ICD-10 Logo
ICDxICD-10 Medical Coding
ICD-10 Logo
ICDxICD-10 Medical Coding
ICD 10 CodesDiagnoses
ICD 10 CodesDiagnoses
ICD-10 Logo
ICDxICD-10 Medical Coding

Comprehensive ICD-10-CM code reference with AI-powered search capabilities.

© 2025 ICD Code Compass. All rights reserved.

Browse

  • All Chapters
  • All Categories
  • Diagnoses

Tools

  • AI Code Search
ICD-10-CM codes are maintained by the CDC and CMS. This tool is for reference purposes only.
v1.0.0
ICD-10 Guide
DiagnosesAdnexal Cyst

Adnexal Cyst

ICD-10 Coding for Adnexal Cyst(N83.291, N83.292, N83.299)

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

Diagnosis Overview

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

Key Clinical Considerations:

  • Presence of unilateral or bilateral adnexal masses, often asymptomatic but may present with pelvic pain or discomfort.
  • Ultrasound findings showing cystic structures in the adnexa, typically with thin walls and anechoic content.
  • Physical examination may reveal tenderness or palpable masses in the adnexal region.
  • Transvaginal ultrasound or pelvic MRI may be used to assess the size, shape, and characteristics of the cyst.
  • Severity is often assessed based on size (>5 cm may require further evaluation) and associated symptoms (e.g., pain, pressure).

Clinical Information

Clinical Criteria & Documentation Requirements

  • Document the size, location, and characteristics of the cyst, including whether it is simple or complex.
  • Use specific terminology such as 'adnexal cyst' or 'ovarian cyst' and avoid vague terms.
  • Examples include: 'Patient presents with a 4 cm simple cyst on the right ovary, asymptomatic.'
  • Medical necessity must be established for imaging studies or surgical interventions.
  • Quality measures may include documentation of follow-up care and symptom monitoring.

Coding Guidelines

Usage Guidelines & Examples

  • Use N83.291 for a right adnexal cyst, N83.292 for a left adnexal cyst, and N83.299 for unspecified adnexal cyst.
  • Do not use these codes for conditions such as ectopic pregnancy or ovarian tumors, as they have distinct coding.
  • Compare with N83.20 (unspecified ovarian cyst) for cases where the specific side is not documented.
  • Common errors include misclassifying the cyst type or failing to specify laterality.
  • In complex cases, ensure to document all relevant findings to support the selected code.

Code Exclusions

Important Exclusions

  • Excludes conditions such as ovarian cancer, ectopic pregnancy, and pelvic inflammatory disease.
  • Alternative codes for excluded conditions include C56 (malignant neoplasm of the ovary) and O00 (ectopic pregnancy).
  • Conditions are excluded due to differing pathophysiology and treatment approaches.
  • Common mistakes include coding an adnexal cyst when the patient has a malignant ovarian tumor.
  • Related but distinct conditions include functional cysts and dermoid cysts, which have different management.

Related ICD-10 Codes

Primary Codes
N83.291
Right adnexal cyst
N83.292
Left adnexal cyst
N83.299
Unspecified adnexal cyst
Ancillary Codes
R10.2
Differential Codes
C56.1
C56.2
C56.9

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Gynecology

Specialty Applications

  • Applies to patients with diagnosed adnexal cysts, typically in reproductive-age women.
  • Patient populations include women aged 15-50, particularly those with risk factors for ovarian cysts.
  • Clinical settings include outpatient gynecology clinics, emergency departments, and inpatient settings for surgical intervention.
  • Specialty-specific applications are primarily in gynecology and reproductive endocrinology.
  • Treatment contexts may involve monitoring, surgical intervention, or management of associated symptoms.

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 cyst based on ultrasound findings showing a 4 cm cyst on the right ovary.'

Template 2

Template: 'Clinical presentation consistent with adnexal cyst including pelvic pain and ultrasound confirmation.'

Template 3

Template: 'Diagnostic criteria met as evidenced by transvaginal ultrasound showing a simple cyst.'

Template 4

Template: 'Treatment plan initiated for adnexal cyst with monitoring and follow-up imaging scheduled.'

Template 5

Template: 'Follow-up care for adnexal cyst including monitoring for changes in size or symptoms.'

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?

Detailed documentation of clinical findings, imaging results, and treatment plans is required.

How does this differ from similar diagnoses?

Adnexal cysts are typically benign, while conditions like ovarian tumors may indicate malignancy.

What are common billing considerations?

Ensure medical necessity is documented for imaging and procedures to optimize claims.

What procedures are typically associated?

Related CPT codes may include ultrasound (76856) and laparoscopic cystectomy (58661).

Are there any quality reporting implications?

Quality measures may include follow-up documentation and symptom management strategies.