1. Medicare Program: Hospital Outpatient Prospective Payment System and CY 2011 Payment Rates; Final Rule;Department of Health and Human Services, Centers for Medicare & Medicaid Services. 42 CFR Parts 410, 411, 412, 413, 416, 419, and 48;Federal Register,2010
2. Measuring rural hospital quality;Moscovice;J Rural Health.,2004
3. AHRQ. Clinical Classifications Software (CCS) for ICD-9-CM Fact Sheet http://www.hcup-us.ahrq.gov/toolssoftware/ccs/ccsfactsheet.jsp 2010
4. Centers for Medicare & Medicaid Services (CMS) Specifications Manual for Hospital Outpatient Department Quality Measures v 2.1b http://www.qualitynet.org 2011