The Medication Mapping Interchange Data Layer (MMIDL) is a series of infrastructure projects that will provide a "bridging strategy" to enable a phased migration to Medication Knowledge Base (MKB) Modernization across PHS. MMIDL is essentially a database of mappings between Partners knowledge bases to a standard, commercial terminology system, specifically First Data Bank’s NDDF Plus terminology. This will enable Partners to not only leverage standard content and knowledge provided by FDB, but it will also enable medication interoperability among sites within the Partners system.

Within Partners, there are various representations of medication content and knowledge and interoperability is a major roadblock for better and more advanced medication decision support and technologies such as e-prescription. MMIDL is therefore be a critical cornerstone for the deployment of new Partners-wide medication-related decision support services and initiatives. Key Signature Initiative medication services projects including Medication Reconciliation, Common Allergy 2.0, along with other high priority services such as Drug Classification, and the MGH POE/Misys Rx interface will be supported by the resulting data integration. Ultimately this project will be part of a larger bridge that moves all of PHS from a distributed information state to a single enterprise-wide medication knowledge base (MKB).

To successfully implement MMIDL, a series of projects will be undertaken. The long-term vision for the series of MMIDL projects includes multiple medication terminologies (PHS and non-PHS) and a rich set of translation and classification services. MMIDL 1.0 centers around establishing the MMIDL database, initiating the PHS source to NDDF mapping, and the design and development of translation services for a subset of medication terminologies that are required for certain near-term business objectives. The PHS sources for this project are the MDD (PHS Master Drug Dictionary), and the Costar medication terminology. MMIDL will act as the common standard "interlingua" that will act as the center of the hub for translation services between PHS source terminologies.