What is the best practice for duplicate concepts? The 5 examples listed below appear to be the same concept but for the different answer lists. Only one of them, 44255-8, is consistent with the validated tool. https://www.phqscreeners.com/sites/g/files/g10049256/f/201412/PHQ-9_English.pdf
Following are five examples of the same concept from Pfizer’s PHQ2/PHQ9 Depression Screenings:
https://r.details.loinc.org/LOINC/44255-8.html
https://r.details.loinc.org/LOINC/54638-2.html
https://r.details.loinc.org/LOINC/54639-0.html