ICD-10-CM 2027
ICD-10 code for ureter calculus
From the official ICD-10-CM alphabetic index entry “Calculus, calculi, calculous › ureter (impacted) (recurrent)”. Page updated September 29, 2026.
About coding ureter calculus
The ICD-10-CM code for ureter calculus is N20.1 (Calculus of ureter). The official index lists 5 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on N20.1.
Within N20 (calculus of kidney and ureter), N20.1 is specifically for calculus of ureter. Related codes cover calculus of kidney (N20.0), calculus of kidney with calculus of ureter (N20.2) and urinary calculus, unspecified (N20.9).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
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.
More specific ureter calculus codes (official index)
- with calculus, kidney N20.2 — Calculus of kidney with calculus of ureter
- with hydronephrosis N13.2 — Hydronephrosis with renal and ureteral calculous obstruction
- with infection N13.6 — Pyonephrosis
- with hydronephrosis N13.2 — Hydronephrosis with renal and ureteral calculous obstruction
- with infection N13.6 — Pyonephrosis
Common questions about ureter calculus ICD-10 codes
What is the ICD-10 code for ureter calculus?
- N20.1 — Calculus of ureter. More specific codes apply when the documentation supports them: N20.2, N13.2, N13.6, N13.2 and others below.
Is N20.1 billable?
- Yes. N20.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N20.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N20.1 as a principal diagnosis.
Is N20.1 a CC or MCC?
- N20.1 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.