MA payer rollup

Who owns Medicare Advantage?

Every organization holding an active MA contract in the United States, ranked by enrollment and geographic footprint. Sourced from the CMS Monthly Enrollment by State/County/Contract file.

714

MA contract holders

35,291,507

Total MA enrolled

HUMANA INSURANCE COMPANY

Largest payer

7.13% national share

30.3%

Top-5 concentration

100 of 714 payers

#	Organization	Enrolled	States	Counties	Share %
1	HUMANA INSURANCE COMPANY 8 contracts	2,516,320	51	2,650	7.13%
2	AETNA LIFE INSURANCE COMPANY 3 contracts	2,464,033	51	2,416	6.98%
3	SIERRA HEALTH AND LIFE INSURANCE COMPANY, INC. 2 contracts	2,251,512	51	2,868	6.38%
4	CARE IMPROVEMENT PLUS SOUTH CENTRAL INSURANCE CO. 19 contracts	1,897,614	43	2,173	5.38%
5	KAISER FOUNDATION HP, INC. 4 contracts	1,551,173	10	71	4.40%
6	UNITEDHEALTHCARE OF WISCONSIN, INC. 4 contracts	1,313,038	22	1,187	3.72%
7	EMPHESYS INSURANCE COMPANY 1 contracts	1,143,308	48	2,142	3.24%
8	UnitedHealthcare Benefits of Texas, Inc. 5 contracts	1,069,205	8	186	3.03%
9	HUMANA MEDICAL PLAN, INC. 1 contracts	837,839	12	357	2.37%
10	BCBS OF MICHIGAN MUTUAL INSURANCE COMPANY 1 contracts	553,220	46	774	1.57%
11	ARCADIAN HEALTH PLAN, INC. 2 contracts	536,802	15	598	1.52%
12	HEALTHSPRING LIFE & HEALTH INSURANCE COMPANY, INC. 7 contracts	486,413	33	537	1.38%
13	UNITEDHEALTHCARE OF THE MIDLANDS, INC. 2 contracts	455,397	8	529	1.29%
14	ANTHEM INSURANCE COMPANIES, INC. 6 contracts	430,530	50	1,494	1.22%
15	SCAN HEALTH PLAN 3 contracts	423,410	5	41	1.20%
16	PREFERRED CARE PARTNERS, INC. 1 contracts	392,004	1	66	1.11%
17	CARITEN HEALTH PLAN INC. 1 contracts	369,242	8	290	1.05%
18	HEALTHFIRST HEALTH PLAN, INC. 3 contracts	368,223	5	21	1.04%
19	HUMANA WI HEALTH ORGANIZATION INSURANCE CORP 2 contracts	349,383	14	408	0.99%
20	HUMANA BENEFIT PLAN OF ILLINOIS, INC. 3 contracts	337,923	15	519	0.96%
21	CHA HMO, INC. 1 contracts	334,180	12	233	0.95%
22	BCBSM, Inc. 2 contracts	326,826	8	117	0.93%
23	AETNA HEALTH INC. (PA) 3 contracts	285,856	12	285	0.81%
24	PRIORITY HEALTH 2 contracts	275,572	4	83	0.78%
25	EXCELLUS HEALTH PLAN, INC. 2 contracts	254,077	7	70	0.72%
26	UNITEDHEALTHCARE OF NEW YORK, INC. 2 contracts	253,664	1	61	0.72%
27	UHC OF CALIFORNIA 1 contracts	253,288	3	35	0.72%
28	HIGHMARK SENIOR HEALTH COMPANY 1 contracts	235,332	41	452	0.67%
29	ALIGNMENT HEALTH PLAN 2 contracts	226,948	1	26	0.64%
30	HealthKeepers, Inc. 3 contracts	202,849	3	296	0.57%
31	COMMUNITY INSURANCE COMPANY 3 contracts	199,891	2	173	0.57%
32	PHYSICIANS HEALTH CHOICE OF TEXAS, LLC 1 contracts	196,304	1	63	0.56%
33	HUMANA HEALTH BENEFIT PLAN OF LOUISIANA, INC. 1 contracts	193,372	1	64	0.55%
34	BLUECROSS BLUESHIELD OF TENNESSEE, INC. 1 contracts	187,351	5	101	0.53%
35	BLUE CROSS AND BLUE SHIELD OF NORTH CAROLINA 4 contracts	181,685	2	101	0.51%
36	CAREPLUS HEALTH PLANS, INC. 1 contracts	170,173	1	22	0.48%
37	HEALTH CARE SERVICE CORPORATION 4 contracts	165,307	44	592	0.47%
38	PEOPLES HEALTH, INC. 2 contracts	160,207	1	64	0.45%
39	BLUE CROSS OF CALIFORNIA PARTNERSHIP PLAN, INC. 2 contracts	156,157	2	26	0.44%
40	UNITEDHEALTHCARE INSURANCE COMPANY 4 contracts	154,639	32	447	0.44%
41	UNITEDHEALTHCARE COMMUNITY PLAN OF TEXAS, L.L.C. 2 contracts	154,375	1	116	0.44%
42	CLOVER INSURANCE COMPANY 1 contracts	152,315	5	176	0.43%
43	UNITEDHEALTHCARE OF THE ROCKIES, INC. 2 contracts	147,102	3	72	0.42%
44	BRAVO HEALTH PENNSYLVANIA, INC. 4 contracts	144,629	7	100	0.41%
45	NETWORK HEALTH INSURANCE CORPORATION 2 contracts	130,183	3	53	0.37%
46	UPMC HEALTH PLAN, INC. 1 contracts	129,640	2	46	0.37%
47	AETNA HEALTH OF OHIO INC. 1 contracts	128,307	2	175	0.36%
48	MEDICA HEALTH PLANS 3 contracts	126,296	7	157	0.36%
49	HUMANA EMPLOYERS HEALTH PLAN OF GEORGIA, INC. 1 contracts	123,973	1	90	0.35%
50	CALIFORNIA PHYSICIANS' SERVICE 4 contracts	121,408	23	161	0.34%
51	AETNA HEALTH INC. (FL) 1 contracts	120,605	2	126	0.34%
52	TUFTS ASSOCIATED HEALTH MAINTENANCE ORGANIZATION 3 contracts	118,308	1	10	0.34%
53	COVENTRY HEALTH AND LIFE INSURANCE COMPANY 1 contracts	117,790	11	481	0.33%
54	MEDICA INSURANCE COMPANY 1 contracts	115,912	7	183	0.33%
55	SILVERSCRIPT INSURANCE COMPANY 1 contracts	115,763	2	226	0.33%
56	KAISER FDTN HLTH PLAN OF THE MID-ATLANTIC STATES 1 contracts	114,901	3	24	0.33%
57	COVENTRY HEALTH CARE OF MISSOURI, INC. 1 contracts	113,669	5	213	0.32%
58	BLUE CROSS AND BLUE SHIELD OF ALABAMA 1 contracts	113,566	1	67	0.32%
59	KAISER FOUNDATION HP OF CO 1 contracts	113,220	1	17	0.32%
60	NEW YORK QUALITY HEALTHCARE CORPORATION 2 contracts	110,685	1	61	0.31%
61	KAISER FOUNDATION HP OF THE N W 1 contracts	109,347	2	19	0.31%
62	AETNA HEALTH INC. (NY) 1 contracts	102,925	1	62	0.29%
63	COVENTRY HEALTH CARE OF ILLINOIS, INC. 2 contracts	101,465	2	104	0.29%
64	KAISER FOUNDATION HEALTH PLAN OF WASHINGTON 1 contracts	98,904	2	13	0.28%
65	COMPCARE HEALTH SERVICES INSURANCE CORPORATION 1 contracts	93,471	2	188	0.26%
66	FREEDOM HEALTH, INC. 1 contracts	91,469	1	24	0.26%
67	KEYSTONE HEALTH PLAN EAST, INC. 1 contracts	91,317	1	6	0.26%
68	HUMANA INSURANCE COMPANY OF NEW YORK 1 contracts	88,159	1	62	0.25%
69	HEALTH ALLIANCE PLAN OF MICHIGAN 1 contracts	87,154	1	56	0.25%
70	BCBS OF MASSACHUSETTS HMO BLUE, INC. 2 contracts	86,266	6	23	0.24%
71	HIGHMARK CHOICE COMPANY 1 contracts	81,748	1	59	0.23%
72	OPTIMUM HEALTHCARE, INC. 1 contracts	80,384	1	21	0.23%
73	OXFORD HEALTH PLANS (NJ), INC. 1 contracts	80,256	3	90	0.23%
74	SECURITY HEALTH PLAN OF WISCONSIN, INC. 1 contracts	79,317	1	53	0.22%
75	UNITEDHEALTHCARE PLAN OF THE RIVER VALLEY, INC. 1 contracts	77,213	1	95	0.22%
76	BLUE CROSS & BLUE SHIELD OF RHODE ISLAND 2 contracts	75,769	5	17	0.21%
77	MEDICAL MUTUAL OF OHIO 2 contracts	72,716	2	42	0.21%
78	GEISINGER HEALTH PLAN 1 contracts	72,139	1	46	0.20%
79	UNITEDHEALTHCARE OF FLORIDA, INC. 1 contracts	71,375	1	64	0.20%
80	ARIZONA PHYSICIANS IPA, INC. 1 contracts	70,460	1	15	0.20%
81	CAPITAL DISTRICT PHYSICIANS' HEALTH PLAN, INC. 1 contracts	69,157	1	23	0.20%
82	HEALTHSUN HEALTH PLANS, INC. 1 contracts	67,481	1	4	0.19%
83	AETNA HEALTH AND LIFE INSURANCE COMPANY 1 contracts	67,182	3	269	0.19%
84	MARTIN'S POINT GENERATIONS ADVANTAGE, INC. 2 contracts	66,339	1	16	0.19%
85	SELECTHEALTH, INC. 1 contracts	66,049	5	37	0.19%
86	Preferred Care Network, Inc. 1 contracts	64,920	1	2	0.18%
87	VNS CHOICE 1 contracts	64,662	1	15	0.18%
88	PROVIDENCE HEALTH ASSURANCE 1 contracts	64,428	3	21	0.18%
89	DEVOTED HEALTH PLAN OF OHIO INC 2 contracts	64,410	1	73	0.18%
90	AMERICAN PROGRESSIVE LIFE & HLTH INS COMPANY OF NY 2 contracts	62,861	2	73	0.18%
91	BLUE CROSS AND BLUE SHIELD OF FLORIDA, INC. 1 contracts	61,731	2	67	0.17%
92	BLUE CARE NETWORK OF MICHIGAN 1 contracts	61,510	1	68	0.17%
93	AETNA HEALTH INC. (CT) 1 contracts	59,367	4	20	0.17%
94	MVP HEALTH PLAN, INC. 2 contracts	58,711	5	69	0.17%
95	UNITEDHEALTHCARE OF THE MID-ATLANTIC, INC. 2 contracts	58,661	3	154	0.17%
96	MOUNT CARMEL HEALTH PLAN, INC. 1 contracts	58,559	2	99	0.17%
97	UPMC HEALTH NETWORK, INC. 1 contracts	58,015	1	44	0.16%
98	HARMONY HEALTH PLAN, INC. 1 contracts	57,924	4	206	0.16%
99	HEALTHPARTNERS, INC. 3 contracts	56,396	3	43	0.16%
100	AETNA BETTER HEALTH INC. (GA) 1 contracts	56,311	3	190	0.16%

Source: CMS Monthly MA Enrollment by State/County/Contract (May 2026, abridged). Counts roll up every plan/contract held by each organization across all US counties. Excludes territories. Enrollment counts ≤ 10 are excluded from the underlying CMS file (HIPAA suppression).