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ICD-10 Guide
ICD-10 CodesC57.21

C57.21

Billable

Malignant neoplasm of right round ligament

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/05/2025

Code Description

ICD-10 C57.21 is a billable code used to indicate a diagnosis of malignant neoplasm of right round ligament.

Key Diagnostic Point:

C57.21 refers to a malignant neoplasm located in the right round ligament, which is a fibrous cord that extends from the uterus to the labia majora. This neoplasm is classified under gynecologic malignancies and may present with symptoms such as abdominal pain, pelvic mass, or abnormal bleeding. Diagnosis typically involves imaging studies such as ultrasound or MRI, and histopathological examination following biopsy. The staging of this malignancy is crucial for determining the appropriate treatment approach, which may include surgical resection, chemotherapy, or radiation therapy. CA-125, a tumor marker often elevated in ovarian cancer, may also be monitored, although its relevance in round ligament neoplasms is less established. The management of this condition requires a multidisciplinary approach, involving gynecologic oncologists, radiologists, and pathologists to ensure accurate diagnosis and effective treatment planning.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Specificity of the site (right round ligament) requires precise documentation.
  • Differentiation from benign conditions can be challenging.
  • Staging and treatment options vary significantly based on histological type.
  • Potential for co-existing gynecologic malignancies complicates coding.

Audit Risk Factors

  • Inadequate documentation of malignancy versus benign conditions.
  • Failure to document staging or treatment plans.
  • Misclassification of the neoplasm site.
  • Lack of supporting pathology reports.

Specialty Focus

Medical Specialties

Gynecologic Oncology

Documentation Requirements

Detailed pathology reports, imaging studies, and treatment plans.

Common Clinical Scenarios

Diagnosis of malignant neoplasms, staging evaluations, and treatment planning.

Billing Considerations

Ensure clear documentation of tumor type, size, and staging to support coding.

Radiology

Documentation Requirements

Imaging reports that detail findings related to the neoplasm.

Common Clinical Scenarios

Imaging for suspected malignancies and follow-up imaging post-treatment.

Billing Considerations

Radiology reports should clearly indicate the location and characteristics of the neoplasm.

Coding Guidelines

Inclusion Criteria

Use C57.21 When
  • According to ICD
  • 10 coding guidelines, C57
  • 21 should be used when there is clear documentation of a malignant neoplasm specifically located in the right round ligament
  • Coders must ensure that the diagnosis is confirmed by pathology and that staging is documented appropriately

Exclusion Criteria

Do NOT use C57.21 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

58150CPT Code

Total abdominal hysterectomy

Clinical Scenario

Used when performing a hysterectomy due to malignancy in the round ligament.

Documentation Requirements

Operative reports must detail the procedure and findings.

Specialty Considerations

Gynecologic oncologists should ensure accurate coding of the procedure.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of gynecologic malignancies, including C57.21, which enhances the ability to track and manage these conditions more effectively. The specificity of ICD-10 codes aids in better understanding the epidemiology and treatment outcomes of rare malignancies.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of gynecologic malignancies, including C57.21, which enhances the ability to track and manage these conditions more effectively. The specificity of ICD-10 codes aids in better understanding the epidemiology and treatment outcomes of rare malignancies.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of gynecologic malignancies, including C57.21, which enhances the ability to track and manage these conditions more effectively. The specificity of ICD-10 codes aids in better understanding the epidemiology and treatment outcomes of rare malignancies.

Resources

Clinical References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Coding & Billing References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Frequently Asked Questions

What is the significance of CA-125 in relation to C57.21?

CA-125 is a tumor marker often associated with ovarian cancer. While it may be elevated in cases of malignancy in the round ligament, its utility specifically for C57.21 is less established. It is important to interpret CA-125 levels in conjunction with imaging and histopathological findings.