How could a group of physicians increase the monthly payments the group receives from a healthcare plan that uses capitation?

In order for the group of physicians to initiate increase on their monthly payment, they should renegotiate the contract with the healthcare provider.
An assessment and review of service fee is a strategic way to convince the provider for the need of increase, for this group of physicians are paid by a fixed amount per enrollee and not per service on a monthly basis. Moreover, physician that are paid through capitation have incentives to contain cost and financial risk because health plan gives fixed budget to allocate for the care of 200 enrollees.