O86.21 Infection of kidney following delivery

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from O86 Other puerperal infections

Excludes2 (not included here)

• infection during labor (O75.3)
• obstetrical tetanus (A34)

Use additional code

• code (B95-B97), to identify infectious agent

MS-DRG index

Defines the logic of DRG(s) 769 in MDC 14.

Approximate ICD-9-CM (GEMs)

• 646.64 Infections of genitourinary tract in pregnancy, postpartum condition or complication (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Maternity diagnoses (age 9 through 64): Age conflict edit. These diagnoses are clinically expected only in patients age 9 through 64.

Code annotations containing back-references to O86.21

Back-references to O86.2

• Type 2 Excludes: O85 Puerperal sepsis ("urinary tract infection following delivery (O86.2-)")
• Type 2 Excludes: O99.8 Other specified diseases and conditions complicating pregnancy, childbirth and the puerperium ("infection of genitourinary tract following delivery (O86.1-O86.4)")

Back-references to O86

• Type 1 Excludes: N71 Inflammatory disease of uterus, except cervix ("infection of uterus following delivery (O85, O86.-)")
• Type 2 Excludes: O75 Other complications of labor and delivery, not elsewhere classified ("puerperal (postpartum) infection (O86.-)")
• Type 2 Excludes: O98 Maternal infectious and parasitic diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium ("puerperal infection (O86.-)")

Diagnosis Index entries for O86.21

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

Nearby codes

• O86.12 Endometritis following delivery
• O86.13 Vaginitis following delivery
• O86.19 Other infection of genital tract following delivery
• O86.2 Urinary tract infection following delivery
• O86.20 Urinary tract infection following delivery, unspecified
• O86.21 Infection of kidney following delivery (this code)
• O86.22 Infection of bladder following delivery
• O86.29 Other urinary tract infection following delivery
• O86.4 Pyrexia of unknown origin following delivery
• O86.8 Other specified puerperal infections
• O86.81 Puerperal septic thrombophlebitis