Wiki Billing E/M codes with an infusion

[marthaarr@qwestoffice.net]

I know this is an old question. But, we are getting push back from some Medicare Advantage plans (Medicare Part C) and Medicaid (payors) on billing for E/M on the same day as an infusion every 91 days. Has the rule changed? I have been researching for a while now and I cant find any specific rule stating we no longer bill and E/M codes for an infusion patient every 91 days. Furthermore aren't Medicaid plans obligated to follow the primary payors rule (traditional Medicare in this instance)?
The secondary is United Health Care Medicaid.
I would appreciate any info on this.

Martha Aragon CRHC