Billing and Coding: Serum Magnesium

Serum magnesium testing is covered only when clinical medical necessity is documented per the associated Local Coverage Determination; tests without required documentation may be denied. Required documentation includes the ordering physician’s record stating the signs/symptoms or diagnosis, retention of the physician’s order and lab results, availability of records to Medicare on request, and for written redetermination providers must submit all relevant records plus at least two Phase II studies or one Phase III study for Medical Director review.

"ICD-10-CM Codes that Support Medical Necessity — Group 1 (covered diagnoses): D56."

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