ICD-10-CM 2027
ICD-10 code for kidney stone
From the official ICD-10-CM alphabetic index entry “Stone (s) › kidney”. Page updated September 29, 2026.
About coding kidney stone
The ICD-10-CM code for kidney stone is N20.0 (Calculus of kidney).
Within N20 (calculus of kidney and ureter), N20.0 is specifically for calculus of kidney. Related codes cover calculus of ureter (N20.1), calculus of kidney with calculus of ureter (N20.2) and urinary calculus, unspecified (N20.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 693 (Urinary Stones with MCC, relative weight 1.3168) and DRG 694 (Urinary Stones without MCC, relative weight 0.7815), in MDC 11 (Diseases and Disorders of the Kidney and Urinary Tract), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about kidney stone ICD-10 codes
What is the ICD-10 code for kidney stone?
- N20.0 — Calculus of kidney.
Is N20.0 billable?
- Yes. N20.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N20.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N20.0 as a principal diagnosis.
Is N20.0 a CC or MCC?
- No. N20.0 is neither a CC nor an MCC under MS-DRG v44.0.