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ICD-10 Guide
ICD-10 CodesO13.9

O13.9

Billable

Gestational [pregnancy-induced] hypertension without significant proteinuria, unspecified trimester

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

Code Description

ICD-10 O13.9 is a billable code used to indicate a diagnosis of gestational [pregnancy-induced] hypertension without significant proteinuria, unspecified trimester.

Key Diagnostic Point:

Gestational hypertension, also known as pregnancy-induced hypertension, is a condition characterized by elevated blood pressure that develops after 20 weeks of gestation in a previously normotensive woman. This condition is defined by systolic blood pressure readings of 140 mmHg or higher, or diastolic readings of 90 mmHg or higher, without the presence of significant proteinuria. It is crucial to monitor blood pressure regularly during prenatal visits to identify any elevations early. The absence of significant proteinuria distinguishes this condition from preeclampsia, which is a more severe form of hypertension during pregnancy. Management typically involves lifestyle modifications, close monitoring, and, in some cases, medication to control blood pressure. The unspecified trimester designation indicates that the diagnosis can occur at any point after the 20-week mark, necessitating careful documentation of the patient's blood pressure readings and any symptoms that may arise. Regular follow-up is essential to ensure maternal and fetal well-being.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between gestational hypertension and preeclampsia.
  • Monitoring and documenting blood pressure readings accurately.
  • Understanding the implications of unspecified trimester on care.
  • Recognizing the need for additional testing if symptoms develop.

Audit Risk Factors

  • Inadequate documentation of blood pressure readings.
  • Failure to specify the trimester of diagnosis.
  • Misclassification of gestational hypertension as preeclampsia.
  • Lack of follow-up documentation for ongoing management.

Specialty Focus

Medical Specialties

Obstetrics and Gynecology

Documentation Requirements

Documentation must include blood pressure readings, any symptoms, and the absence of proteinuria.

Common Clinical Scenarios

A patient presents with elevated blood pressure during a routine prenatal visit without proteinuria.

Billing Considerations

Ensure that all blood pressure readings are documented and that the patient is monitored for any signs of progression to preeclampsia.

Maternal-Fetal Medicine

Documentation Requirements

Detailed documentation of maternal and fetal monitoring, including any interventions.

Common Clinical Scenarios

A high-risk patient with a history of hypertension is monitored closely throughout her pregnancy.

Billing Considerations

Consider the implications of gestational hypertension on fetal growth and development, and document any additional testing performed.

Coding Guidelines

Inclusion Criteria

Use O13.9 When
  • Follow the official ICD
  • CM guidelines for coding hypertension in pregnancy, ensuring that the diagnosis is supported by clinical documentation and that the absence of proteinuria is clearly noted

Exclusion Criteria

Do NOT use O13.9 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

99213CPT Code

Established patient office visit, Level 3

Clinical Scenario

Used for routine prenatal visits where blood pressure is monitored.

Documentation Requirements

Document blood pressure readings, any symptoms, and management plans.

Specialty Considerations

Obstetricians should ensure that all relevant information is included in the visit notes.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of gestational hypertension, improving the accuracy of diagnoses and facilitating better patient management.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of gestational hypertension, improving the accuracy of diagnoses and facilitating better patient management.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of gestational hypertension, improving the accuracy of diagnoses and facilitating better patient management.

Resources

Clinical References

  • •
    American College of Obstetricians and Gynecologists (ACOG)

Coding & Billing References

  • •
    American College of Obstetricians and Gynecologists (ACOG)

Frequently Asked Questions

What is the difference between gestational hypertension and preeclampsia?

Gestational hypertension is characterized by high blood pressure without significant proteinuria, while preeclampsia involves high blood pressure with significant proteinuria and may present additional risks to both mother and fetus.