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OPTUM 360 (2018).  Current Procedural Coding Expert.

APA Office of Health Care Financing.  (2016, November 16).  Psychotherapy coding clarifications, telemedicine code modifier added to CPT manual.  Retrieved March 20, 2018, from http://www.apapracticecentral.org/update/2016/11-17/telemedicine-code.aspx

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Specific criteria must be met to use prolonged services code.  American Academy of Pediatrics News (January 10, 2018); Retrieved Feb 10, 2019 from http://www.aappublications.org/news/2018/01/10/Coding010518

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