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ICD-10 Code N39.0

Urinary tract infection, site not specified

What is the code N39.0?

N39.0 is the ICD-10-CM code used to identify and classify urinary tract infections (UTIs), a common condition affecting the urinary system. This code is utilized by healthcare providers to document and bill for services related to the diagnosis and treatment of UTIs.

Detailed description of N39.0

The ICD-10-CM code N39.0 specifically refers to urinary tract infections, site not specified. UTIs are infections that can affect any part of the urinary system, including the kidneys, ureters, bladder, and urethra. The term "site not specified" indicates that the exact location of the infection within the urinary tract is not detailed in the diagnosis.

Symptoms commonly associated with N39.0

Common symptoms of UTIs associated with N39.0 include:

  • A strong, persistent urge to urinate
  • A burning sensation when urinating
  • Passing frequent, small amounts of urine
  • Cloudy or strong-smelling urine
  • Pelvic pain in women, especially in the center of the pelvis and around the area of the pubic bone
  • Blood in the urine (hematuria)

Related and similar ICD-10 codes to N39.0 include:

  • N30.00: Acute cystitis without hematuria
  • N30.01: Acute cystitis with hematuria
  • N30.90: Cystitis, unspecified without hematuria
  • N30.91: Cystitis, unspecified with hematuria
  • N10: Acute pyelonephritis
  • N34.1: Nonspecific urethritis

Appropriate usage of N39.0 for billing

When using N39.0 for billing, it is important to ensure the diagnosis is well-documented in the patient's medical record. The code should be used when the urinary tract infection is confirmed, and the specific site of the infection is not identified. This code is appropriate for billing services such as office visits, laboratory tests, and treatments related to UTIs.

Instructional guidelines for coding N39.0

Best practices for coding with N39.0 include:

  • Ensure accurate and complete documentation of the patient's symptoms and diagnosis.
  • Confirm that the diagnosis meets the criteria for N39.0, and that the site of the infection is not specified.
  • Use additional codes to identify the presence of any associated conditions or complications, such as hematuria.  

There is an Excludes 1 note found at Category N39 Other disorders of the urinary system for the following conditions:

  • Candidiasis of urinary tract (B37.4-)
  • Neonatal urinary tract infection (P39.3)

Urinary tract infection of specified site, such as:

  • Cystitis (N30.-)
  • Urethritis (N34.-)

Due to this instructional note, when the urinary tract infection is more specifically one of the listed conditions, only the condition noted in the Excludes 1 note should be assigned and N39.0 would be omitted.

There is an Excludes 1 note found at Category N39 Other disorders of the urinary system for pyuria (R82.81). This instructional note indicates that R82.81 pyuria should not be assigned as an additional code if the patient has more specifically been diagnosed with a UTI. This note also indicates that codes within this category should not be assigned if the documented diagnosis is pyuria alone without indication of a confirmed urinary tract infection. In that case, assignment of N39.0 would not be appropriate.

There is an Use additional code (B95-B97), to identify infectious agent instructional note found category N39 Other disorders of the urinary system. This note indicates that if the organism causing the UTI has been specified an additional code to identify the organism should be assigned.

Common pitfalls in coding with N39.0

Common pitfalls to avoid when coding with N39.0 include:

  • Using the code for conditions that do not meet the criteria for a urinary tract infection.
  • Failing to document the diagnosis thoroughly, which can lead to claim denials.
  • Overlooking related symptoms or conditions that may require additional coding.

Key resources for N39.0 coding


ICD-10 code N39.0 is used to document and bill for urinary tract infections when the site of the infection is not specified. Accurate coding and thorough documentation ensure appropriate billing and reimbursement. By following best practices and guidelines, healthcare providers can effectively manage and code for UTIs, contributing to better patient outcomes and streamlined healthcare operations.

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