2026 ICD-10-CM Diagnosis Code O86.21Infection of kidney following delivery

ICD-10-CM Codes›O00-O9A›O85-O92›O86

ICD-10-CM O86.21
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O86.21 is a billable ICD-10-CM diagnosis code for infection of kidney following delivery. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complications specified during the puerperium and Urinary tract infections.

Code Identity

ICD-10-CM Code
O86.21
Billable Status
Yes — Valid for Submission
Code Describes
Infection of kidney following delivery
Short Description
Infection of kidney following delivery
Same as the full description in the CMS dataset.
Parent Code
O86.2
Urinary tract infection following delivery

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO85-O92Complications predominantly related to the puerperium
CategoryO86Other puerperal infections
This CodeO86.21Infection of kidney following delivery

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O86.21.

Maternity diagnoses
The Medicare Code Editor detects inconsistencies in maternity cases by checking a patient's age and any diagnosis on the patient's record. The maternity code edits apply to patients age ange is 9–64 years inclusive (e.g., diabetes in pregnancy, antepartum pulmonary complication).

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • 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)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR PRG027
Complications specified during the puerperium
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR GEN004
Urinary tract infections
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Postpartum Care

Taking home a new baby is one of the happiest times in a woman's life. But it also presents both physical and emotional challenges. :

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert O86.21 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
646.64 Gu infection-postpartum
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About O86.21Overview

Is O86.21 (Urinary tract infection following delivery) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report infection of kidney following delivery on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Who can O86.21 be reported for?

The Medicare Code Editor checks infection of kidney following delivery against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.

What is the ICD-9 equivalent of O86.21?

Under the General Equivalence Mappings, infection of kidney following delivery converts to ICD-9-CM 646.64 (gu infection-postpartum). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.