ICD-10-CM 2027
ICD-10 code for Pericystitis
From the official ICD-10-CM alphabetic index entry “Pericystitis”. Page updated September 29, 2026.
About coding Pericystitis
The ICD-10-CM code for Pericystitis is N30.90 (Cystitis, unspecified without hematuria). The official index lists 1 more specific code, 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 Pericystitis codes (official index)
- with hematuria N30.91 — Cystitis, unspecified with hematuria
Common questions about Pericystitis ICD-10 codes
What is the ICD-10 code for Pericystitis?
- N30.90 — Cystitis, unspecified without hematuria. More specific codes apply when the documentation supports them: N30.91.
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.