Previously Denied Billing Codes for NPs, PAs and CNM Previously Denied Billing Codes for Nurse Practitioner, Physicians Assistant and Certified Nurse Midwives Documents Nurse Practitioner and Physician Assistant Billing Codes - as of September, 2021 NP-PA-Codes-2021_06.xls NP PA Codes 2021 02 NP PA Codes 2020 09 NP PA Codes 2020 06 NP PA Codes 2020 02 NP PA Codes 2020 01 NP PA Codes 2019 10 NP PA Codes 2019 09 NP PA Codes 2019 06 NP PA Codes 2019 04 NP PA Codes 2018 07 NP PA Codes 2018 06 CNM Billing Codes 2017 02 22