Additionally, effective on and after January 1, 2023, CPT modifier “93” can be appended to claim lines, as appropriate, for services furnished using audio-only communications technology in accordance with our regulation at § 410.78(a)(3). All providers, including RHCs, FQHCs, and OTPs must append Medicare modifier “FQ” (Medicare telehealth service was furnished using audio-only communication technology) for allowable audio-only services furnished in those settings. However, consistent with our proposal for audio-only services furnished under the PFS, we are also finalizing to require all providers including RHCs, FQHCs, and OTPs to use modifier “93” when billing for eligible mental health services furnished via audio-only telecommunications technology. Providers have the option to use the “FQ” or the 93” modifiers or both where appropriate and true, since they are identical in meaning.