ICD-10-CM 2027
ICD-10 code for bladder calculus
From the official ICD-10-CM alphabetic index entry “Calculus, calculi, calculous › bladder (encysted) (impacted) (urinary) (diverticulum)”. Page updated September 29, 2026.
About coding bladder calculus
The ICD-10-CM code for bladder calculus is N21.0 (Calculus in bladder).
Within N21 (calculus of lower urinary tract), N21.0 is specifically for calculus in bladder. Related codes cover calculus in urethra (N21.1), other lower urinary tract calculus (N21.8) and unspecified (N21.9).
The conditions in its Excludes2 note aren't part of N21.0, but may be coded alongside it if the patient has both: staghorn calculus (N20.0).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Common questions about bladder calculus ICD-10 codes
What is the ICD-10 code for bladder calculus?
- N21.0 — Calculus in bladder.
Is N21.0 billable?
- Yes. N21.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N21.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N21.0 as a principal diagnosis.
Is N21.0 a CC or MCC?
- No. N21.0 is neither a CC nor an MCC under MS-DRG v44.0.