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For the basic parts — Medicare Part B (medical insurance) and Medicare Part A (hospital insurance) — the standard monthly premiums are the same nationwide (i.e. they do not vary by state). ehealth+2CMS+2
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For Part B, the standard premium for 2026 is $202.90/month. CMS
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However, some people pay more than the standard premium for Part B (and/or for prescription-drug coverage Medicare Part D) — that extra amount depends on their income, not on their state. Social Security+1
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On the other hand, if someone uses a private plan under Medicare — for example Medicare Advantage (Part C) or a supplemental plan like Medigap — those premiums can vary by state (and even by county or insurer) because they are offered by private insurance companies rather than the federal program. Medicare Advantage+2Medicare Agents Hub+2
So in short:
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Original Medicare Part A/B: premiums are the same across the U.S. (except adjustments for income).
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Private or supplemental Medicare plans: premiums often differ depending on the state (or even more local factors).
Since you are in Ashburn, Virginia — that means your basic Part B premium is the same as someone in any other state. If you or a friend has a Medicare Advantage or Medigap plan, then costs may differ depending on plan and insurer.
If you like — I can check what typical Medicare-related premiums are in Virginia now (Part B, Advantage, Medigap) so you get a concrete estimate.