What federal program primarily assesses and grants Medicare and Medicaid certifications?

The Centers for Medicare and Medicaid Services (CMS) is the federal program specifically responsible for assessing and granting certifications for Medicare and Medicaid services. This organization administers the nation's major healthcare programs and sets the standards for quality and safety within institutions that provide services under Medicare and Medicaid. CMS conducts surveys, evaluates compliance with regulations, and ensures that healthcare facilities and providers meet the necessary requirements to receive funding through these programs.

In contrast, the Health Resources and Services Administration (HRSA) focuses on improving access to healthcare services for those who are uninsured, isolated, or medically vulnerable, while the National Institute of Health (NIH) primarily focuses on medical research. The Substance Abuse and Mental Health Services Administration (SAMHSA) deals with substance abuse and mental health issues rather than the broader scope of healthcare service certifications. Hence, CMS is the clear choice for oversight and certification in the Medicare and Medicaid spheres.