N21.9 Calculus of lower urinary tract, unspecified

Billable ICD-10-CM code, FY2026.

Excludes1 (never code together)

• calculus of urinary tract NOS (N20.9)

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)

• 594.9 Calculus of lower urinary tract, unspecified

Diagnosis Index entries for N21.9

• Calculus, calculi, calculous › urinary (duct) (impacted) (passage) (tract) › lower
• Stone (s) › urinary (duct) (impacted) (passage) › lower tract

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
• N21.9 Calculus of lower urinary tract, unspecified (this code)