Clinical Indications for Hyperbaric Oxygen Therapy

For Central Retinal Artery Occlusion, hyperbaric consultation should be considered as early as possible when a patient develops sudden painless monocular vision loss and CRAO is confirmed or strongly suspected.

HBOT should be coordinated alongside, not instead of, urgent ophthalmologic and stroke evaluation.

For selected problem wounds, consultation may be appropriate when:

• A diabetic lower-extremity wound is Wagner Grade 3 or higher
• Standard wound care has been appropriately optimized
• The wound has failed to demonstrate meaningful healing
• Significant tissue hypoxia persists
• Vascular evaluation and revascularization have been addressed when appropriate
• The patient remains at significant risk for tissue loss or amputation

Not all chronic wounds are candidates for HBOT.

HBOT as Part of Multidisciplinary Care

Hyperbaric oxygen therapy should be integrated into comprehensive treatment rather than used as a stand-alone intervention.

For patients with CRAO, management may involve ophthalmology, neurology, emergency medicine, vascular evaluation, and hyperbaric medicine.

For complex wounds, treatment may include:

• Vascular assessment and revascularization when possible
• Surgical or wound debridement
• Infection management
• Pressure off-loading
• Glycemic management
• Nutritional optimization
• Appropriate wound dressings
• Podiatric and surgical care

HBOT does not correct an obstructed artery and should not delay necessary vascular or surgical intervention.

Clinical Evidence and Guidelines

The Undersea & Hyperbaric Medical Society recognizes arterial insufficiencies as an HBOT indication under two categories: Central Retinal Artery Occlusion and enhancement of healing in selected problem wounds.

For CRAO, the rationale for HBOT is based on the ability of the choroidal circulation to deliver increased oxygen to ischemic retinal tissue under hyperbaric conditions. Treatment is most relevant while retinal tissue remains potentially viable.

For diabetic wounds, HBOT is generally reserved for selected advanced ulcers after comprehensive standard treatment has failed. The evidence supports careful patient selection rather than routine treatment of all chronic wounds.

HBOT should therefore be considered an adjunct to appropriate vascular, ophthalmologic, wound, surgical, and medical management.

Medicare Coverage

Medicare coverage varies according to the specific condition.

CMS covers acute peripheral arterial insufficiency as an HBOT indication.

CMS also covers selected diabetic lower-extremity wounds when the patient:

• Has Type 1 or Type 2 diabetes
• Has a lower-extremity wound caused by diabetes
• Has a Wagner Grade 3 or higher wound
• Has failed an adequate course of standard wound therapy

For qualifying diabetic wounds, HBOT is covered as adjunctive therapy after there have been no measurable signs of healing for at least 30 days of appropriate standard treatment.

Importantly, Medicare specifically identifies chronic peripheral vascular insufficiency as a noncovered condition when it does not otherwise qualify under a covered HBOT indication.

When to Refer

Consider hyperbaric medicine consultation for:

• Confirmed or strongly suspected Central Retinal Artery Occlusion
• Sudden painless monocular vision loss consistent with retinal arterial ischemia
• Wagner Grade 3 or higher diabetic lower-extremity wounds that have failed appropriate standard care
• Persistent wound hypoxia after vascular assessment and optimization
• Complex wounds with significant risk of tissue loss or amputation

HBOT should not replace vascular evaluation, revascularization, ophthalmologic or stroke evaluation, debridement, infection management, off-loading, or other appropriate standard treatment.