Many questions are in SNOMEDCT eg observable entities
Many answers are in LOINC, in particular the answers to questions for assessment scales.
ISO TS 13972 gives careful guidelines to choose the precise code from any code system for both questions and answers.
The blunt this does A and that does B will prove impossible for many concepts and I see no move to 100% redo SnomedCT nor LOINC (because it is unnecessary).
Vriendelijke groet,
Dr. William Goossen
Directeur Results 4 Care BV
+31654614458