N20.9 Urinary calculus, unspecified

Billable ICD-10-CM code, FY2026.

Applies from N20 Calculus of kidney and ureter

Applicable to

• Calculous pyelonephritis

Excludes1 (never code together)

• nephrocalcinosis (E83.59)
• that with hydronephrosis (N13.2)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 592.9 Urinary calculus, unspecified (approximate)

Code annotations containing back-references to N20.9

Back-references to N20.9

• Type 1 Excludes: N11.1 Chronic obstructive pyelonephritis ("calculous pyelonephritis (N20.9)")
• Type 1 Excludes: N12 Tubulo-interstitial nephritis, not specified as acute or chronic ("calculous pyelonephritis (N20.9)")
• Type 1 Excludes: N21.9 Calculus of lower urinary tract, unspecified ("calculus of urinary tract NOS (N20.9)")

Back-references to N20

• Type 2 Excludes: N13 Obstructive and reflux uropathy ("calculus of kidney and ureter without hydronephrosis (N20.-)")

Diagnosis Index entries for N20.9

• Anuria › calculous (impacted) (recurrent)
• Calculus, calculi, calculous › anuria (impacted) (recurrent)
• Calculus, calculi, calculous › urinary (duct) (impacted) (passage) (tract)
• Stone (s) › urinary (duct) (impacted) (passage)

Nearby codes

• N20 Calculus of kidney and ureter
• N20.0 Calculus of kidney
• N20.1 Calculus of ureter
• N20.2 Calculus of kidney with calculus of ureter
• N20.9 Urinary calculus, unspecified (this code)