ICD-10-CM 2027
ICD-10 code for cystitis
From the official ICD-10-CM alphabetic index entry “Cystitis (exudative) (hemorrhagic) (septic) (suppurative)”. Page updated September 29, 2026.
About coding cystitis
The ICD-10-CM code for cystitis is N30.90 (Cystitis, unspecified without hematuria). The official index lists 34 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on N30.90.
Within N30.9, choose N30.90 (without hematuria) only when documentation doesn't support a more specific option: with hematuria (N30.91).
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 cystitis codes (official index)
- with
- fibrosis
- hematuria N30.91 — Cystitis, unspecified with hematuria
- leukoplakia
- malakoplakia
- metaplasia
- prostatitis N41.3 — Prostatocystitis
- acute N30.00 — Acute cystitis without hematuria
- with hematuria N30.01 — Acute cystitis with hematuria
- of trigone N30.30 — Trigonitis without hematuria
- with hematuria N30.31 — Trigonitis with hematuria
- allergic
- amebic A06.81 — Amebic cystitis
- bilharzial B65.9 — Schistosomiasis, unspecified
- blennorrhagic (gonococcal) A54.01 — Gonococcal cystitis and urethritis, unspecified
- bullous
- calculous N21.0 — Calculus in bladder
- chlamydial A56.01 — Chlamydial cystitis and urethritis
- chronic N30.20 — Other chronic cystitis without hematuria
- 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
- cystic (a)
- diphtheritic A36.85 — Diphtheritic cystitis
- echinococcal
- granulosus B67.39 — Echinococcus granulosus infection, other sites
- multilocularis B67.69 — Echinococcus multilocularis infection, other sites
- emphysematous
- encysted
- eosinophilic
- follicular
- gangrenous
- glandularis
- gonococcal A54.01 — Gonococcal cystitis and urethritis, unspecified
- incrusted
- interstitial (chronic)
- irradiation N30.40 — Irradiation cystitis without hematuria
- with hematuria N30.41 — Irradiation cystitis with hematuria
- irritation
- malignant
- of trigone N30.30 — Trigonitis without hematuria
- with hematuria N30.31 — Trigonitis with hematuria
- panmural
- polyposa
- prostatic N41.3 — Prostatocystitis
- puerperal (postpartum) O86.22 — Infection of bladder following delivery
- radiation
- specified type NEC N30.80 — Other cystitis without hematuria
- with hematuria N30.81 — Other cystitis with hematuria
- subacute
- submucous
- syphilitic (late) A52.76 — Other genitourinary symptomatic late syphilis
- trichomonal A59.03 — Trichomonal cystitis and urethritis
- tuberculous A18.12 — Tuberculosis of bladder
- ulcerative
Common questions about cystitis ICD-10 codes
What is the ICD-10 code for cystitis?
- N30.90 — Cystitis, unspecified without hematuria. More specific codes apply when the documentation supports them: N30.91, N41.3, N30.00, N30.01 and others below.
What is the ICD-10 code for acute cystitis?
- N30.00 — Acute cystitis without hematuria.
What is the ICD-10 code for amebic cystitis?
- A06.81 — Amebic cystitis.
What is the ICD-10 code for bilharzial cystitis?
- B65.9 — Schistosomiasis, unspecified.
What is the ICD-10 code for blennorrhagic cystitis?
- A54.01 — Gonococcal cystitis and urethritis, unspecified.
What is the ICD-10 code for calculous cystitis?
- N21.0 — Calculus in bladder.
What is the ICD-10 code for chlamydial cystitis?
- A56.01 — Chlamydial cystitis and urethritis.
Is N30.90 billable?
- Yes. N30.90 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N30.90 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N30.90 as a principal diagnosis.
Is N30.90 a CC or MCC?
- No. N30.90 is neither a CC nor an MCC under MS-DRG v44.0.