ICD-10-CM 2027
ICD-10 code for ureter idiopathic dilatation
From the official ICD-10-CM alphabetic index entry “Dilatation › ureter (idiopathic)”. Page updated September 29, 2026.
About coding ureter idiopathic dilatation
The ICD-10-CM code for ureter idiopathic dilatation is N28.82 (Megaloureter). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on N28.82.
Within N28.8 (other specified disorders of kidney and ureter), N28.82 is specifically for Megaloureter. Related codes cover hypertrophy of kidney (N28.81), Nephroptosis (N28.83), Pyelitis cystica (N28.84), Pyeloureteritis cystica (N28.85), Ureteritis cystica (N28.86) and other specified disorders of kidney and ureter (N28.89).
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 698 (Other Kidney and Urinary Tract Diagnoses with MCC, relative weight 1.6398), DRG 699 (Other Kidney and Urinary Tract Diagnoses with CC, relative weight 1.0003) and DRG 700 (Other Kidney and Urinary Tract Diagnoses without CC/MCC, relative weight 0.6741), 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 idiopathic dilatation codes (official index)
Common questions about ureter idiopathic dilatation ICD-10 codes
What is the ICD-10 code for ureter idiopathic dilatation?
- N28.82 — Megaloureter. More specific codes apply when the documentation supports them: Q62.2, N13.4.
What is the ICD-10 code for congenital ureter idiopathic dilatation?
- Q62.2 — Congenital megaureter.
Is N28.82 billable?
- Yes. N28.82 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N28.82 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N28.82 as a principal diagnosis.
Is N28.82 a CC or MCC?
- No. N28.82 is neither a CC nor an MCC under MS-DRG v44.0.