You should market this to insurance companies, not individual doctors. At their scale, they can use the data to drive their costs down, and can build a business case for paying you something.
Insurance companies have very little/not at all influence over prescribing patterns of physicians. If you could tie this improved outcomes, then there is a business model here.
Walk into any physician office and ask them how many faxes they get everyday from pharmacists requests the Dr. change their prescription. Then ask the pharmacists what triggers them faxing requests to the Dr.'s requesting change in therapies...hint: insurance companies dictate to the pharmacists their recommendations for Docs.
Edit: I should have noted the "tips". When a pharmacist faxes a Doc a recommendation the pharmacy gets a "tip" and if the Doc actually makes the change, then the pharmacy gets a 2nd "tip." In my experience the Doctors have no idea pharmacists are paid by insurance for recommendations and changes.