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Does this following technique support the assignment of 34812 for placement of Impella (33990) via cutdown? "Cath was inserted in the LFA. The performance level equalled P9. Cardiac output equalled 3.6 L/min. Comments: Left common femoral artery was punctured under ultrasound guidance. A 6 French sheath was placed, and the arteriotomy was subsequently pre-closed with one perclose device. The arteriotomy was then upsized with serial dilations to the 14 French short impella sheath. The aortic valve was crossed with an Al-1 catheter, and the Impella was advanced through the catheter into the LV with subsequent uncomplicated Impella insertion. At the end of the case the Impella was slowly weaned to P2, and, after 5 minutes of hemodynamic stability consisent with pre-PCI values, the Impella was removed and the arteriotomy closed with the single perclose and an angioseal device without significant bleeding."