Hallucinations  
Hallucinations are experiences of sensations that have no source. Some examples of hallucinations include hearing nonexistent voices, seeing nonexistent things, and experiencing burning or pain sensations with no physical cause.

Health Employer Data and Information Set (HEDIS)  
A set of HMO performance measures that are maintained by the National Committee for Quality Assurance. HEDIS data is collected annually and provides an informational resource for the public on issues of health plan quality.

Health Insurance Portability and Accountability Act (HIPAA)  
This 1996 act provides protections for consumers in group health insurance plans. HIPAA prevents health plans from excluding health coverage of pre-existing conditions and discriminating on the basis of health status.

Health Maintenance Organization (HMO)  
A type of managed care plan that acts as both insurer and provider of a comprehensive set of health care services to an enrolled population. Services are furnished through a network of providers.

Hispanic or Latino  
A person of Cuban, Mexican, Puerto Rican, South or Central American, or other Spanish culture or origin, regardless of race. The term, "Spanish origin," can be used in addition to "Hispanic or Latino."

Home-based services
Help provided in a family's home either for a defined period of time or for as long as it takes to deal with a mental health problem. Examples include parent training, counseling, and working with family members to identify, find, or provide other necessary help. The goal is to prevent the child from being placed outside of the home. (Alternate term: in-home supports.)

Homeless    
A person who lives on the street or in a shelter for the homeless.

Horizontal consolidation
When local health plans (or local hospitals) merge. This practice was popular in the late 1990s and was used to expand regional business presence.

Housing Services    
Assistance to clients/patients in finding and maintaining appropriate housing arrangements.