Best bet would be to add a field called "BType" in ArcMap and make it "Short". Then using the select by attributes function select from the field with the medical types.
Once all the features are selected as you would like them grouped, run the field calculator on the newly created "BType" field and give it a calue of "1".
I see you tagged "Excel", if you want to do this in Excel and ArcMap.
Create a field called "B_ID" in ArcMap. Use the field calculator to and add the "OID" field "+1" to the field calculator, to ensure that each feature has a numeric ID.
Export this table to CSV.
Open this CSV in Excel and edit / group the values as are needed, ensuring you do not change the "B_ID" field.
When you are done, save the table as a CSV and add it to ArcMap.
Use a table join and the "B_ID" field to bring the edited values back into your original buildings layer.