global period question

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ON 5-12-16 we billed for 33207 for a pacemaker that had a 90 day global period and it was paid by insurance. The dx for this procedure was a chronic atrial fibrillation with I48.2.

On 6-9-16 we billed for 93650 and 93286 X 2 and the 93650 for IC cath ablate AV node was denied by insurance due to the fact that it was supposed to be included in the global period according to the insurance. They did pay for the 93286 X 2. The primary dx for the93650 was I25.5 for ischemic cardiomyopathy, I48.2 for atrial fibrillation, and Z95.0 for presence of cardiac pacemaker.

I don’t have a full understanding of the 93650 procedure. Should the 93650 have been included in the global period for the 33207 or is it missing a modifier for billing?