ICD-10-CM 2027
ICD-10 code for acute cystitis
From the official ICD-10-CM alphabetic index entry “Cystitis (exudative) (hemorrhagic) (septic) (suppurative) › acute”. Page updated September 29, 2026.
About coding acute cystitis
The ICD-10-CM code for acute cystitis is N30.00 (Acute cystitis without hematuria). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on N30.00.
Within N30.0, choose N30.00 (without hematuria) only when documentation doesn't support a more specific option: with hematuria (N30.01).
Use an additional code to identify infectious agent (B95-B97).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
More specific acute cystitis codes (official index)
Common questions about acute cystitis ICD-10 codes
What is the ICD-10 code for acute cystitis?
- N30.00 — Acute cystitis without hematuria. More specific codes apply when the documentation supports them: N30.01, N30.30, N30.31.
Is N30.00 billable?
- Yes. N30.00 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N30.00 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N30.00 as a principal diagnosis.
Is N30.00 a CC or MCC?
- N30.00 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.