Basic Med can be used for safety piloting, but only if the Basic Med safety pilot is PIC too.
Basic Med was the add-on, and a lot of the other regs still refer to medical requirements.
Maybe, someday real soon now, the other regs will be re-written to simplify things. Or, maybe, Basic Med might be re-written so it isn't limited to PIC roles.
https://www.faa.gov/documentLibrary/media/Advisory_Circular/AC_68-1A.pdf
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5.2.2 Status of Required Flightcrew Members
5.2.2.1
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A pilot acting as a safety pilot per part 91, § 91.109(c), however, would be a required pilot flightcrew member by regulation rather than a passenger. Section 91.109(c) provides that no person may operate a civil aircraft in simulated instrument flight unless the other control seat is occupied by a safety pilot who possesses at least a private pilot certificate with category and class ratings appropriate to the aircraft being flown. Because a safety pilot is a required pilot flightcrew member, the safety pilot is required to hold a valid and appropriate medical certificate in accordance with § 61.3(a).
BasicMed privileges can only be exercised by a person acting as safety pilot when that person is also acting as PIC. BasicMed privileges do not extend to anyone other than the person acting as PIC.
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