N21.8 Other lower urinary tract calculus

Billable ICD-10-CM code, FY2026.

Applies from N21 Calculus of lower urinary tract

Includes

• calculus of lower urinary tract with cystitis and urethritis

MS-DRG index

Defines the logic of DRG(s) 693-694 in MDC 11.

Approximate ICD-9-CM (GEMs)

• 594.8 Other lower urinary tract calculus

Diagnosis Index entries for N21.8

• Calculus, calculi, calculous › ileal conduit
• Calculus, calculi, calculous › suburethral
• Calculus, calculi, calculous › urinary (duct) (impacted) (passage) (tract) › lower › specified NEC
• Stone (s) › urinary (duct) (impacted) (passage) › specified NEC

Nearby codes

• N21 Calculus of lower urinary tract
• N21.0 Calculus in bladder
• N21.1 Calculus in urethra
• N21.8 Other lower urinary tract calculus (this code)
• N21.9 Calculus of lower urinary tract, unspecified