O86.21 Infection of kidney following delivery

The ICD-10-CM code for Infection of kidney following delivery is O86.21 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

15: Pregnancy, childbirth and the puerperium (O00-O9A)

Section

O85-O92: Complications predominantly related to the puerperium (O85-O92)

Category O86

22 codes (17 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to O86.21:

• Pyelitis (congenital) (uremic) › puerperal (postpartum)
• Puerperal, puerperium (complicated by, complications) › perinephritis
• Puerperal, puerperium (complicated by, complications) › pyelitis
• Puerperal, puerperium (complicated by, complications) › pyonephritis
• Puerperal, puerperium (complicated by, complications) › pyelonephritis
• Puerperal, puerperium (complicated by, complications) › pyelonephrosis
• Infection, infected, infective (opportunistic) › kidney (cortex) (hematogenous) › puerperal (postpartum)
• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › kidney › puerperal (postpartum)

U.S. Hospital Utilization

• An estimated 1,880 U.S. inpatient stays in 2023 included O86.21 among the documented diagnoses.
• 940 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)