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¹ Some organizations, which are providing health care services, may consist of units or departments that provide different types of health care services or have several separate physical locations, where health care service is provided. These units, departments or physical locations are not themselves legal entities. However, each of them is part of the organization, which is a legal entity. The organization may decide whether its subparts, if it has any, should have their own NPI numbers. In case a subpart conducts any HIPAA standard transactions by itself, without its parent's involvement, it must have its own NPI number.