Billing and Coding: Serum Magnesium

Coverage and billing of serum magnesium testing require retention of the ordering physician's documentation of medical necessity (signs/symptoms and/or diagnosis), the physician's order, and the lab results in the medical record and availability to Medicare upon request. For appeals (written redetermination), providers must submit all relevant records and supporting literature including at least two Phase II studies or one Phase III study; failure to provide required documentation may result in claim denial.

"Claims may be denied if documentation is not made available to Medicare upon request."

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