Medicare contract · plan years 2026 and 2027CMS landscape and crosswalk

Health Care Service Corporation (H8634)

H8634Contract

A company of Health Care Service Corporation, sold as Blue Cross and Blue Shield of IL, NM, OK, TX

0 plans in 2027 (21 in 2026) · 26,008 members in September 2026

No plans in 2027

2026 rating: 3 of 5

Health Care Service Corporation is the Health Care Service Corporation company that holds Medicare contract H8634, sold as Blue Cross and Blue Shield of IL, NM, OK, TX. In 2027 it offers 0 plans (21 in 2026); 21 of its 2026 plans are not offered in 2027. 26,008 people were in its plans in September 2026.

Which of its plans end?

2026 plan	Members, Sept. 2026	Counties in 2026
Blue Cross Medicare Advantage Choice PlusH8634-003	6,729	9
Blue Cross MA Dual Care Plus PreferredH8634-009	4,658	27
Blue Cross Medicare Advantage Dental PremierH8634-024	3,099	113
Blue Cross Medicare Advantage Choice PremierH8634-004	3,031	36
Blue Cross Medicare Advantage CompleteH8634-023	1,097	108
Blue Cross Medicare Advantage ClassicH8634-027	1,017	44
Blue Cross Medicare Advantage EssentialH8634-012	994	39
Blue Cross Medicare Advantage Dental PremierH8634-021	856	66
Blue Cross Medicare Advantage ClassicH8634-010	815	7
Blue Cross Medicare Advantage Health ChoiceH8634-018	665	66
Blue Cross Medicare Advantage PreferredH8634-033	641	83
Blue Cross Medicare Advantage ClassicH8634-022	533	5
Blue Cross Medicare Advantage ClassicH8634-008	405	2
Blue Cross Medicare Advantage Dental PremierH8634-029	405	44
Blue Cross Medicare Advantage Health ChoiceH8634-030	266	44
Blue Cross Medicare Advantage Health ChoiceH8634-025	261	113
Blue Cross Medicare Advantage OptimumH8634-032	211	58
Blue Cross Medicare Advantage BalanceH8634-031	164	58
Blue Cross Medicare Advantage ProtectH8634-026	82	113
Blue Cross Medicare Advantage ProtectH8634-028	41	44
Blue Cross Medicare Advantage ProtectH8634-019	38	66

Source: CMS plan crosswalk from 2026 to 2027 (Oct. 1, 2026); CMS monthly enrollment by plan and by county, September 2026 (CMS hides counts under 11).

Which employer and union group plans does it hold?

H8634 also holds 15 group plans offered through former employers and unions, with 1,336 members in September 2026 (plans with fewer than 11 not counted). They are not sold to individuals, so the landscape files list no premiums or benefits for them; the employer or union sends their 2027 terms.

Plan ID	Plan name	Members, Sept. 2026	2027
H8634-801	Blue Cross Group Medicare Advantage Plan	99	renews
H8634-803	Blue Cross Group Medicare Advantage Plan	fewer than 11	not offered in 2027
H8634-805	Blue Cross Group Medicare Advantage Plan	fewer than 11	renews
H8634-807	Blue Cross Group Medicare Advantage Plan	69	renews
H8634-809	Blue Cross Group Medicare Advantage Plan	fewer than 11	not offered in 2027
H8634-811	Blue Cross Group Medicare Advantage Plan	fewer than 11	not offered in 2027
H8634-813	Blue Cross Group Medicare Advantage Plan	1,081	renews
H8634-815	Blue Cross Group Medicare Advantage Plan	87	renews
H8634-817	Blue Cross Group Medicare Advantage Plan	fewer than 11	not offered in 2027
H8634-819	Blue Cross Group Medicare Advantage Plan	fewer than 11	not offered in 2027
H8634-820	Blue Cross Group Medicare Advantage Plan	fewer than 11	not offered in 2027
H8634-821	Blue Cross Group Medicare Advantage Plan	fewer than 11	renews
H8634-822	Blue Cross Group Medicare Advantage Plan	fewer than 11	not offered in 2027
H8634-823	Blue Cross Group Medicare Advantage Plan	fewer than 11	not offered in 2027
H8634-824	Blue Cross Group Medicare Advantage Plan	fewer than 11	renews

Source: CMS monthly enrollment by plan and by county, September 2026 (CMS hides counts under 11); CMS plan crosswalk from 2026 to 2027 (Oct. 1, 2026).

How did CMS rate it for 2026?

The overall rating is 3 of 5 (health plan 3 of 5, drug plan 2.5 of 5). Of its 40 rated measures, the lowest and the highest:

Lowest-rated measures	Stars
Kidney Health Evaluation for Patients with Diabetes	1
Medication Adherence for Hypertension (RAS antagonists)	1
Special Needs Plan (SNP) Care Management	2
Osteoporosis Management in Women who had a Fracture	2

Highest-rated measures	Stars
Medication Adherence for Cholesterol (Statins)	5
Diabetes Care – Eye Exam	5
Getting Needed Prescription Drugs	4
Drug Plan Quality Improvement	4

Source: CMS Part C and D Star Ratings data tables, 2026 (October 2025).

What else should you check?

All Blue Cross and Blue Shield of IL, NM, OK, TX plansEvery contract of the brand
Star ratings of every contractThe 2026 ratings, and 2027 when CMS publishes them
Find a plan by its IDFrom the card or a letter