Allergy Antigen Preparations
Found this subject in the AAPC Forum Archives....
This is from the CMS manual on one cc being one dose, remember this is for Medicare patients only.
"Code 95165 Doses. - Code 95165 represents preparation of vials of non-venom antigens. As in the case of venoms, some non-venom antigens cannot be mixed together, i.e., they must be prepared in separate vials. An example of this is mold and pollen. Therefore, some patients will be injected at one time from one vial – containing in one mixture all of the appropriate antigens – while other patients will be injected at one time from more than one vial. In establishing the practice expense component for mixing a multidose vial of antigens, we observed that the most common practice was to prepare a 10 cc vial; we also observed that the most common use was to remove aliquots with a volume of 1 cc. Our PE computations were based on those facts. Therefore, a physician's removing 10 1cc aliquot doses captures the entire PE component for the service.
This does not mean that the physician must remove 1 cc aliquot doses from a multidose vial. It means that the practice expenses payable for the preparation of a 10cc vial remain the same irrespective of the size or number of aliquots removed from the vial. Therefore, a physician may not bill this vial preparation code for more than 10 doses per vial; paying more than 10 doses per multidose vial would significantly overpay the practice expense component attributable to this service. (Note that this code does not include the injection of antigen(s); injection of antigen(s) is separately billable.)
When a multidose vial contains less than 10cc, physicians should bill Medicare for the number of 1 cc aliquots that may be removed from the vial. That is, a physician may bill Medicare up to a maximum of 10 doses per multidose vial, but should bill Medicare for fewer than 10 doses per vial when there is less than 10cc in the vial.
If it is medically necessary, physicians may bill Medicare for preparation of more than one multidose vial.
EXAMPLES:
(1) If a 10cc multidose vial is filled to 6cc with antigen, the physician may bill Medicare for 6 doses since six 1cc aliquots may be removed from the vial.
If a 5cc multidose vial is filled completely, the physician may bill Medicare for 5 doses for this vial.
(3) If a physician removes ½ cc aliquots from a 10cc multidose vial for a total of 20 doses from one vial, he/she may only bill Medicare for 10 doses. Billing for more than 10 doses would mean that Medicare is overpaying for the practice expense of making the vial.
(4) If a physician prepares two 10cc multidose vials, he/she may bill Medicare for 20 doses. However, he/she may remove aliquots of any amount from those vials. For example, the physician may remove ½ aliquots from one vial, and 1cc aliquots from the other vial, but may bill no more than a total of 20 doses.
(5) If a physician prepares a 20cc multidose vial, he/she may bill Medicare for 20 doses, since the practice expense is calculated based on the physician's removing 1cc
aliquots from a vial. If a physician removes 2cc aliquots from this vial, thus getting only 10 doses, he/she may nonetheless bill Medicare for 20 doses because the PE for 20 doses reflects the actual practice expense of preparing the vial.
(6) If a physician prepares a 5cc multidose vial, he may bill Medicare for 5 doses, based on the way that the practice expense component is calculated. However, if the physician removes ten ½ cc aliquots from the vial, he/she may still bill only 5 doses because the practice expense of preparing the vial is the same, without regard to the number of additional doses that are removed from the vial."
(AAPC Forum)
