Wiki post-EVLT f/u US study - 93971 or 76970

Greater Portland (Maine)
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Is it appropriate for a hospital to bill for a f/u ultrasound a month after an EVLT procedure? If so, would 76970 be used or 93971? Our rad is saying that it's "included", but there is no global concept for facility coding/charging, so I don't see how that can be true. Any opinions are appreciated.
We bill the post op doppler 48 hours after the EVLT and bill the 93971. If we do a doppler on their 4 week return and there is no problems and no new problems we don't bill the doppler but if they have a new vein with reflux we do bill the doppler 93971.