I would think it would be a 91 instead of a 59. In my modifier book "Coding with Modifiers" edition 3 page 245 Modifier 91 it says:
"Modifier 91 may be appended to a laboroatory code to indicate that a laboratory test was performed multiple times on the same day for the same patient and that it was necessary to obtain multiple results in the course of treatment. The note included in the test of the modifier indicates that modifier 91 is not intended to be used when laboratory tests are rerun."
Modifier 59 is used to identify procedures or services not usually reported together but are appropriate under the circumstances, including a different session, different procedure or surgery, different site or organ system, separate incision or excision, separate lesion, or separate injury( or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same individual. Modifier 59 is used only if no more descriptive modifier is available and using modifier 59 best explains the circumstances.
I use the 59 for different methodologies as in cultures. You might have the same CPT code, but different method of testing when they set up the cultures. That would require a 59 modifier.
In the case of glucose testing, I think a modifier 91 would best fit as sometimes they need several tests done during the day and it's the same test method, done on the same type specimen and the same CPT code.
Sorry, didn't mean to go on and on.
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