In the cardiology office I work in, we stand by the billing of the 93510 if LV pressures are recorded and the physician makes mention of crossing the aortic valve. If no dye is injected, we leave off the 93555, 93543. For instance, if the doc performs a coronary angio, crosses the ao valve, and records lv pressures only, we would code 93510, 93556, & 93545. A left heart cath, 93510, according to the CPT book, occurs when the catheter crosses into the left ventricle. It doesn't say anything about injecting. The 93555, 93543 are for "injection procedures performed in conjunction with cardiac catheterization" and S&I. Hope this helps.
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