What is the payer's responsibility sequence number for the payer of last resort?

When coding the phrase “right upper extremity cast change due to breakage of cast,” the term to reference in the Index is _____.

A. cast B. change C. breakage D. extremity

Sodium and ____ are the two major electrolytes that must be monitored.

A. magnesium B. potassium C. chloride D. calcium