Medical Service Study Areas

<div><b><font size='3'>This is the current Medical Service Study Area. California Medical Service Study Areas are created by the California Department of Health Care Access and Information (HCAI).</font></b><br /></div><div><b><font size='3'><br /></font></b></div><div><font size='3'><b>Check the </b></font><a href='https://hcai.maps.arcgis.com/home/item.html?id=e51a052257b646b9bfbc052df8728b50' target='_blank' rel='nofollow ugc noopener noreferrer'>Data Dictionary</a><font size='3'><b> for field descriptions.<br /></b></font><div><font size='3'><br /></font></div><div><div><font size='3'>Search for the </font><a href='https://data.chhs.ca.gov/dataset/?q=Medical+Service+Study+Area' target='_blank' rel='nofollow ugc noopener noreferrer'>Medical Service Study Area</a><font size='3'> data on the </font><a href='https://data.chhs.ca.gov/' target='_blank' rel='nofollow ugc noopener noreferrer'>CHHS Open Data Portal</a><font size='3'>.</font></div><div><font size='3'><br /></font></div><div><font size='3'>Checkout the </font><a href='https://gis.data.ca.gov/' target='_blank' rel='nofollow ugc noopener noreferrer'>California Healthcare Atlas</a><font size='3'> for more </font><a href='https://gis.data.ca.gov/search?q=mssa' target='_blank' rel='nofollow ugc noopener noreferrer'>Medical Service Study Area</a><font size='3'> information.</font></div><div><span><span><p style='margin-bottom:8px;'>This is an update to the MSSA geometries and demographics to reflect the new 2020 Census tract data. The Medical Service Study Area (MSSA) polygon layer represents the best fit mapping of all new 2020 California census tract boundaries to the original 2010 census tract boundaries used in the construction of the original 2010 MSSA file. Each of the state's new 9,129 census tracts was assigned to one of the previously established medical service study areas (excluding tracts with no land area), as identified in this data layer. The MSSA Census tract data is aggregated by HCAI, to create this MSSA data layer. This represents the final re-mapping of 2020 Census tracts to the original 2010 MSSA geometries. The 2010 MSSA were based on U.S. Census 2010 data and public meetings held throughout California.</p></span></span></div></div><div><span style='font-size:medium;'><br /></span></div><div style='text-align:center;'><img alt='https://hcai.ca.gov/' src='https://hcai.ca.gov/wp-content/themes/oshpd/assets/images/logo-color.svg' /><font size='3'><br /></font></div><div><font size='3'><br /></font></div><div><font size='3'><b>Source of update:</b> American Community Survey 5-year 2006-2010 data for poverty. For source tables refer to InfoUSA update procedural documentation. The 2010 MSSA Detail layer was developed to update fields affected by population change. The American Community Survey 5-year 2006-2010 population data pertaining to total, in households, race, ethnicity, age, and poverty was used in the update. The 2010 MSSA Census Tract Detail map layer was developed to support geographic information systems (GIS) applications, representing 2010 census tract geography that is the foundation of 2010 medical service study area (MSSA) boundaries. ***This version is the finalized MSSA reconfiguration boundaries based on the US Census Bureau 2010 Census. In 1976 Garamendi Rural Health Services Act, required the development of a geographic framework for determining which parts of the state were rural and which were urban, and for determining which parts of counties and cities had adequate health care resources and which were &quot;medically underserved&quot;. Thus, sub-city and sub-county geographic units called &quot;medical service study areas [MSSAs]&quot; were developed, using combinations of census-defined geographic units, established following General Rules promulgated by a statutory commission. After each subsequent census the MSSAs were revised. In the scheduled revisions that followed the 1990 census, community meetings of stakeholders (includin