The Americans with Disabilities Act of 1990 (ADA) has three main sections, though there are 5 sections in total:
Title I has to do with private employers’ obligations to provide access to individuals with disabilities, including people who are Deaf or hard-of-hearing. More information can be found on this here: https://www.ada.gov/ada_title_I.htm
Title II has to do with State and Local government entities’ obligations to provide access to individuals with disabilities, including people who are Deaf or hard-of-hearing. More information can be found on this here: https://www.ada.gov/ada_title_II.htm
Title III has to do with places of “public accommodations” and their obligations to provide access to individuals with disabilities, including people who are Deaf or hard-of-hearing. More information can be found on this here: https://www.ada.gov/ada_title_III.htm
Here are some general guidelines that are specific to doctors, lawyers, and places of public accommodation:
Rehabilitation Act of 1973, Title V, Section 504
The purpose of this act was to ensure that federal government entities and those entities receiving federal funding would comply with providing equal access to individuals with disabilities, including people who are Deaf or hard-of-hearing. Section 504 is often used to provide services to students with disabilities in educational settings (504 plans), and helps to ensure FAPE (a free and appropriate public education). More information can be found on this here: https://www.ada.gov/regs2016/504_nprm.html