ICD-10-CM diagnosis code
N13.2 Hydronephrosis with renal and ureteral calculous obstruction
- Billable
- Yes, a complete code (FY2026)
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Other codes in N13
18 complete codes in this category.
- N13.0Hydronephrosis with ureteropelvic junction obstruction
- N13.1Hydronephrosis with ureteral stricture, not elsewhere classified
- N13.2Hydronephrosis with renal and ureteral calculous obstruction
- N13.30Unspecified hydronephrosis
- N13.39Other hydronephrosis
- N13.4Hydroureter
- N13.5Crossing vessel and stricture of ureter without hydronephrosis
- N13.6Pyonephrosis
- N13.70Vesicoureteral-reflux, unspecified
- N13.71Vesicoureteral-reflux without reflux nephropathy
- N13.721Vesicoureteral-reflux with reflux nephropathy without hydroureter, unilateral
- N13.722Vesicoureteral-reflux with reflux nephropathy without hydroureter, bilateral
Documentation tips
- Make sure the note supports every element of the title, “Hydronephrosis with renal and ureteral calculous obstruction”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to N13.
The international WHO ICD-10 also has N13.2, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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