You are not counting time, you are adding up square centimeters.
I'll take just the first two codes to explain the principle.
15420 Xenograft ... face, scalp, neck, hands, feet ... FIRST 100 sq cm
15421 Xenograft ... EACH additional 100 sq cm ... or part thereof)
The op note tell us that there were 500 sq cm of graft to the face, scalp and neck. Later on in the note we learn that there were 300 sq cm of graft to the hands and feet. All these are part of the same code set - 15420 / 15421. So you add 500 sq cm plus 300 sq cm and get a total of 800 sq cm in the face, scalp, neck, hands and feet.
The first 100 sq cm is coded using 15420. (That's easy enough).
The next 700 sq cm is coded using 15421 for EACH additional 100 sq cm. Since you have 700 sq cm you code 15421 x 7.
You take the same approach with the 15400, 15401 set, though here you are looking at the trunk, arms and legs (except not the hands and feet). Here your total from the op note is 1675 sq cm (950 sq cm on trunk plus 725 sq cm on the legs and arms). The first 100 sq cm is coded using 15400. The remaining 1575 is coded using 15401 x 16 (16 because it is 100 sq or part thereof)
Hope that helps.
F Tessa Bartels, CPC, CEMC
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