N30
ICD-10Non-billable categoryCystitis
Official ICD-10-CM descriptor (FY2026)
Cystitis
N30 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- prostatocystitis (N41.3)
Use additional code
Report an additional code to identify the associated condition.
- code to identify infectious agent (B95-B97)
More specific codes under N30
Where this code sits
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.