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ICD-10 Guide
ICD-10 CodesO23.03

O23.03

Billable

Infections of kidney in pregnancy, third trimester

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/08/2025

Code Description

ICD-10 O23.03 is a billable code used to indicate a diagnosis of infections of kidney in pregnancy, third trimester.

Key Diagnostic Point:

Infections of the kidney during pregnancy, particularly in the third trimester, can pose significant risks to both the mother and fetus. These infections, often referred to as pyelonephritis, are typically caused by bacteria ascending from the lower urinary tract. Symptoms may include fever, flank pain, dysuria, and urinary urgency. In pregnant women, the physiological changes such as increased renal blood flow and altered urinary tract anatomy can predispose them to urinary tract infections (UTIs) and subsequent kidney infections. Prompt diagnosis and treatment are crucial to prevent complications such as preterm labor, low birth weight, and maternal sepsis. Management often involves the use of antibiotics that are safe for use during pregnancy, with careful consideration of the potential effects on fetal development. Regular prenatal care and monitoring are essential for early detection and intervention.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between types of urinary tract infections (UTIs) and their severity.
  • Understanding the implications of antibiotic safety during pregnancy.
  • Navigating the documentation requirements for high-risk pregnancies.
  • Recognizing the potential complications associated with kidney infections in pregnancy.

Audit Risk Factors

  • Inadequate documentation of symptoms and clinical findings.
  • Failure to specify the trimester of pregnancy.
  • Incorrect coding of the severity of the infection.
  • Lack of clarity on antibiotic treatment and its safety profile.

Specialty Focus

Medical Specialties

Obstetrics and Gynecology

Documentation Requirements

Documentation must include detailed clinical findings, treatment plans, and follow-up care.

Common Clinical Scenarios

A pregnant woman presenting with flank pain and fever, diagnosed with pyelonephritis.

Billing Considerations

Consideration of the impact of the infection on labor and delivery outcomes.

Maternal-Fetal Medicine

Documentation Requirements

Comprehensive documentation of maternal and fetal health status, including any complications.

Common Clinical Scenarios

Management of a high-risk pregnancy with a history of recurrent UTIs leading to kidney infections.

Billing Considerations

Monitoring for potential preterm labor and fetal distress due to maternal infection.

Coding Guidelines

Inclusion Criteria

Use O23.03 When
  • According to ICD
  • 10 coding guidelines, O23
  • 03 should be used when a pregnant patient is diagnosed with a kidney infection specifically in the third trimester
  • Coders must ensure that the diagnosis is supported by clinical documentation and that the trimester is clearly indicated

Exclusion Criteria

Do NOT use O23.03 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

99223CPT Code

Initial hospital care, typically for a patient with a kidney infection.

Clinical Scenario

Used when a pregnant patient is admitted for pyelonephritis.

Documentation Requirements

Detailed history, examination findings, and treatment plan must be documented.

Specialty Considerations

Obstetricians should ensure that the patient's pregnancy status is clearly documented.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of obstetric conditions, including kidney infections. This specificity helps in better tracking of maternal health outcomes and resource allocation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of obstetric conditions, including kidney infections. This specificity helps in better tracking of maternal health outcomes and resource allocation.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of obstetric conditions, including kidney infections. This specificity helps in better tracking of maternal health outcomes and resource allocation.

Resources

Clinical References

  • •
    CDC Guidelines on Antibiotic Use in Pregnancy

Coding & Billing References

  • •
    CDC Guidelines on Antibiotic Use in Pregnancy

Frequently Asked Questions

What are the common symptoms of kidney infections in pregnancy?

Common symptoms include fever, chills, flank pain, nausea, vomiting, and urinary symptoms such as dysuria and urgency. Prompt medical evaluation is essential.