Most pharmacies today use computer billing. When that is in place there is a short window for rebilling into the past.
Typically it is 30 days. It might be shorter or a little bit longer depending on the insurance at the time. But months is typically out of range for billing on site.
After that window, you may be able to recover past billings manually, by submitting an authorized list of your purchases, and sending them to Medicaid yourself. Check with that agency to see how to do it and obtain the proper forms. I cannot vouch for Medicaid, but other insurances do reimburse this way up to a certain time period.
You can ask if WalMart has a customer service number you can call. Maybe they can advise you further.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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