The way the IRP5 is worded is for SARS to determine how much you the taxpayer and your employer each contribute to medical aid.
So the code 3810 means that for whatever portion your employer pays, you will be taxed on that regardless of who pays. That is seen as an income. Code 4005 is the actual amount that will get paid to the medical aid and is taken off your salary. Code 4474 is just a code for employer deductions, but isn't really important from your calculation.
Regardless of how much the contribution is you will only be allowed a deduction for medical aid contributions limited to R720 per month for yourself and your first dependent and then R440 per month for any further dependents.
So based on your amount under code 4008 you are the only dependent which is 720x12 = R8 640.
I hope that makes sense?
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