Thank you for your question. Diagnoses in the Diagnosis_ClinicianConsensus instrument are in no specific order and participants can be given more than one diagnosis. 

The data dictionary can be found on LORIS (https://data.healthybrainnetwork.org/mai...) and at https://fcon_1000.projects.nitrc.org/indi/cmi_healthy_brain_network/Phenotypic.html#Data%20Overview

You can find more information about the diagnostic process at https://fcon_1000.projects.nitrc.org/indi/cmi_healthy_brain_network/Phenotypic.html#Diagnosis