ICD-10-CM 2027
ICD-10 code for Pyonephritis puerperal
Infection of kidney following delivery
From the official ICD-10-CM alphabetic index entry “Puerperal, puerperium (complicated by, complications) › pyonephritis”. Page updated September 29, 2026.
About coding Pyonephritis puerperal
The ICD-10-CM code for Pyonephritis puerperal is O86.21 (Infection of kidney following delivery).
Within O86.2 (urinary tract infection following delivery), O86.21 is specifically for infection of kidney following delivery. Related codes cover unspecified (O86.20), infection of bladder following delivery (O86.22) and other urinary tract infection following delivery (O86.29).
Use an additional code (B95-B97), to identify infectious agent.
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
Common questions about Pyonephritis puerperal ICD-10 codes
What is the ICD-10 code for Pyonephritis puerperal?
- O86.21 — Infection of kidney following delivery.
Is O86.21 billable?
- Yes. O86.21 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can O86.21 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict O86.21 as a principal diagnosis.
Is O86.21 a CC or MCC?
- O86.21 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.