The following questions may require the use of an ICD-9-CM code book to complete the sentence.

The heterograft replacement of the mitral valve is coded to procedure code __________

If a shelving unit has eight shelves with 20 inches of storage on each shelf, how many inches of filing can the unit hold?

A) 120 inches B) 140 inches C) 160 inches D) 320 inches

What would the partial pressure of oxygen equal in an air mixture at a depth of 99 feet under water?

A. 159 x 2 or 318 mm Hg B. 159 x 4 or 636 mm Hg C. 159 mm Hg D. 159 x 3 or 477 mm Hg