A negotiated rate is the contracted amount for a service between a plan and an in-network provider. It's usually far below the provider's list price, or chargemaster rate, and varies widely by provider, plan and region.
MRFs label each rate with a negotiated type: negotiated (a dollar amount), derived, fee schedule, percentage (of billed charges), or per diem (a daily rate, common for inpatient stays).
Your out-of-pocket cost is based on the negotiated rate and your plan's deductible, copay and coinsurance.