Wiki observation codes for cardiologists

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We are a cardiology practice that is called for services provided in the hospital. I am having quite the issue understanding exactly how to bill observation codes. When our group is consulted to see the patient what code should we be billing if the patient is already admitted to observation status by the primary care provider??

I understand that guidelines state that the admitting provider is the only one allowed to bill observation 99218-99220 as the initial code. Everything in my book refers me back to this code. We have a lot of denials from 2015 stating that only one provider allowed to bill please see other code set.

We use if commercial insurance, the office/outpatient consult 99241-99245. If medicare we use office/outpatient either new 99201-99205 or established 99211-99215.