Question: I know that some changes were made to codes 64420 and 64421 for 2020 and that you cannot report 64420 as a bilateral procedure. [...] You’ve reached your limit of free articles. Already a subscriber? Log in. Not a subscriber? Subscribe today to continue reading this article. Plus, you’ll get: Simple explanations of current healthcare regulations and payer programs Real-world reporting scenarios solved by our expert coders Industry news, such as MAC and RAC activities, the OIG Work Plan, and CERT reports Instant access to every article ever published in Revenue Cycle Insider 6 annual AAPC-approved CEUs The latest updates for CPT®, ICD-10-CM, HCPCS Level II, NCCI edits, modifiers, compliance, technology, practice management, and more Want to know more about Revenue Cycle Insider? Fill out this form to get more information. By completing this form, you are requesting to be contacted by AAPC. For more information, please refer to our Privacy Policy.