Which of the following laws does NOT amend RA 5527?

The law that does not amend RA 5527 is PD 2019. RA 5527, also known as the Medical Technology Act of the Philippines, has undergone amendments via various presidential decrees and Republic Acts, which aim to modify, update, or expand its provisions.

PD 2019 does not play a role in modifying the original act, while the other choices, such as PD 1534, RA 6138, and PD 498, directly influence or alter the stipulations of RA 5527. This could include aspects like the definitions, scopes of practice, educational requirements, or professional regulation that are germane to the field of medical technology.

By recognizing that PD 2019 stands apart from these amendments, we see how it fits into the broader legislative landscape without directly impacting the Medical Technology Act. Thus, the answer chosen reflects an understanding of the legislative history surrounding RA 5527 and its explicit amendments.