Newsroom · San Diego County, California

Blue Shield Medicare Advantage Plans in San Diego for 2027

Blue Shield of California announced its 2027 Medicare lineup on October 1 without naming a county, a plan or a price. The CMS file and Blue Shield's own Summaries of Benefits fill that in for San Diego County: four $0 HMOs, two of them new with caps under $500. For a Sharp Direct Advantage member reading this as a possible landing spot, there is one caution that comes before any number.

Medicare On Main Data Desk

Published October 8, 2026 · 8 min read · Reviewed by Brian Penner

This is the seventh post in our series on Sharp Direct Advantage ending, and the first about a carrier that is arriving rather than leaving. We have covered the exit itself, the county's 22 departing plans, keeping your Sharp doctors, the Medigap door, the UnitedHealthcare plans with Sharp in the name and what happens if you do nothing. This one is for the 19,697 Sharp Health Plan members in the county, and for anyone else shopping San Diego's 2027 shelf, who saw Blue Shield's October 1 announcement and wants to know what it actually means here. Carrier and health-system names are factual reporting, not endorsement or criticism; nothing here is a recommendation; we do not offer every plan available in your area.

What the October 1 announcement says, and what it does not

Blue Shield's release (news.blueshieldca.com) is dated Oakland, October 1, 2026 and describes "its 2027 Medicare plans" statewide. Here is a fair summary of what is in it:

Source: the press release linked above, read October 8, 2026. Quotations are Blue Shield's words; paraphrases are ours.

That is normal for a carrier announcement, and it is not a criticism. But it means that a San Diego reader cannot learn from the release which plans are sold here, what they cost or who is in the network. For that you need two other documents, and both are public.

What the CMS file shows for San Diego County

Sources: CMS CY2026 and CY2027 landscape files, San Diego County rows, matched by Contract ID and Plan ID on October 8, 2026; CMS Monthly Enrollment by Contract/Plan/State/County, September 2026. "Cap" is the file's in-network maximum out-of-pocket; "drug ded." is the Part D deductible. Premiums are the consolidated Part C + D premium; everyone also pays the Part B premium. Star Ratings for 2027 are blank in the file until CMS publishes them. The Dual Special Needs Plan is for people with both Medicare and Medi-Cal only. Listing a plan is not a recommendation.

Three observations, from the numbers only. First, Blue Shield's existing San Diego membership is small for a carrier its size: 1,931 on 65 Plus and 2,591 on AdvantageOptimum in September, against 7,440 on the dual plan and against 19,697 on Sharp Health Plan's plans. Second, the two continuing general plans drift upward in the usual 2027 way, caps up $50 and $200, drug deductibles up $50. Third, the two new plans are the story: $499 and $500 in-network caps are among the lowest in the county's file (the 2027 range in San Diego runs from $295 to $9,850), and they are new plan numbers with no history, no members and no Star Rating.

Checking the sub-$500 caps against Blue Shield's own documents

A number that low deserves a second source, so we read the 2027 Summaries of Benefits Blue Shield has posted for San Diego County. For Blue Shield Advantage (HMO): "Monthly plan premium ... $0," "Health plan deductible $0," and under "Annual maximum out-of-pocket amount": "This is the most you would pay for the year for in-network covered Medicare Part A and Part B services. $499." The Value Advantage Plan document carries the same wording with $500, and 65 Plus with $1,800. All three show the Part D "Stage 1: Annual deductible $300," with the note that it "doesn't apply to Tier 1 and Tier 2, covered insulin products and most adult Part D vaccines."

So the CMS figures are real. What they are not is a cost estimate. The cap is a ceiling on in-network Part A and B cost sharing; the copays under it, the referral rules, the medical groups in the network and the drug tiers decide what a year actually costs, and none of that is in the CMS file. We have deliberately not quoted a single copay from the Summaries of Benefits here, because a copay out of context is how people choose the wrong plan. Read the document for the plan you are considering, all of it, and put it next to your 2026 Evidence of Coverage.

The Sharp question, answered as far as the public record goes

If you are a Sharp Direct Advantage member, the plan you are leaving was built around Sharp's hospitals and medical groups, and the first thing you want to know about any new plan is whether your doctors are in it. Here is what can be said from public sources on October 8:

• Sharp HealthCare's accepted-plans page lists, under Medicare: Original Medicare, "All Medicare Supplement (Medigap) Plans," TRICARE for Life, Sharp Health Plan's individual and group plans, and a list of UnitedHealthcare individual plans plus a UnitedHealthcare group retiree plan. It carries the line "Sharp accepts these plans through the end of 2026."
• No Blue Shield of California Medicare Advantage plan appears on that page.
• Blue Shield's release describes "a tailored and exclusive network of providers" without naming one.

We are not saying a Blue Shield plan excludes Sharp doctors; a hospital's accepted-plans page is a statement about today, and networks are set plan by plan. We are saying that nothing public says it includes them, and that "Blue Shield" on a card is not "Sharp" on a card. The only reliable check is the one we described in the doctors post: look up each of your physicians by name in the 2027 directory for the specific Blue Shield plan, note which medical group the directory lists them under, and call the office to confirm they will take that plan in January. If the answer is no and keeping Sharp is the point, the paths that keep every Sharp doctor are the ones Sharp's own page lists: a UnitedHealthcare plan on that list, or Original Medicare with a Medigap policy, which has no network at all.

What the CMS file cannot show you

Sources: the landscape file's own column list; Blue Shield's Summaries of Benefits for the deductible note; Medicare Plan Compare for copays and drug costs by plan.

Where Blue Shield sits among the three doors

For a Sharp Direct Advantage member the doors have not changed. Door one is another Medicare Advantage plan on the county shelf, chosen October 15 – December 7 for a January 1 start (Medicare.gov), with the discontinued-plan Special Enrollment Period, December 8 – February 28, as a backstop that starts coverage on the first of the following month (42 CFR § 422.62). The four Blue Shield plans are four of the 41 choices behind that door; the full county list, what left and what arrived, is on the San Diego County reference page. Door two is Original Medicare plus Medigap with no health questions, November 1, 2026 – March 4, 2027 (Medicare.gov), plus a stand-alone drug plan; Blue Shield also sells Medicare Supplement plans and drug plans in California, and the release says so, though it names no premium. Door three is doing nothing, which lands you in Original Medicare alone.

Nothing moves a Sharp Health Plan member into a Blue Shield plan on its own. They are different insurers under different CMS contracts, and the October 2 letter describes options; it does not enroll you in any.

What I would do this week

1. Download the Summary of Benefits for the Blue Shield plan that caught your eye and read the copay table, not just the cap line. The links above go straight to the San Diego County documents.
2. Look up every doctor by name in Blue Shield's 2027 directory for that plan, note the medical group, and call the office. Do this before October 15, so the enrollment window is spent choosing, not searching.
3. Run your prescriptions through Medicare.gov Plan Compare for the Blue Shield plans and for the stand-alone drug plans, so door one and door two are priced on the same page.
4. Decide what the cap is worth to you. A $499 ceiling with a network you have to rebuild and a $2,900 ceiling you used to have with every Sharp doctor are different products, and a Medigap policy with no network is a third.
5. Enroll between October 15 and December 7. A December 8 to 31 enrollment is the last one that still starts January 1.

How we know all this: the Medicare On Main Data Desk frames every article with public data — here, Blue Shield of California's October 1, 2026 press release, the CMS CY2026 and CY2027 landscape files compared by Contract ID and Plan ID on October 8, 2026, Blue Shield's posted 2027 Summaries of Benefits for San Diego County, the CMS September 2026 county enrollment file, Sharp HealthCare's accepted-plans page, and Medicare.gov's pages on enrollment periods and Medigap guaranteed-issue rights. Mentioning a carrier or a health system is factual reporting, not endorsement or criticism, and nothing here is a recommendation of one plan over another. Copays, formularies and networks are not in any CMS file and are deliberately not described. This is education, not advice; confirm plans, costs and eligibility with the plan, a licensed agent, HICAP or Medicare.gov. We take no payment from any carrier to feature a plan.