Aetna publishes its rules in Clinical Policy Bulletin (CPB) 0157, "Obesity Surgery." The clinical thresholds are standard across the large insurers — where people actually get tripped up is the pre-surgical documentation, or choosing a procedure Aetna treats as investigational.
Aetna generally covers these as medically necessary when criteria are met:
Aetna generally does not cover the intragastric balloon (gastric balloon) and similar newer or endoscopic weight-loss procedures, treating them as experimental or investigational.
Aetna uses the long-standing thresholds:
This is a higher bar than Cigna, which has moved to BMI 35 alone (or 30 with a condition). If your BMI is in the 35–39 range without a qualifying condition, you may meet Cigna's threshold but not Aetna's. See how Cigna compares →
Meeting the BMI bar is necessary but not sufficient — Aetna wants a full pre-surgical workup on file. Expect to need:
| Insurer | BMI alone | BMI with a condition | Notable requirement |
|---|---|---|---|
| Aetna | ≥40 | ≥35 | Evaluations + a supervised program (CPB 0157) |
| Cigna | ≥35 | ≥30 | Lower BMI bar; no fixed multi-month diet |
| UnitedHealthcare | ≥40 | ≥35 | Often a designated facility + program |
| Anthem / Elevance | ≥40 | ≥35 | Documented conservative therapy + evaluations |
| Medicare | — | ≥35 + a condition + failed medical treatment | No BMI-alone path |
Enter your BMI, conditions, and plan, and see exactly where you stand against Aetna's real criteria — plus what to document to support approval.
Check my bariatric coverageYes. Sleeve gastrectomy is covered by Aetna as medically necessary when you meet the criteria — generally a BMI of 40 or higher, or 35 or higher with a weight-related condition — plus the required nutritional and psychological evaluations and supervised program.
Yes. Roux-en-Y gastric bypass is a covered procedure under Aetna CPB 0157, subject to the same BMI thresholds and pre-surgical requirements as the gastric sleeve.
Aetna uses a BMI of 40 or higher on its own, or 35 or higher with a weight-related condition such as type 2 diabetes, high blood pressure, high cholesterol, or sleep apnea. That is a higher bar than Cigna, which covers surgery at a BMI of 35 alone or 30 with a condition.
Aetna's policy calls for pre-surgical nutritional and psychological evaluations and, typically, a documented physician-supervised weight-management program before surgery. The exact duration is set by the policy and your specific plan, so confirm your plan's requirement.
Generally no. Aetna typically treats the intragastric balloon (gastric balloon) as experimental or investigational, so it is usually not covered. A covered procedure such as the sleeve or bypass is the more likely path.
The most common reasons aren't the BMI. They are missing pre-surgical evaluations, an incomplete supervised program, a chosen procedure Aetna considers investigational, or an employer plan that excludes bariatric surgery entirely. Completing the workup and confirming the benefit up front prevents most denials.
Related: Weight-loss coverage — the full guide · Cigna · UnitedHealthcare · Anthem · Medicare · coverage checker