Thanks for your question Bill,
The Wagner system was developed and is used commonly for classification of diabetic foot ulcers. The case which you describe, although started as a DFU and was categorized as a Wagner grade 4, was in essence resolved by the BKA surgery. The eschar now associated with the surgery site would be best now described as a failing or compromised flap, and as such, will qualify for HBO via medicare guidelines.
Hope this helps
Craig Lindsey, MD
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