Billing microfracture (different compartments)

Surgeon is billing 29879 done in different compartments of the same knee. Is this correct? I am note sure the verbiage states multiple drilling or microfracture.

Thanks!!

Jun 7th, 2011 -

re: BILLING MICROFRACTURE (DIFFERENT COMPARTMENTS)

It is correct to code 29879 for microfracture of different compartments in knee.