Vocal cord injection

Good morning.
I have a provider who will be doing a vocal cord injection (Radiasse) via a stab incision in the neck, but using the DL as well. Would the best code be still be 31570, DL with injection?

Many thanks.

injection

http://www.cigna.com/customer_care/healthcare_professional/coverage_positions/medical/mm_0426__injections_for_vocal_cord_paralysis.pdf