ICD-10-CM 2027
ICD-10 code for kidney stones
Confirmed by the official ICD-10-CM index entry “abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › kidney › with calculus”. Page updated September 29, 2026.
About coding kidney stones
The ICD-10-CM code for kidney stones is N20.0 (Calculus of kidney). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on N20.0.
It is also searched as nephrolithiasis, renal calculi.
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.
Related Kidney stones codes
Common questions about kidney stones ICD-10 codes
What is the ICD-10 code for kidney stones?
- N20.0 — Calculus of kidney. More specific codes apply when the documentation supports them: N20.1, N20.2, N20.9.
What is the ICD-10 code for calculus of ureter?
- N20.1 — Calculus of ureter.
What is the ICD-10 code for calculus of kidney with calculus of ureter?
- N20.2 — Calculus of kidney with calculus of ureter.
What is the ICD-10 code for urinary calculus, unspecified?
- N20.9 — Urinary calculus, unspecified.
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.