Here is a coding example that I need help with;

Location: back and shoulder
Back location injected: Bilateral lumbar
Shoulder injected: R periscapular

I’d code this as 20552, however the doctor wants it coded as 20553. I only see the back and the shoulder being injected, but he is going off bilateral when bilateral coding is not considered (modifier 50 not allowed). Would someone PLEASE clear up my confusion with TPI with the example above.

Thank you in advance,