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ICD-10 Guide
DiagnosesAion

Aion

ICD-10 Coding for Anterior Ischemic Optic Neuropathy(H47.011, H47.012)

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

Diagnosis Overview

What is Aion?
Essential facts and insights about Anterior Ischemic Optic Neuropathy

Key Clinical Considerations:

  • Sudden, painless vision loss in one eye, often upon waking.
  • Optic disc swelling observed during fundoscopic examination.
  • Visual field defects, typically a central scotoma or altitudinal defect.
  • Visual acuity may vary from normal to severely reduced.
  • No evidence of other causes of optic neuropathy, such as trauma or inflammation.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Document the onset, duration, and characteristics of vision loss.
  • Include specific terminology such as 'anterior ischemic optic neuropathy' or 'AION'.
  • Examples: 'Patient presents with sudden vision loss in the right eye, diagnosed with AION.'
  • Document medical necessity for diagnostic tests like visual field testing and imaging.
  • Quality measures may include documentation of visual acuity and follow-up care.

Coding Guidelines

Usage Guidelines & Examples

  • Use H47.011 for non-arteritic AION and H47.012 for arteritic AION.
  • Do not use these codes for other types of optic neuropathy, such as traumatic or toxic.
  • Compare with H47.019 (unspecified optic neuropathy) for cases lacking clear etiology.
  • Common errors include misclassifying AION as a retinal detachment; ensure correct diagnosis.
  • In complex cases, consider comorbidities and document all relevant findings.

Code Exclusions

Important Exclusions

  • Exclude traumatic optic neuropathy (S05.0) and toxic optic neuropathy (H27.1).
  • Use alternative codes for conditions like glaucoma or retinal detachment.
  • Conditions are excluded due to differing pathophysiology and treatment approaches.
  • Common mistakes include misdiagnosing AION when the cause is retinal or traumatic.
  • Related conditions like papilledema should be documented separately.

Related ICD-10 Codes

Primary Codes
H47.011
Non-arteritic anterior ischemic optic neuropathy
H47.012
Arteritic anterior ischemic optic neuropathy
Ancillary Codes
M31.6
Differential Codes
H46.0

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Ophthalmology

Specialty Applications

  • Patients with sudden vision loss, particularly those over 50 years old.
  • Higher risk in individuals with vascular risk factors (e.g., hypertension, diabetes).
  • Clinical settings include outpatient ophthalmology clinics and emergency departments.
  • Specialty-specific applications in ophthalmology and neurology.
  • Treatment contexts may involve corticosteroids for arteritic cases.

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 anterior ischemic optic neuropathy based on clinical findings of sudden vision loss.'

Template 2

Template: 'Clinical presentation consistent with AION including sudden, painless vision loss and optic disc swelling.'

Template 3

Template: 'Diagnostic criteria for AION met as evidenced by visual field defects and fundoscopic findings.'

Template 4

Template: 'Treatment plan initiated for AION with corticosteroids and follow-up scheduled.'

Template 5

Template: 'Follow-up care for AION including monitoring of visual acuity and risk factor management.'

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?

Document clinical findings, visual acuity, and any imaging results.

How does this differ from similar diagnoses?

AION is characterized by sudden vision loss without pain, unlike other optic neuropathies.

What are common billing considerations?

Ensure medical necessity is documented for all tests and treatments related to AION.

What procedures are typically associated?

CPT codes for visual field testing and optical coherence tomography (OCT) are commonly used.

Are there any quality reporting implications?

Quality measures may include follow-up visual acuity assessments and management of risk factors.