Master of Health Administration 
Multiple Headset Adapter 
Minimum Holding Altitude 
Master of Healthcare Administration 
Master of Hospital Administration 
Maximum hypothetical accident 
Mental Health Act 
Mental Health Association 
Microangiopathic hemolytic anemia 
Military Housing Area 
Modular Headend Architecture 
Mott-Hubbard-Anderson 
Maintenance Hazard Analysis 
Man Hour Accounting 
Manhattan Pharmaceuticals, Inc. 
Manila Hemp Association 
Marine Historical Association 
Masters in Healthcare Administration 
Master's of Health Administration 
Masters of Healthcare Administration 
may hegglin anomaly 
May-Hegglin anomaly 
measured haplotype analysis 
Medal for Humane Action 
medial hypothalamic area 
membrane hypothesis of aging 
Mental Health Act 1983 
Methaemalbumin 
methionine hydroxy analog 
methylhippuric acid