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Legacy eRx - Technical Details

The information below includes technical information about Legacy eRx. Also see Legacy eRx Troubleshooting or Legacy eRx FAQ.

How are users with multiple locations or providers tracked?
There are three identifiers that Legacy eRx uses to divide information logically: AccountID, SiteID, and LocationID. For each unique AccountID and SiteID pair, a unique database is created at Legacy eRx. Open Dental always sends a SiteID equal to 1, therefore unique Legacy eRx databases will only be created for each unique AccountID.  Legacy eRx Provider IDs (Open Dental ProvNums) must be unique for each Legacy eRx AccountID, and to meet this requirement, Open Dental automatically creates a unique AccountID for each logical database the first time an electronic prescription is sent from that database. The AccountID format is the Open Dental customer account number followed by a dash followed by 5 random alpha-numeric characters. For example, 1234-T2d28.  There is no way for the user to edit the AccountID. Open Dental always sends a LocationID of "0" if Clinics are not being used. Otherwise, the ClinicNum is sent for the LocationID. Within the Legacy eRx interface, the user can view information for a single location or for all locations.

Prior to version 13.2.21, disabling Legacy eRx removed the existing Account ID, and if re-enabled later, a new Account ID would be generated. In later versions, the Account ID is only disabled, not removed.

The Legacy eRx database will be LexiComp if and only if the first Legacy eRx click occurs when the Open Dental version is 15.4 or greater. Otherwise the Legacy eRx database will be FBD.

All providers that share the same NPI number are treated as a single provider for Legacy eRx purposes. 

GUID values: When e-prescriptions are copied into the Chart module (when Chart module is refreshed), corresponding prescriptions and medications in Open Dental are identified by a GUID value supplied by Legacy eRx. The GUID is how Open Dental determines if a record has already been created.


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