Effective July 1, 2019, "Modifiers 59, XE, XS, XP, and XU are among the NCCI-associated modifiers. The Multi-Carrier System (MCS) currently requires that modifiers 59, XE, XS, XP, or XU be appended to the column two code of a PTP edit to bypass the edit. With the implementation of CR 11168, Medicare will allow modifiers 59, XE, XS, XP, or XU on column one and column two codes to bypass the edit."

https://www.cms.gov/Outreach-and-Edu…ds/MM11168.pdf
https://www.cms.gov/Regulations-and-…ds/R4266CP.pdf

Waiting for the quarterly PTP edit file effective July 1, 2019 to be release to see if there are any changes to the format. Would anyone have any more information than this?