How to document a topical oxygen therapy trial for Medicare

Topical oxygen only gets paid when the chart proves the patient qualifies. Here's the documentation workflow to run before you bill E0446 and A4575.

Step 1: Establish the four-week baseline

At the initial visit, capture wound length, width, depth, and area with calibrated imaging. This is your denominator for the stall calculation. Use AI-powered wound imaging so each measurement carries consistent metadata.

Step 2: Document optimized standard care weekly

For four weeks, chart offloading, debridement, moisture balance, and infection control at every encounter. Payers want to see standard care was truly optimized before advanced therapy.

Step 3: Confirm patient eligibility criteria

Before initiating topical oxygen, the chart must show:

• Diabetes diagnosis with HbA1c below 12% (lab-dated within a reasonable window)
• Adequate perfusion at the foot (ABI, TBI, TcPO2, or pulse exam)
• No osteomyelitis, gangrene, active infection, same-limb DVT, or malignancy

Step 4: Calculate the stall at week four

Compare current wound area to baseline. If reduction is less than 50%, the wound qualifies as stalled. WoundScribe's healing dashboard runs this calculation automatically and flags the trajectory.

Step 5: Order and chart the therapy

Document medical necessity referencing LCD DL33797, order E0446 (system) and A4575 (supply), and fold physician time into 99199. Keep every image, lab, and note timestamped for audit defense with WISER.

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