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ICD-10 Guide
ICD-10 CodesO01.9

O01.9

Billable

Hydatidiform mole, unspecified

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

Code Description

ICD-10 O01.9 is a billable code used to indicate a diagnosis of hydatidiform mole, unspecified.

Key Diagnostic Point:

A hydatidiform mole, also known as a molar pregnancy, is a gestational trophoblastic disease characterized by abnormal growth of trophoblastic tissue, which can lead to the formation of a mass resembling a cluster of grapes. This condition can be classified into complete and partial moles, but when unspecified, it indicates that the specific type has not been determined. Patients may present with symptoms such as vaginal bleeding, uterine enlargement, and elevated levels of human chorionic gonadotropin (HCG). The risk of developing choriocarcinoma, a malignant form of gestational trophoblastic neoplasia, is a significant concern, particularly in cases of complete moles. Regular monitoring of HCG levels is crucial for detecting persistent trophoblastic disease and ensuring appropriate follow-up care. Management typically involves evacuation of the mole through suction curettage, and ongoing surveillance of HCG levels is essential to rule out malignancy. Accurate coding of this condition is vital for proper treatment and follow-up, as well as for understanding the potential complications associated with molar pregnancies.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiation between complete and partial moles
  • Monitoring for potential malignancy (choriocarcinoma)
  • Need for accurate HCG level tracking
  • Variability in clinical presentation

Audit Risk Factors

  • Inadequate documentation of HCG levels
  • Failure to specify the type of hydatidiform mole
  • Lack of follow-up care documentation
  • Misclassification of molar pregnancy as a normal pregnancy

Specialty Focus

Medical Specialties

Obstetrics and Gynecology

Documentation Requirements

Documentation must include details of the patient's symptoms, HCG levels, and any imaging studies performed. Clear notes on the management plan and follow-up care are essential.

Common Clinical Scenarios

Patients presenting with vaginal bleeding in early pregnancy, abnormal ultrasound findings, or significantly elevated HCG levels.

Billing Considerations

Coders must ensure that all relevant clinical details are captured to avoid misclassification and ensure appropriate reimbursement.

Maternal-Fetal Medicine

Documentation Requirements

High-risk pregnancy documentation must include comprehensive assessments of maternal and fetal health, as well as detailed monitoring plans.

Common Clinical Scenarios

Complex cases involving multiple gestations or previous history of molar pregnancies.

Billing Considerations

Attention to maternal-fetal interactions and potential complications is critical for accurate coding.

Coding Guidelines

Inclusion Criteria

Use O01.9 When
  • According to the official ICD
  • 10 coding guidelines, coders should ensure that the diagnosis is supported by clinical documentation, including the type of mole when known, and any associated complications
  • HCG monitoring should be documented to support ongoing care

Exclusion Criteria

Do NOT use O01.9 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

58150CPT Code

Dilation and curettage, aspiration curettage

Clinical Scenario

Used for the surgical management of hydatidiform mole.

Documentation Requirements

Documentation must include indications for the procedure and any complications encountered.

Specialty Considerations

Obstetricians should document the patient's history and any follow-up care plans.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of hydatidiform moles, improving the ability to track and manage these conditions effectively. The granularity of ICD-10 codes helps in understanding the prevalence and outcomes of molar pregnancies.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of hydatidiform moles, improving the ability to track and manage these conditions effectively. The granularity of ICD-10 codes helps in understanding the prevalence and outcomes of molar pregnancies.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of hydatidiform moles, improving the ability to track and manage these conditions effectively. The granularity of ICD-10 codes helps in understanding the prevalence and outcomes of molar pregnancies.

Resources

Clinical References

  • •
    Gestational Trophoblastic Disease: A Guide for Patients and Families

Coding & Billing References

  • •
    Gestational Trophoblastic Disease: A Guide for Patients and Families

Frequently Asked Questions

What is the significance of monitoring HCG levels in patients with hydatidiform mole?

Monitoring HCG levels is crucial in patients with hydatidiform mole to ensure that the trophoblastic tissue is completely removed and to detect any potential malignant transformation into choriocarcinoma. Elevated HCG levels post-treatment may indicate persistent disease, necessitating further intervention.