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PlainMedicare

Plan year 2026 · coverage ends Dec. 31, 2026CMS crosswalk of Oct. 1, 2026

Blue Cross Medicare Advantage Basic is not offered under this ID in 2027

H3979Contract001Plan

HMO · served 28 counties in Oklahoma in 2026

Run by Ghs Health Maintenance Organization, Inc. (contract H3979), sold as Blue Cross and Blue Shield of Oklahoma, owned by Health Care Service Corporation

CMS crosswalk: renews as H4513-103 in 6 of its 28 counties; in the others the plan ends

Renews in part

Blue Cross Medicare Advantage Basic (H3979-001) is not offered under this ID in 2027. The CMS plan crosswalk of October 1, 2026 moves its members into HealthSpring Preferred (H4513-103) (the plan renews under a new ID), in the 6 counties where that plan is sold (2,208 members in September 2026). In its other 22 counties (921 members) there is no plan to move into: coverage ends December 31, 2026, and members there need to choose a new plan (counties with fewer than 11 members are not counted).

What changes for its members in HealthSpring Preferred?

For members in the 6 counties where HealthSpring Preferred is sold: this plan's 2026 amounts beside HealthSpring Preferred (H4513-103) in 2027. The changed lines are marked and come first.
What you pay or get20262027Change
Plan nameBlue Cross Medicare Advantage BasicHealthSpring Preferredrenamed
In-network out-of-pocket limit$4,200$3,500down $700
Drug deductible$450$500up $50
Specialist visit$35 copay$25 copaydown $10
Emergency room$120 copay$150 copayup $30
Hospital stay, in network$400 a day for days 1–6, then $0 a day for days 7–90$300 a day for days 1–5, then $0 a day for days 6–90down $500for a 5-day stay
Skilled nursing facility, in network$0 a day for days 1–20, then $218 a day for days 21–49, then $0 a day for days 50–100$20 a day for days 1–20, then $221 a day for days 21–100up $430for a 30-day stay
Eyewear, yearly limit$100 a year$300 a yearup $200
Over-the-counter items, yearly$240 a year$260 a yearup $20
Counties served286down 22
Drug tier 1, preferred generic$5$10up $5
Drug tier 2, generic$6$20up $14
Drug tier 3, preferred brand19% of the cost14% of the costdown 5 points
Drug tier 4, non-preferred drug40% of the cost25% of the costdown 15 points
Drug tier 5, specialty tier27% of the cost28% of the costup 1 point
7 lines do not change
Monthly premium$0$0no change
Part B premium reduction, monthlynonenoneno change
Primary care visit$0 copay$0 copayno change
Medical deductible, in networknonenoneno change
Ground ambulance, in network$250 copay$250 copayno change
Comprehensive dental, yearly limitnot offerednot offeredno change
Hearing aids, yearly limit for both earsnot offerednot offeredno change

Source: CMS plan crosswalk from 2026 to 2027 (Oct. 1, 2026); CMS Medicare Advantage and Part D landscape files for 2027 (Sept. 22, 2026, revised Sept. 30) and 2026 (Sept. 2, 2026 revision); CMS plan benefit package files, 2027 and 2026. Your plan's Annual Notice of Change is the letter that confirms your 2027 plan; confirm on Medicare Plan Finder.

What can members do, and by when?

If you live in Canadian (OK), Cleveland (OK), Lincoln (OK), Logan (OK), McClain (OK), Oklahoma (OK)

If you do nothing
You are moved into HealthSpring Preferred on January 1, 2027.
October 15 to December 7, 2026
Open enrollment: choose another Medicare Advantage plan, or Original Medicare with a drug plan, instead.

If you live in Blaine (OK), Bryan (OK), Carter (OK), Cherokee (OK), Custer (OK), Garfield (OK), Garvin (OK), Grady (OK), Hughes (OK), Kay (OK), Love (OK), Marshall (OK), McIntosh (OK), Nowata (OK), Okfuskee (OK), Okmulgee (OK), Osage (OK), Pawnee (OK), Pontotoc (OK), Seminole (OK), Tulsa (OK), Washington (OK)

Your coverage
Ends December 31, 2026: HealthSpring Preferred is not sold where you live.
October 15 to December 7, 2026
Open enrollment: join another Medicare Advantage plan, or Original Medicare with a drug plan. Coverage starts January 1, 2027.
December 8, 2026 to the end of February 2027
A special enrollment period because the plan is leaving: you can still join a plan, but coverage starts the first day of the month after you join, so choose by December 31 to have no gap.
If you do nothing
You are enrolled in Original Medicare when the plan ends, without a drug plan unless you join one (with Extra Help or full Medicaid, Medicare enrolls you in one).
Without a drug plan
Going 63 days or more in a row without drug coverage can mean a late enrollment penalty if you join a drug plan later; joining by the end of February keeps a January and February gap under 63 days, waiting longer does not.

Source: Medicare.gov, “Special enrollment periods” and “Joining a plan” (read Oct. 7, 2026).

Where did its members live?

Where its members lived in September 2026; each county and state page lists the 2027 plans sold there.

All 28 counties, most members first; CMS hides counts under 11 per county, so the counties add up to a little less than the plan's total
CountyMembers, Sept. 2026For 2027
Oklahoma, OK1,343moves into H4513-103
Cleveland, OK352moves into H4513-103
Canadian, OK284moves into H4513-103
Tulsa, OK246plan ends here
Grady, OK102plan ends here
Logan, OK98moves into H4513-103
Kay, OK79plan ends here
Lincoln, OK74moves into H4513-103
Carter, OK66plan ends here
Washington, OK60plan ends here
Garfield, OK57plan ends here
McClain, OK57moves into H4513-103
Cherokee, OK36plan ends here
Pontotoc, OK31plan ends here
Custer, OK29plan ends here
Seminole, OK27plan ends here
Blaine, OK25plan ends here
Garvin, OK23plan ends here
Okmulgee, OK22plan ends here
Osage, OK22plan ends here
Show the other 8 counties
CountyMembers, Sept. 2026For 2027
Bryan, OK20plan ends here
McIntosh, OK19plan ends here
Pawnee, OK18plan ends here
Love, OK15plan ends here
Marshall, OK12plan ends here
Okfuskee, OK12plan ends here
Hughes, OKfewer than 11plan ends here
Nowata, OKfewer than 11plan ends here

Source: CMS monthly enrollment by plan and by county, September 2026 (CMS hides counts under 11).

What else should you check?