ICD-10-CM > N00-N99 > N10-N16 > N13 > N13.3 N13.3 Other and unspecified hydronephrosis Non-Billable/Non-Specific Type 1 Excludes hydronephrosis with infection (N13.6) Codes N13.30Unspecified hydronephrosisN13.39Other hydronephrosis