N13.0
Hydronephrosis with ureteropelvic junction obstruction
N13.0 (also written N130) is a billable ICD-10-CM diagnosis code for hydronephrosis with ureteropelvic junction obstruction. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 18 codes in category N13 (Obstructive and reflux uropathy). The Alphabetic Index lists it under 5 entries. Its coding notes include 1 Excludes1 entry and 13 Excludes2 entries.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
- Hydronephrosis with ureteropelvic junction obstruction due to calculus (N13.2)
Also from chapter/block level (8 notes)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Home Health Primary
Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the MMTA - Gastrointestinal tract and Genitourinary system clinical group.
Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026Hospital CC
Counts as a complication or comorbidity (CC) when reported as a secondary diagnosis on an inpatient claim. It does not count when the principal diagnosis is one of the 226 codes in its exclusion list. Some MS-DRGs also ignore a CC or MCC that defines the DRG.
Source: CMS MS-DRG Definitions Manual v44, effective October 1, 2026, Appendix CIncludes
Further defines or gives examples of the content of the category.
Also from chapter/block level (1 note)
- pyelonephritis
Inclusion terms
Conditions classified to this code.
- Hydronephrosis due to acquired occlusion of ureteropelvic junction
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 5 entries
- Hydronephrosis (atrophic) (early) (functionless) (intermittent) (primary) (secondary) NEC, congenital, due to acquired occlusion of ureteropelvic junction
- Hydronephrosis (atrophic) (early) (functionless) (intermittent) (primary) (secondary) NEC, with, obstruction (by) (of), ureteropelvic junction (congenital), acquired
- Obstruction, obstructed, obstructive, pelviureteral junction, with hydronephrosis
- Stricture, pelviureteric junction (congenital), acquired, with hydronephrosis
- Stricture, ureteropelvic junction (congenital), acquired, with hydronephrosis