, so they never replace the condition code.

Catheters, pregnancy, and sepsis

Each of these brings its own rules. An infection tied to an indwelling catheter may point to the T83.5 complication category, which has its own instruction for identifying the infection. Pregnancy and the postpartum period fall under obstetric chapter rules. Sepsis sequencing depends on the setting and the guidelines. None of it should be assumed from context, and none has a quick sequencing shortcut.

Common UTI Coding Errors

Assuming the site. A UTI with no site named is N39.0 territory, not cystitis by default.
Coding symptoms as a confirmed UTI, or coding a suspected UTI at an outpatient visit.
Skipping the exclusion note. Reporting N39.0 beside a specified site code without checking Excludes1.
Adding an organism the provider never documented.
Using the wrong fiscal year. An October 2026 encounter belongs to FY 2027, not FY 2026.
Inferring catheter association, pregnancy status, or severity that the note doesn’t state.

Coding Workflow and Claim Checklist

A practical workflow

Confirm the date of service and load the matching code set (FY 2026 with the April 1, 2026 update, or FY 2027).
Read the provider’s assessment, not only the problem list or lab results.
Decide whether the UTI is documented as confirmed or only suspected.
Look for a documented site or specified condition.
Search the Alphabetic Index, then verify in the Tabular List, including Excludes notes and use additional code notes.
Check for organism, catheter, pregnancy, or sepsis documentation without inferring any of them.
Query the provider if documentation conflicts or falls short, then review payer requirements before you submit.

Quick documentation checklist

☐ Date of service and care setting

☐ Diagnosis stated with certainty, not “possible” or “rule out”

☐ Site documented when known (bladder, kidney, urethra)

☐ Acuity and hematuria noted when relevant

☐ Organism stated by the provider

☐ Catheter, pregnancy, or sepsis status documented when it applies

☐ Provider query answered and filed

Illustrative Coding Examples

These are examples only. They aren’t medical advice and they aren’t real Care RCM client cases.

Example 1: Unspecified UTI

The assessment reads “UTI” with dysuria and a positive urinalysis. No site is named, so N39.0 fits. No organism code applies unless the provider documents one.

Example 2: Documented cystitis

The provider documents acute cystitis with hematuria. The site is named, so the coder works the cystitis family (N30.01) and checks the tabular notes rather than defaulting to N39.0.

Example 3: Suspected UTI

At an outpatient visit the note says “possible UTI, culture pending.” A suspected diagnosis isn’t coded as confirmed, so the coder reports the documented symptoms or findings and revisits coding if a later encounter confirms the diagnosis.

Frequently Asked Questions

N39.0 is the general code when the site isn't specified. If the provider documents a site or specified condition, a more specific code usually applies.
The provider confirmed a urinary tract infection but didn't say which part of the urinary tract is involved.
When the record documents cystitis, pyelonephritis, pyonephrosis, urethritis, or another specified condition. Check the tabular notes first, since N39.0 has an Excludes1 note for specified sites.
No. N39.0 has a use additional code note for B95 to B97, but the provider must document the organism and the tabular instruction for your code must support the addition.
Code sets follow the date of service. FY 2026 covers October 1, 2025 through September 30, 2026, with the April 1, 2026 update applying from April 1. Encounters on or after October 1, 2026 use FY 2027.

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Disclaimer: Denial rates, performance benchmarks, and revenue improvement figures referenced in this guide reflect publicly available information, industry research, and Care RCM professional RCM experience as of October 2026. Individual practice outcomes vary based on payer mix, specialty volume, existing billing infrastructure, and claim complexity. All CPT code, modifier, and compliance guidance reflects current CMS and AMA standards. Medical coding references are intended as general guidance only; specific coding and bundling rules should be verified with a qualified billing specialist for your practice.