The Internal ID is a unique code or identifier that your organization creates. It is used in combination with the data in the Activity Type and Activity Date fields to uniquely identify your activity records. Providers should not use their assigned seven-digit provider ID number as an Internal ID, since this number would be the same for all activities you provide.   The Internal ID field is optional, except in the following cases:  When your organization offers multiple activities in the same format on the same date  When entering activities via batch upload or web services  When the activity offers MOC