J1644 and 96365

Hello all! We are a multi specialty practice and our infusion office is having issues getting J1644 (Heparin) to pay along with 96365 (IV Infusion). We use Encoder Pro for CCI edits and according to Encoder Pro, 96365 is the primary code and we have a choice of these modifiers:

59 Distinct Procedural Service

PD Diagnostic or related nondiagnostic item or service provided in a wholly owned or operated entity to a patient who is admitted as an inpatient within 3 days

Q6 Service furnished by a locum tenens physician

We have tried adding a 59 modifier but the claims are still rejecting. Does anyone have any tips they can offer on how to get these claims paid?

J1644 and 96365