Christy, you might read thru the first page of the first link and Misinformation #5 at bottom right of second page of the second link provided below.
The first link will show you how to calculate the number you are asking for.
But regarding the ABN: you said
... who signed an ABN and are receiving maintenance care that is non covered by Medicare. At the top left of Page 3 of the second link, underneath Option 3, CMS makes this statement:
An ABN is issued each time a patient receives a Medicare covered service that the provider believes might be considered not medically reasonable and necessary and thus not payable by Medicare.If you were using that phrase correctly in your post -
receiving maintenance care that is non covered by Medicare - then no ABN is required.
Edit: We must distinguish between:
1. A service or procedure that Medicare covers, but might choose to not pay;
2. A service or procedure that Medicare does not cover, so no payment is expected.
Only the first situation requires an ABN.
http://www.acatoday.org/content_css.cfm?CID=2032http://www.cms.gov/Outreach-and-Education/Medicare-Learning-Network-MLN/MLNProducts/downloads/Chiropractors_fact_sheet.pdf