process of collecting a clinic’s revenues through medical billing, and it initiates with the designing of the RCM work model. This can take anywhere from several days to several months to complete, and require several interactions before a resolution is reached. The relationship between a health care provider and insurance company is that of a vendor to a subcontractor. Health care providers are contracted with insurance companies to provide health care services. The interaction begins with the office visit: a physician or their staff will typically create or update the patient's medical record. After the doctor sees the patient, the diagnosis and procedure codes are assigned. These codes assist the insurance company in determining coverage and medical necessity of the services. Once the procedure and diagnosis codes are determined, the medical biller will transmit the claim to the insurance company (payer). This is usually done electronically by formatting the claim as an ANSI 837 file and using Electronic Data Interchange to submit the claim file to the payer directly or via a clearinghouse. Historically, claims were submitted using a paper form; in the case of professional (non-hospital) services Centers for Medicare and Medicaid Services. Some medical claims get sent to payers using paper forms which are either manually entered or entered using automated recognition or OCR software. The insurance company (payer) processes the claims usually by medical claims examiners or medical claims adjusters. For higher dollar amount claims, the insurance company has medical directors review the claims and evaluate their validity for payment using rubrics (procedure) for patient eligibility, provider credentials, and medical necessity. Approved claims are reimbursed for a certain percentage of the billed services. These rates are pre-negotiated between the health care provider and the insurance company. Failed claims are denied or rejected and notice is sent to the provider. Most commonly, denied or rejected claims are returned to providers in the form of Explanation of Benefits (EOB) or Electronic Remittance Advice. Certain utilization management techniques are put in place to determine the patient's benefit coverage for the medical services rendered. In case of the denial of the claim, the provider reconciles the claim with the original one, makes necessary rectifications and resubmits the claim. This exchange of claims and denials may be repeated multiple times until a claim is paid in full, or the provider relents and accepts an incomplete reimbursement. There is a difference between a