Use Parameter In OPENROWSET Sql Server

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SQL-Server

I am creating an stored procedure in which I am calling an another stored procedure(This procedure is returned lot of columns and I want only one column value So I can't create temp table to store values) using OPENROWSET.

When I am use following then it's alright
declare @AgencyID int=15,@PatientID int=3701

SELECT a.PrimaryInsuredName 
    FROM OPENROWSET('SQLNCLI',  
    'Server=ServerName;Database=DbName;Trusted_Connection=yes',
    'exec USP_Billing_GetPatientWithInsurence 3701,15') AS a;

It's working fine. But I want to pass parameters for calling USP_Billing_GetPatientWithInsurence because values will be dynamic. So I use following code

declare @AgencyID int=15,@PatientID int=3701
   SELECT a.PrimaryInsuredName
       FROM OPENROWSET('SQLNCLI',
       'Server=ServerName;Database=DbName;Trusted_Connection=yes',
       'exec USP_Billing_GetPatientWithInsurence '+ @PatientID +','+ @AgencyID+'') AS a;

But it's not working When I run this query then an error occurred Incorrect syntax near '+'. I don't know why this is coming. Please provide a solution to this. I googled also for this but can't found a proper solution.
Thanks