N21.0

Calculus in bladder

Billable FY2026 2025-10-01 → 2026-09-30

Exclusions 9 never code together

Excludes2

Excludes2

certain conditions originating in the perinatal period (P04-P96)P04-P96
certain infectious and parasitic diseases (A00-B99)A00-B99
complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)Q00-Q99
endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
neoplasms (C00-D49)C00-D49
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94

Excludes2 — not included here, but the patient may have both. Code both when documented.

Instructional notes 3

N21code

Includes

Inclusion terms

Index entries leading here 4

Calculus, calculi, calculous
- diverticulum
  - bladder N21.0
- bladder (encysted) (impacted) (urinary) (diverticulum) N21.0
- vesical (impacted) N21.0
- cystic N21.0
Stone (s) — see also Calculus
- bladder (diverticulum) N21.0
- urinary (duct) (impacted) (passage) N20.9
  - bladder (diverticulum) N21.0
Cystitis (exudative) (hemorrhagic) (septic) (suppurative) N30.90
- calculous N21.0
Cystolithiasis N21.0

Alongside this code 3 same parent — N21

Additional references

AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Maps to no condition category in any loaded model.

Presence is a property of the code. Untick a model to hide it everywhere.

Present FY2024–FY2027.