ICD-10 Code for Pyelonephritis

The ICD-10-CM 2027 alphabetic index lists pyelonephritis with the subterms below. More specific codes depend on the details documented, as listed in the official index (24 codes, 22 billable).

Index entries for Pyelonephritis

with
- calculus
  - with hydronephrosis – N13.6
- contracted kidney – N11.9
acute – N10
calculous
- with hydronephrosis – N13.6
chronic – N11.9
- with calculus
  - with hydronephrosis – N13.6
- associated with ureteral obstruction or stricture – N11.1
- nonobstructive – N11.8
  - with reflux (vesicoureteral) – N11.0
- obstructive – N11.1
- specified NEC – N11.8
in (due to)
- brucellosis – A23.9 – N16 [manifestation]
- cryoglobulinemia (mixed) – D89.1 – N16 [manifestation]
- cystinosis – E72.04
- diphtheria – A36.84
- glycogen storage disease – E74.09 – N16 [manifestation]
- leukemia NEC – C95.9- (header) – N16 [manifestation]
- lymphoma NEC – C85.90 – N16 [manifestation]
- multiple myeloma – C90.0- (header) – N16 [manifestation]
- obstruction – N11.1
- Salmonella infection – A02.25
- sarcoidosis – D86.84
- sepsis – A41.9 – N16 [manifestation]
- Sjögren's disease – M35.04
- toxoplasmosis – B58.83
- transplant rejection – T86.91 – N16 [manifestation]
- Wilson's disease – E83.01 – N16 [manifestation]
nonobstructive – N12
- with reflux (vesicoureteral) – N11.0
- chronic – N11.8
syphilitic – A52.75

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.