Hi, I need some clarification on osteotomy coding. I’ve got 2 questions, please see below.

I have a record that reflects Smith-Petersen osteotomies taking place at T10-T11, T11-T12, T12-L1, L1-L2. So I have 5 vertebra, 4 interspaces. The CPT description reflects "Vertebral segment", so I’m thinking that I should have a total of 5 units billed total. (T10, T11, T12, L1, and L2)

22214 has an RVU of 43.10.
22212 has an RVU of 42.94.

FIRST QUESTION:
*22214 has the higher RVU, so should the coding reflect 22214 x 1 then 22216 (add-on) x 4?
*Or is it 22214 x 1, 22212-59 x 1, 22216 x 3?

SECOND QUESTION:
Am I correct in 5 units total or is it only counted based on interspaces, even though the code descriptor shows vertebral segment?

Thanks in advance, and if you have anything (links, etc) to support your response I’d greatly appreciate it!