ENT performed an excision of a defective laryngeal implant and also did a microlaryngoscopy to inject the vocal cord, but was unable to complete due to supraglottic edema. I was coding this with 31571-52, but I cannot find a CPT code for the removal of the implant. How would you code this procedure? So far I am using the unlisted procedure code 31599, but I am not sure if there is another code I should be using.

Any help would be apprecitated! Thanks.