ICD-10-CM 2027
ICD-10 code for calculous urethritis
From the official ICD-10-CM alphabetic index entry “Urethritis (anterior) (posterior) › calculous”. Page updated September 29, 2026.
About coding calculous urethritis
The ICD-10-CM code for calculous urethritis is N21.1 (Calculus in urethra).
Within N21 (calculus of lower urinary tract), N21.1 is specifically for calculus in urethra. Related codes cover calculus in bladder (N21.0), other lower urinary tract calculus (N21.8) and unspecified (N21.9).
The conditions in its Excludes2 note aren't part of N21.1, but may be coded alongside it if the patient has both: calculus of prostate (N42.0).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Common questions about calculous urethritis ICD-10 codes
What is the ICD-10 code for calculous urethritis?
- N21.1 — Calculus in urethra.
Is N21.1 billable?
- Yes. N21.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N21.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N21.1 as a principal diagnosis.
Is N21.1 a CC or MCC?
- No. N21.1 is neither a CC nor an MCC under MS-DRG v44.0.