Frequencies for companyname variable in pdp2013 dataset : Company Name | Freq. Percent Cum. ----------------------------------------+----------------------------------- ARKANSAS BLUE CROSS AND BLUE SHIELD | 2 0.15 0.15 Aetna Medicare | 101 7.61 7.76 Alliance Medicare Rx | 2 0.15 7.91 AmeriHealth Rx | 4 0.30 8.21 Anthem Blue Cross Life and Health Ins.. | 3 0.23 8.43 Anthem Blue Cross and Blue Shield | 32 2.41 10.84 Asuris Northwest Health | 4 0.30 11.14 Avalon Insurance Company | 4 0.30 11.45 Blue Cross & Blue Shield of Rhode Isl.. | 2 0.15 11.60 Blue Cross Blue Shield of Georgia | 3 0.23 11.82 Blue Cross Blue Shield of Michigan | 2 0.15 11.97 Blue Cross Blue Shield of North Dakota | 2 0.15 12.12 Blue Cross Blue Shield of South Carol.. | 2 0.15 12.27 Blue Cross Blue Shield of Wyoming | 2 0.15 12.42 Blue Cross and Blue Shield of Alabama | 2 0.15 12.58 Blue Cross and Blue Shield of Arizona | 1 0.08 12.65 Blue Cross and Blue Shield of Louisiana | 2 0.15 12.80 Blue Cross and Blue Shield of Massach.. | 2 0.15 12.95 Blue Cross and Blue Shield of Minnesota | 2 0.15 13.10 Blue Cross and Blue Shield of Montana | 2 0.15 13.25 Blue Cross and Blue Shield of Nebraska | 2 0.15 13.40 Blue Cross and Blue Shield of North C.. | 2 0.15 13.55 Blue Cross and Blue Shield of Vermont | 2 0.15 13.70 Blue MedicareRx | 3 0.23 13.93 Blue Shield of California | 2 0.15 14.08 BlueCross BlueShield of Tennessee | 2 0.15 14.23 Cigna Medicare Rx | 79 5.95 20.18 EMI Health | 4 0.30 20.48 EmblemHealth Medicare PDP | 1 0.08 20.56 EnvisionRx Plus | 102 7.68 28.24 Excellus Health Plan, Inc | 1 0.08 28.31 Express Scripts Medicare | 84 6.33 34.64 First Health Part D | 151 11.37 46.01 First Medical Health Plan, Inc. | 2 0.15 46.16 First United American Life Insurance .. | 2 0.15 46.31 Florida Blue | 2 0.15 46.46 HISC - Blue Cross Blue Shield of Illi.. | 2 0.15 46.61 HISC - Blue Cross Blue Shield of New .. | 2 0.15 46.76 HISC - Blue Cross Blue Shield of Okla.. | 2 0.15 46.91 HISC - Blue Cross Blue Shield of Texas | 2 0.15 47.06 Health Alliance Medicare Prescription.. | 1 0.08 47.14 Health First Medicare Prescription Dr.. | 2 0.15 47.29 HealthMarkets Medicare | 50 3.77 51.05 HealthNow New York Inc. | 1 0.08 51.13 HealthSpring Prescription Drug Plan | 51 3.84 54.97 Highmark Health Insurance Company | 4 0.30 55.27 Horizon Blue Cross Blue Shield of New.. | 2 0.15 55.42 Humana Insurance Company | 142 10.69 66.11 Humana Insurance Company of New York | 3 0.23 66.34 Humana Insurance of Puerto Rico, Inc. | 2 0.15 66.49 Medi-CareFirst BlueCross BlueShield | 6 0.45 66.94 PICA | 2 0.15 67.09 Preferred Medicare Choice, Inc. | 3 0.23 67.32 Regence BlueCross BlueShield of Utah | 2 0.15 67.47 Regence BlueShield of Idaho | 2 0.15 67.62 SecureAdvantage Rx | 6 0.45 68.07 Triple-S Salud, Inc. | 2 0.15 68.22 UniCare | 46 3.46 71.69 United American Insurance Company | 98 7.38 79.07 UnitedHealthcare | 151 11.37 90.44 WPS Health Insurance | 2 0.15 90.59 WellCare | 100 7.53 98.12 Wellmark Blue Cross Blue Shield of So.. | 2 0.15 98.27 Wellmark Blue Cross and Blue Shield o.. | 2 0.15 98.42 Windsor Rx | 21 1.58 100.00 ----------------------------------------+----------------------------------- Total | 1,328 100.00 by Jean Roth , jroth@nber.org , 14 Apr 2016