Medicare reimburesment

How can I get reimburesed for a service that was performed by another physician same day. Medicare pays for the first claim that gets there and denies any other claims for same services rendered on same day. Is there a modifier that I can use to reprocess the claim?
Thank you in advance for your advice

more details please

What specialty are you/the other doc? What diagnoses? Office or hospital?

Modifier

Modifier 77 - Repeat Procedure by Another Physician: The physician may need to indicate that a basic procedure or service performed by another physician had to be repeated. This situation may be reported by adding modifier 77 to the repeated procedure or service. This will go to medical necessity