Hi hmende.z,

You can do this my using the web or R version of BioMart with the Attributes available under the Gene>Phenotype Attributes in the 'Features' section.

You can also use the Ensembl REST API phenotype endpoints. Documentation for the GET phenotype/gene/:species/:gene endpoint can be found below: http://rest.ensembl.org/documentation/info/phenotype_gene

You can also do this using the Ensembl Perl API, and there is a tutorial available here: https://www.ensembl.org/info/docs/api/variation/variation_tutorial.html#phenotype