N21.0

ICD-10Billable

Calculus in bladder

Official ICD-10-CM descriptor (FY2026)

Calculus in bladder

N21.0 is valid for submission on a claim — CMS flags it as a billable, specific code.

Inclusion terms

  • Calculus in diverticulum of bladder
  • Urinary bladder stone

Excludes2

Not included here. The condition is not part of this code, but a patient may have both, and both codes may be reported together.

  • staghorn calculus (N20.0)

Related codes in N21

Where this code sits

Parent code
N21

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Source

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.

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