If I add a Synonym for the concept (ABC.1), and search in Diagnosis it works fine, but is there any chance that I can do this through code from mapping(P84)?
There is a bug in Bahmni which you can correct and afterwards this feature will be possible:
Change the property “Concept Sources For Diagnosis Search” in OpenMRS Admin Console => Settings => emrapi from ICD-10-WHO to ICD 10 - WHO then click Save
Now you can search Diagnosis by their Code
This is all!