ICD-10-CM 2027
ICD-10 code for chronic cystitis
From the official ICD-10-CM alphabetic index entry “Cystitis (exudative) (hemorrhagic) (septic) (suppurative) › chronic”. Page updated September 29, 2026.
About coding chronic cystitis
The ICD-10-CM code for chronic cystitis is N30.20 (Other chronic cystitis without hematuria). The official index lists 7 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on N30.20.
Within N30.2, choose N30.20 (without hematuria) only when documentation doesn't support a more specific option: with hematuria (N30.21).
Use an additional code to identify infectious agent (B95-B97).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific chronic cystitis codes (official index)
- with hematuria N30.21 — Other chronic cystitis with hematuria
- interstitial N30.10 — Interstitial cystitis (chronic) without hematuria
- with hematuria N30.11 — Interstitial cystitis (chronic) with hematuria
- of trigone N30.30 — Trigonitis without hematuria
- with hematuria N30.31 — Trigonitis with hematuria
- specified NEC N30.20 — Other chronic cystitis without hematuria
- with hematuria N30.21 — Other chronic cystitis with hematuria
Common questions about chronic cystitis ICD-10 codes
What is the ICD-10 code for chronic cystitis?
- N30.20 — Other chronic cystitis without hematuria. More specific codes apply when the documentation supports them: N30.21, N30.10, N30.11, N30.30 and others below.
What is the ICD-10 code for interstitial chronic cystitis?
- N30.10 — Interstitial cystitis (chronic) without hematuria.
Is N30.20 billable?
- Yes. N30.20 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N30.20 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N30.20 as a principal diagnosis.
Is N30.20 a CC or MCC?
- No. N30.20 is neither a CC nor an MCC under MS-DRG v44.0.