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  2. ICD-10-CM Codes List
  3. N00–N99
  4. N30-N39
  5. Cystitis (N30)

Cystitis (N30)

The ICD-10 codes in the N30 section are specifically used to classify different types of cystitis, which is inflammation of the urinary bladder. These codes help distinguish between acute, chronic, interstitial, irradiation-related, trigonitis forms of cystitis, and whether hematuria (blood in urine) is present.

The ICD-10 code for cystitis and its subcategories guide diagnosis and billing by addressing the exact type, such as acute cystitis without hematuria (N30.00), known also as acute bacterial simple cystitis or acute lower urinary tract infection. When hematuria occurs with cystitis, like in N30.01, it indicates blood presence, labeled hemorrhagic or acute hemorrhagic cystitis. Chronic forms include interstitial cystitis (N30.1), which may be ulcerative or present with fibrosis, sometimes with hematuria (N30.11). Other chronic or unspecified cystitis codes (N30.2, N30.9) cover recurring infections, irradiation-induced cystitis (N30.4), and trigonitis (N30.3). Knowledge of these synonyms and subtypes helps medical coders accurately assign the correct ICD-10 code reflecting the patient's condition, including the presence or absence of urinary bleeding. This detailed classification ensures precision in documenting urinary tract infections and related bladder inflammations.

Instructional Notations

Use Additional Code

The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.

  • code to identify infectious agent B95 B97

Type 1 Excludes

A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

Cystitis

Inflammation of the URINARY BLADDER, either from bacterial or non-bacterial causes. Cystitis is usually associated with painful urination (dysuria), increased frequency, urgency, and suprapubic pain.

Cystitis, Hemorrhagic

A diffuse inflammation of the URINARY BLADDER characterized by HEMATURIA due to bleeding from the bladder mucosa. Hemorrhagic cystitis is most often associated with infections, e.g., HUMAN ADENOVIRUS INFECIONS, but may also be due to other noninfectious etiologies: CHEMOTHERAPY with certain drugs, e.g., CYCLOPHOSPHAMIDE and IFOSFAMIDE, and RADIOTHERAPY.

Cystitis, Interstitial

A condition with recurring discomfort or pain in the URINARY BLADDER and the surrounding pelvic region without an identifiable disease. Severity of pain in interstitial cystitis varies greatly and often is accompanied by increased urination frequency and urgency.

Urinary Bladder

A musculomembranous sac along the URINARY TRACT. URINE flows from the KIDNEYS into the bladder via the ureters (URETER), and is held there until URINATION.