Medicare in Guam: 2025 Guide
Guam, as a US territory, has a unique and often disadvantaged relationship with Medicare. Residents of Guam who qualify for Medicare are enrolled in the same program as mainland Americans, but the territory faces structural funding disparities, very limited Medicare Advantage options, and healthcare access challenges that differ significantly from the 50 states. Understanding these differences is essential for Guam Medicare beneficiaries.
Medicare Advantage Plans in Guam
Guam's Medicare Advantage market is extremely limited. Unlike the 50 US states where MA plans are widely available, Guam has very few MA plan options and most beneficiaries rely on Original Medicare (Parts A and B) for their coverage. This is a structural challenge rooted in several factors unique to US territories:
- Federal funding disparities: US territories receive Medicare and Medicaid funding under a different formula than states. Guam receives a capped federal Medicaid match and faces lower per-capita Medicare reimbursements, making it less attractive for commercial MA insurers to enter the market.
- Limited provider infrastructure: Guam's healthcare system is anchored primarily by Guam Memorial Hospital Authority (GMHA) and a network of clinics. The limited pool of specialists and advanced facilities makes building adequate MA provider networks challenging.
- Island geography: Guam's location in the western Pacific, while manageable for intra-island care, complicates the logistics that MA insurers use to manage care costs.
When MA plans are available in Guam, they are limited in number and may have narrow networks. Most Guam Medicare beneficiaries use Original Medicare Parts A and B, and may supplement coverage through Medigap policies if available, or through Guam Medicaid for dual-eligible beneficiaries. It is strongly recommended that Guam residents contact the DPHSS SHIP program to understand exactly what plan options exist in their area at any given time.
Medicare Savings Programs in Guam
Medicare Savings Programs in Guam are administered through Guam Medicaid, under the Guam Department of Public Health and Social Services (DPHSS), Bureau of Health Care Financing. Guam Medicaid operates under a federal block grant cap rather than the open-ended federal matching funds available to states, which limits the program's resources.
Despite these funding constraints, Guam does administer MSP programs for eligible Medicare beneficiaries:
- Qualified Medicare Beneficiary (QMB): Pays Part A and Part B premiums, deductibles, and cost-sharing. Income limits follow federal guidelines (approximately $1,255/month for individuals in 2025), though Guam-specific cost-of-living considerations may affect applications.
- Specified Low-Income Medicare Beneficiary (SLMB): Pays the Part B premium only.
- Qualifying Individual (QI): Also pays the Part B premium; funded annually on a first-come, first-served basis.
To apply for a Medicare Savings Program in Guam, contact the Guam Department of Public Health and Social Services at (671) 735-7300 or visit the DPHSS Bureau of Health Care Financing office in Mangilao. MSP enrollment automatically qualifies you for federal Extra Help for Part D prescription drug costs.
State Pharmaceutical Assistance in Guam
Guam does not operate a State Pharmaceutical Assistance Program (SPAP). There is no territory-funded prescription drug supplement for Medicare beneficiaries above MSP income thresholds.
Given Guam's limited pharmacy infrastructure and the high cost of medications in the western Pacific, beneficiaries have fewer resources than mainland Americans but should explore:
- Extra Help / Low Income Subsidy: Federal program reducing Part D premiums and cost-sharing for eligible beneficiaries. Apply through Social Security at ssa.gov or by calling 1-800-772-1213. Social Security has offices that serve Guam.
- Medicare Part D Plans: Despite limited MA availability, standalone Medicare Part D prescription drug plans are generally available to Guam residents. Enrollment in a Part D plan is important to avoid late enrollment penalties if you later move to a state with more coverage options.
- Pharmaceutical Manufacturer Programs: Many US mainland drug manufacturers have patient assistance programs available to Guam residents. Contact the DPHSS SHIP for help identifying applicable programs.
- Veterans Affairs (VA) Benefits: Guam has a significant veteran population. Veterans eligible for VA pharmacy benefits may be able to obtain medications through the VA Pacific Islands Health Care System, which can substantially reduce drug costs.
Getting Free Medicare Help in Guam
Guam's State Health Insurance Assistance Program (SHIP) is administered through the Guam Department of Public Health and Social Services (DPHSS). SHIP counselors provide free, unbiased Medicare counseling to all Guam residents with Medicare, with no financial relationship with insurance companies.
Contact Guam SHIP (DPHSS):
- Phone: (671) 735-7416
- Address: Department of Public Health and Social Services, 123 Chalan Kareta, Mangilao, Guam 96913
- Website: dphss.guam.gov
Guam SHIP counselors can help you:
- Understand Original Medicare Parts A and B benefits and costs
- Identify available Medicare Advantage and Part D plans in Guam
- Apply for Guam Medicaid Medicare Savings Programs
- Apply for Extra Help (Low Income Subsidy) for prescription costs
- Understand how Medicare coordinates with VA benefits for veterans
- Navigate Medicare billing questions and appeals
Given Guam's unique Medicare environment, speaking with a SHIP counselor before making any coverage decisions is especially important, as plan availability and local resources change over time.
US territories including Guam, Puerto Rico, the US Virgin Islands, American Samoa, and the Northern Mariana Islands have historically received Medicare and Medicaid funding under formulas that differ from those applied to the 50 states. For Medicaid, territories receive capped block grants rather than open-ended federal matching funds, limiting what the programs can cover. For Medicare, reimbursement rates to providers in territories have historically been lower, making it less attractive for specialists and facilities to participate. Congress has periodically addressed some of these disparities through legislation, but territorial Medicare beneficiaries continue to face structural disadvantages compared to mainland Americans. Advocacy organizations and territorial governments continue to push for funding parity.
Yes. Original Medicare (Parts A and B) covers medically necessary care at any Medicare-participating provider anywhere in the United States, including the mainland. If you need specialized care not available in Guam — such as complex cardiac surgery, cancer treatment, or organ transplants — Original Medicare will cover those services if performed at a Medicare-participating facility on the mainland, subject to standard deductibles and coinsurance. Travel costs are generally not covered by Medicare. This is one reason why having a Medigap supplement (if available to Guam residents) can be valuable — it reduces cost-sharing when receiving expensive care. Contact the Guam SHIP at (671) 735-7416 to understand your current coverage options.
Yes, enrolling in Medicare Part D when you first become eligible is strongly recommended, even in Guam where plan options may be limited. If you go without creditable prescription drug coverage for 63 or more consecutive days after your initial enrollment window, you may face a permanent late enrollment penalty added to your Part D premium whenever you do enroll — for as long as you have Medicare. Even if your drug costs are currently low, enrolling protects you from this penalty and ensures you have drug coverage if your medication needs increase. If you move from Guam to a US state, having maintained Part D coverage avoids penalties and gaps. Contact the Guam SHIP at (671) 735-7416 or Social Security at 1-800-772-1213 for help enrolling.