There are three types of billing systems in healthcare: closed, open, and isolated. The closed billing system does not allow transfers and focuses on a single practice. An example of a closed billing system is EMR (Electronic Medical Record), as it does not collaborate with other medical practices. EHR (Electronic Health Record) is an open billing system as it will enable transfer across healthcare professionals, such as between doctors and labs. It is a collaborative system, and they are regarded as efficient medical billing services as everyone is privy to the patient's information. An isolated system is completely removed from the facilities, and the patients themselves manage the records. These are not commonly used by hospitals.