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v1.0.0
ICD-10 Guide
DiagnosesAdnexal Mass

Adnexal Mass

ICD-10 Coding for Adnexal Mass(N83.0, C57.4)

PRIMARY SPECIALTYGynecology
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Adnexal Mass?
Essential facts and insights about Adnexal Mass

Key Clinical Considerations:

  • Presence of a palpable adnexal mass during pelvic examination
  • Ultrasound findings indicating the presence of an adnexal mass, such as cysts or solid tumors
  • Laboratory tests showing elevated tumor markers (e.g., CA-125) in cases of suspected malignancy
  • Imaging studies (CT, MRI) revealing size, composition, and vascularity of the mass
  • Staging criteria based on the size and spread of the mass if malignancy is suspected

Clinical Information

Clinical Criteria & Documentation Requirements

  • Complete medical history including menstrual and reproductive history
  • Detailed description of the mass characteristics (size, consistency, tenderness)
  • Use of specific terminology such as 'adnexal mass', 'ovarian cyst', or 'tumor'
  • Examples of compliant coding include clear identification of the mass and associated symptoms
  • Documentation of medical necessity for imaging or surgical intervention

Coding Guidelines

Usage Guidelines & Examples

  • Use N83.0 for benign adnexal masses such as functional ovarian cysts; use C57.4 for malignant neoplasms
  • Do not use N83.0 for masses that are confirmed malignant or have suspicious features
  • Comparison with N83.1 (ovarian cyst) and C57.9 (malignant neoplasm of unspecified site) for clarity
  • Common errors include misclassifying benign masses as malignant; ensure accurate imaging results are documented
  • In complex cases, consider the patient's history and imaging results to select the most appropriate code

Code Exclusions

Important Exclusions

  • Excludes conditions such as ectopic pregnancy (O00) and benign neoplasms of the uterus (D25)
  • Alternative codes for excluded conditions include O00 for ectopic pregnancy and D25 for uterine fibroids
  • Conditions are excluded to ensure accurate representation of the diagnosis and treatment plan
  • Common mistakes include using N83.0 for conditions that are clearly defined as ectopic or malignant
  • Related but distinct conditions include functional ovarian cysts versus neoplastic masses

Related ICD-10 Codes

Primary Codes
N83.0
Unspecified adnexal mass
C57.4
Malignant neoplasm of other and unspecified female genital organs
Ancillary Codes
R10.2
R18.0
Differential Codes
C56.9
N83.0

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Gynecology

Specialty Applications

  • Conditions such as ovarian cysts, tumors, or ectopic pregnancies
  • Patient populations include women of reproductive age, particularly those with irregular menstrual cycles
  • Clinical settings include outpatient gynecology clinics, emergency departments, and inpatient surgical units
  • Specialty-specific applications in gynecology and oncology
  • Treatment contexts may involve monitoring, surgical intervention, or oncological treatment

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Template 1

Template: 'Patient diagnosed with adnexal mass based on pelvic examination and ultrasound findings.'

Template 2

Template: 'Clinical presentation consistent with adnexal mass including abdominal pain and irregular menstruation.'

Template 3

Template: 'Diagnostic criteria met as evidenced by ultrasound showing a 5 cm cystic mass on the right ovary.'

Template 4

Template: 'Treatment plan initiated for adnexal mass with laparoscopic evaluation scheduled.'

Template 5

Template: 'Follow-up care for adnexal mass including monitoring of symptoms and repeat imaging in 6 weeks.'

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

What documentation is required for this diagnosis?

Documentation should include clinical findings, imaging results, and treatment plans.

How does this differ from similar diagnoses?

Differentiation is based on imaging characteristics and clinical presentation.

What are common billing considerations?

Ensure that all services provided are medically necessary and well-documented.

What procedures are typically associated?

Commonly associated procedures include ultrasound, laparoscopy, and tumor marker testing.

Are there any quality reporting implications?

Quality measures may include tracking outcomes of surgical interventions and follow-up care.