ICD10

ICD-10 Code N30.0: Acute cystitis

N30.0 is an ICD-10 diagnosis entry used to group records related to Acute cystitis. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the genitourinary system (N00-N99).

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the genitourinary system (N00-N99).

đź“‹Clinical overview

This ICD-10 code is commonly used when documentation describes a urinary tract infection, cystitis, or kidney-infection context. The most accurate code depends on the documented site of infection, whether it is limited to the bladder or extends to the kidney, and how specific the record is.

When is it used?

  • May be used when a clinician documents acute cystitis in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
  • This entry may represent a broader category rather than the most specific billable code.

🩺Clinical context

When commonly used
  • Urgent care, primary care, emergency, and inpatient documentation where dysuria, bladder infection, or pyelonephritis is part of the active encounter.
  • Coding, utilization review, and follow-up workflows where infection site, recurrence, catheter context, or kidney involvement changes the final diagnosis detail.
Common management context
  • UTI evaluation often includes symptom review, urinalysis, urine culture context, hydration guidance, and antimicrobial treatment planning.
  • Documentation usually becomes more specific when the chart identifies cystitis, pyelonephritis, hematuria, catheter association, recurrence, pregnancy context, or another complicating factor.
  • Specialist context already linked on this page includes Urologist, Gynecologist.

🔍Key distinctions

Important notes
  • Broad urinary-tract-infection codes are often placeholders for lower-tract or site-unspecified infection; more specific coding may be available when the chart clearly identifies bladder or kidney involvement.
  • Kidney infection, catheter-associated infection, recurrent infection, and organism-specific documentation can all affect ICD-10 code specificity.
  • Cystitis documentation usually points to bladder involvement; added detail such as hematuria, recurrent infection, or organism findings may change code specificity.
Important exclusions
  • irradiation cystitis (N30.4-)
  • trigonitis (N30.3-)
Related codes to consider
N30.00Acute cystitis without hematuria
Related urinary-infection ICD-10 code; documentation often becomes more specific when the chart identifies bladder, kidney, or site-unspecified infection detail.
N30.01Acute cystitis with hematuria
Related urinary-infection ICD-10 code; documentation often becomes more specific when the chart identifies bladder, kidney, or site-unspecified infection detail.

Code hierarchy

chapter
14Diseases of the genitourinary system (N00-N99)
block
N30-N39Other diseases of the urinary system
category
N30Cystitis
currentN30

Official coding notes

Excludes1 (do not code together)
  • irradiation cystitis (N30.4-)
  • trigonitis (N30.3-)

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

UrologistGynecologist

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.
Legacy codes
N30.0
Replacement codes
N30.00 — Acute cystitis without hematuriaN30.01 — Acute cystitis with hematuria

Common synonyms

Acute cystitis

Frequently asked questions

Code details

CodeN30.0
SystemICD10
Display nameAcute cystitis
ChapterDiseases of the genitourinary system (N00-N99)
BlockOther diseases of the urinary system

Flags

BillableNo
Valid clinical useNo

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.

ICD-10 Code N30.0 for Acute cystitis | HealthAssure