Optimized Sp

Is it some how The following sp can be optimized?
IF @groupID='812846'
BEGIN
IF (SELECT count(*) from Employee where SSN= @SSN and groupID=@groupID) > 0
BEGIN
UPDATE Employee
SET NameLast=@LastName,
NameFirst=@FirstName,
NameMiddle=@MI,

WHERE SSN= @SSN and GroupId=@GroupId
select @EmpId=EmpId from Employee where SSN= @SSN and groupID=@groupID
END
ElSE
BEGIN
insert into Employee (GroupId, NameLast, NameFirst, NameMiddle,SSN)
values (@GroupId, @LastName, @FirstName, @MI, @SSN)
select @EmpId = @@IDENTITY
END

END

else
BEGIN
insert into Employee (GroupId, NameLast, NameFirst, NameMiddle, SSN)
values
(@GroupId, @LastName, @FirstName, @MI, @SSN)
select @EmpId = @@IDENTITY
END