I found this today, its a copy of a webpage.
It may help some.
Copyright © 2008 by American Society of Clinical Oncology.
Concurrent Infusions
ASCO's Coding and Reimbursement Hotline continues to receive questions regarding concurrent infusions. In 2006, the current procedural terminology (CPT) Editorial Panel created a specific code, 90768, for concurrent infusions of nonchemotherapy drugs or substances. The questions and answers in this article are designed to provide additional information and clarification regarding the use of the concurrent drug administration code.
What is a concurrent infusion?
A concurrent infusion is one in which two drugs are simultaneously infused or multiple infusions are provided through the same intravenous line.
If a second drug is added to a bag for intravenous administration, can the administration of the second drug be reported?
No. More than one substance in a single bag is considered one infusate and one infusion. In this scenario, only one administration can be reported. However, the J-code for each substance or drug would be separately reportable.
If two drugs are infused simultaneously but hang in separate bags, is this considered a concurrent infusion?
Yes. If multiple drugs are hung separately but run simultaneously, the administration is considered to be concurrent. In this situation, you would report an initial or subsequent administration (depending on your identified primary service) for the first drug, and a concurrent administration for the second drug.
What if two drugs are mixed in the same bag and administered for only 15 minutes?
An infusion of 15 minutes or fewer is defined as a push, and the appropriate push code (initial or subsequent) should be reported. In this situation, the infusion would be reported as one push; however, each substance or drug would be separately reported.
Can more than one concurrent administration code be reported?
The CPT book provides clear guidance that concurrent infusion can be billed only once per patient encounter.
The Coding and Reimbursement Hotline receives many questions relating to the administration of leucovorin with an antineoplastic agent such as fluorouracil. Leucovorin is used in some chemotherapy regimens to enhance the antineoplastic effect; however, Medicare carriers, fiscal intermediaries, and/or Medicare Administrative Contractors have the discretion to determine whether the administration of leucovorin should be reported as a nonchemotherapy or chemotherapy administration.
http://jop.ascopubs.org/content/4/4/171.full