Hi Fede,
There are a *lot* of loincs that can come in with something as "simple" as vitals, but we do return at least the loincs defined on that page for the vitals defined. IE: even when we return a Weight with the loinc you list, it should also be returning 29463-7 in the list of codeableConcepts for the Observation.code.
Also, if you're wanting to show all vitals, you can just query by the vital-signs category. EG: Observation?patient=123&category=vital-signs
I recommend that over querying by each loinc.
If you're truly wanting to show *all* observations (not just vital signs) that is a different ask. There are some results that will come back un-coded, and the list of loincs would be ever-growing (within the loinc standard)
Regards,
~ Jenni