93459 will cover the LHC and IMA assessing for CABG. However, I would assume the carotids (not usually used in bypass grafts) would be coded separately from the heart cath and it's components. The subclavian could be argued either way, it really depends on the intent of the physician. If the subclavian artery's are being used to check for grafts then they would be included in the 93459. But, if the subclavian artery is being used to view the vertebral artery in conjuction with the carotids then you might be able to bill separately. Its hard to give a detailed answer without an op report but hopefully this will somewhat answer your question.
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