this is an excellent question that should be asked on a forum
the following is from the new york insurance commissioner:
Every month, MVP calculates the capitation amounts due to the three IPAs underrisk contracts with MVP (based on a per member per month method), then makes a journal entry to debit claim expenses and credit its accounts payable “due to the IPAs”. MVP invests the amounts due to the IPAs with its own funds in accordance with aninvestment pooling arrangement. Pursuant to the administrative duties specified in the IPA agreements, MVP processes and pays provider claims. MVP issues checks to IPA physicians, who are paid on a fee-for-service basis. MVP then transfers funds to IPA‘s bank accounts on a daily basis to cover the cost of all provider checks that are presented. Following the agreements between the IPAs and their participating physicians, MVP withholds varying percentages (15% or 20%) from the provider payments when issuing checks. The amounts withheld are credited to an IPA withhold liability.
Amounts to be returned to the physicians are reviewed on an annual basis. Any amounts not returned are recorded as reductions of medical expenses, with corresponding reductions made to the related liability in the physicians’ risk withholding account.
In addition, MVP has risk sharing arrangements with the IPAs to address the cost variance for certain medical costs. These risk-sharing arrangements differ between the IPAs. The premise is that MVP and its IPAs are responsible for certain medical costs that affect each other. Under the agreements, the actual medical costs of certain services are compared to budget amounts with the differences being shared by MVP and the IPA.
www.ins.state.ny.us/exam_rpt/mvpmc901.pdf