This polygon shapefile contains primary health care professional shortage areas (HPSAs) in California. The federal HPSA designation identifies areas as having a shortage of health care providers on the basis of availability of primary care physicians. To qualify for designation as a HPSA, an area must be: 1. A rational service area, [the Federal Shortage Designation Branch recognizes Medical Service Study Areas in California as rational service areas.] 2. Population to primary care physician ratio: 3,500:1 or 3,000:1 plus population features demonstrating "unusually high need". 3. A lack of access to health care in surrounding areas because of excessive distance, over-utilization, or access barriers. Benefits of designation as a HPSA include: Student loan repayment and personnel placement through the National Health Service Corps (NHSC); Improved Medicare reimbursement. Physicians in geographic HPSAs are automatically eligible for a 10% increase in Medicare reimbursement; Eligibility for Rural Health Clinics (a prospective payment method designed to enhance access to primary health care in rural underserved areas); Eligibility for the California State Loan Repayment Program; Enhanced federal grant eligibility; and Funding preference for primary care physician, physician assistant, nurse practitioner, and nurse midwife programs that provide substantial training experience in HPSAs. The original legislation was enacted by Congress in the 1970s, Section 332 of the U.S. Public Health Service Act (as amended); Health Care Safety Net Amendments authorized automatic facility HPSA process for Federally Qualified Health Centers (FQHC), and Rural Health Centers (RHC). Authorizes the Secretary of U.S. Department of Health and Human Services to designate shortage areas delegated to Health Resources and Services Administration/Bureau of Health Professions/ National Center for Health Workforce Analysis/Shortage Designation Branch. This is version 6 of this data (updated: 2010). This layer is part of the Healthcare Atlas of California.This data was developed by the Office of Statewide Health Planning and Development's (OSHPD) Healthcare Workforce and Community Development Division (HWCDD). The data is used to support the following programatic areas: 1) encourage demographically underrepresented groups to pursue healthcare careers 2) identifies geographic areas of unmet need, and 3) encourages primary care physicians and non-physician practitioners to provide healthcare in medically underserved areas in California.