condition that requires gastrectomy followed by b12 injections Do You Still Need After Bariatric Surgery? – Bari Enhance Gastric Bypass vs Sleeve Gastrectomy:

In the United States, injectable vitamin B12 and most combination vitamin B complex injections are regulated and generally require a valid prescription from a licensed healthcare professional

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Harvard Medical School (2017)

This documentation must come from the prescribing provider and typically needs to specify the clinical reason for compounding, such as: Allergy to an inactive ingredient in the commercial product Need for a dose not available in commercial presentations Documented intolerance to the commercial delivery device Billing compounded tirzepatide through the pharmacy benefit uses standard pharmacy claim formats (NCPDP) with the compounding pharmacy NDC