what does the government payers or insurance carriers perform when an unusual billing pattern has been observed

Whenever there is an unusual billing government payers or insurance carriers perform routine audits.

Examples of unusual billing patterns include but are not to:

the serial reoccurrence of the same diagnostic code after every visit; the repeated billing of the same procedure.

These audits are performed using, in most cases, computer software applications which are capable of screening transactions to uncover such patterns.

Cheers!