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Typically we use reverse BMI calculators to find out the lowest weight to which a patient can get during their supervised diet and still qualify for insurance coverage.
Many policies only cover weight loss surgery for patients with:
- A BMI over 40
- A BMI of 35 or higher with associated weight-related medical issues (diabetes, sleep apnea, etc)
Here are some links to quality reverse BMI calculators, give them a try: