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ICD-10 Guide
DiagnosesArachnoid Cyst

Arachnoid Cyst

ICD-10 Coding for Arachnoid Cyst(G93.0, Q04.6)

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

Diagnosis Overview

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

Key Clinical Considerations:

  • Presence of a cystic lesion on imaging studies, typically MRI or CT, located in the subarachnoid space.
  • Symptoms may include headaches, seizures, or neurological deficits, depending on the cyst's size and location.
  • Physical examination may reveal neurological deficits or signs of increased intracranial pressure.
  • Imaging findings should confirm the presence of an arachnoid cyst, often appearing as a well-defined, fluid-filled structure.
  • Severity may be assessed based on the size of the cyst and the presence of associated symptoms or complications.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Complete medical history and physical examination findings must be documented.
  • Specific terminology such as 'arachnoid cyst' should be used consistently in the documentation.
  • Examples include noting the size, location, and any symptoms associated with the cyst.
  • Documentation must demonstrate medical necessity for imaging or surgical interventions.
  • Quality measures may include tracking outcomes related to surgical interventions or symptom resolution.

Coding Guidelines

Usage Guidelines & Examples

  • Use G93.0 for symptomatic arachnoid cysts or those requiring intervention; use Q04.6 for asymptomatic cases.
  • Do not use these codes for other types of cysts or lesions, such as epidermoid cysts or dermoid cysts.
  • Compare with G93.1 (other disorders of brain) and Q04.7 (other congenital malformations of brain).
  • Common errors include misclassifying the cyst type or failing to document symptoms adequately.
  • In complex cases, ensure that the clinical picture aligns with the selected code and document all relevant findings.

Code Exclusions

Important Exclusions

  • Excludes other types of cysts such as epidermoid cysts (D32.0) and dermoid cysts (D32.1).
  • Alternative codes for excluded conditions include G93.1 for other brain disorders.
  • Conditions are excluded due to differing pathophysiology and treatment approaches.
  • Common mistakes include misidentifying the cyst type or failing to document the correct diagnosis.
  • Related but distinct conditions include arachnoiditis and other intracranial lesions.

Related ICD-10 Codes

Primary Codes
G93.0
Arachnoid cyst
Q04.6
Arachnoid cyst, congenital
Ancillary Codes
G91.9
Differential Codes
Q04.6
G93.0

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Neurosurgery

Specialty Applications

  • Applies to patients with diagnosed arachnoid cysts, symptomatic or asymptomatic.
  • Patient populations include all ages, with varying prevalence in children and adults.
  • Clinical settings include neurosurgery, outpatient neurology, and emergency departments.
  • Specialty-specific applications are relevant in neurosurgery and neurology.
  • Treatment contexts may involve monitoring, surgical intervention, or symptom management.

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 arachnoid cyst based on MRI findings showing a cystic lesion in the subarachnoid space.'

Template 2

Template: 'Clinical presentation consistent with arachnoid cyst including recurrent headaches and seizures.'

Template 3

Template: 'Diagnostic criteria met as evidenced by MRI confirming the presence of an arachnoid cyst.'

Template 4

Template: 'Treatment plan initiated for arachnoid cyst with surgical intervention recommended due to symptomatic presentation.'

Template 5

Template: 'Follow-up care for arachnoid cyst including monitoring for symptom recurrence and imaging as needed.'

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 imaging results, clinical symptoms, and treatment plans.

How does this differ from similar diagnoses?

Arachnoid cysts are distinct from other cysts due to their location and potential for symptoms.

What are common billing considerations?

Ensure that documentation supports medical necessity for imaging and any surgical procedures.

What procedures are typically associated?

Commonly associated procedures include MRI, CT scans, and potential surgical interventions.

Are there any quality reporting implications?

Quality measures may include tracking surgical outcomes and symptom resolution post-treatment.