AR calling, or Accounts Receivable calling, is a communication process between a healthcare provider and an insurance company that has outstanding balances or pending claims. AR callers are professionals who work in the medical billing domain and communicate with insurance companies to follow up on pending claims. The goal of AR calling is to ensure that healthcare providers receive payment for their services by communicating with payers, patients, and hospitals if necessary. AR calling is a critical component of revenue cycle management companies, as it helps to ensure that healthcare providers receive payment for their services. AR calling services can be outsourced to companies like Flatworld Solutions. Effective AR calling requires persistence, knowledge, and quick action.