HITPC Provider Directory Environmental Scan from 2010 (dated, but a comprehensive assessment framework)
Provider Directory Solutions: Market Assessment and Opportunties Analysis commissioned by ONC in 2012
Rhode Island Unified Provider Directory Assessment and Recommendations commissioned by ONC in 2013
NwHIN Power Team Provider Directory Recommendations from 2014
Practical Guide to Populating and Maintaining Provider Directories for Health Information Exchange from the PD CoP
Strategic Implementation Guide Provider Directories published in 2016 through the ONC-SIM Health IT Resource Center
IHE ITI Technical Framework Supplement, Healthcare Provider Directory (HPD) for Trial Implementation, version 1.6
Statewide Send and Receive Patient Records Technical Specification version 1.1 (which includes HPD+ v1.1)
PHIN Directory Exchange Implementation Guide version 1.0
Health Care Provider Taxonomy version 8.0, sometimes preferred as the US terminology for provider specialty
Provider Directory Affinity Group Discussion on Standards and Architecture from 2015