N11.1 vs N13
N11.1 and N13 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on N11.1
obstructive uropathy (N13.-)
N11.1
Chronic obstructive pyelonephritis
Billable
- Chapter 14
- Diseases of the genitourinary system
- Section
- N10-N16
Use when the record says
- Pyelonephritis (chronic) associated with anomaly of pelviureteric junction
- Pyelonephritis (chronic) associated with anomaly of pyeloureteric junction
- Pyelonephritis (chronic) associated with crossing of vessel
- Pyelonephritis (chronic) associated with kinking of ureter
- Pyelonephritis (chronic) associated with obstruction of ureter
- Pyelonephritis (chronic) associated with stricture of pelviureteric junction
- Pyelonephritis (chronic) associated with stricture of ureter
Indexed under
- Pyelonephrosis (obstructive)
- Obstruction, obstructed, obstructive › pyelonephritis
- Pyelonephritis › chronic › associated with ureteral obstruction or stricture
- Pyelonephritis › chronic › obstructive
- Pyelonephritis › in › obstruction
N13
Obstructive and reflux uropathy
Not billable
- Chapter 14
- Diseases of the genitourinary system
- Section
- N10-N16
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027