A purposeful, dynamic process that involves systematic policy, structural, and process changes and is aimed at achieving desired goals. 
WHO Ageing & Health Glossary
Reform: A purposeful, dynamic process that involves systematic policy, structural and process changes and is aimed at achieving desired goals. 
PubMed Medical Subject Headings (MeSH)
Innovation and improvement of the health care system by reappraisal, amendment of services, and removal of faults and abuses in providing and distributing health services to patients. It includes a re-alignment of health services and health insurance to maximum demographic elements (the unemployed, indigent, uninsured, elderly, inner cities, rural areas) with reference to coverage, hospitalization, pricing and cost containment, insurers' and employers' costs, pre-existing medical conditions, prescribed drugs, equipment, and services.
Year introduced: 1994
 WHO Centre for Health Development (Kobe, Japan). (2004). A glossary of terms for community health care and services for older persons. Kobe, Japan : WHO Centre for Health Development. https://apps.who.int/iris/handle/10665/68896