Accepting Original Medicare — No HMO Restrictions, No Referrals Needed
Oasis Medical Group proudly welcomes Original (Straight) Medicare and Medigap patients in Vista and throughout San Diego County. Keep the freedom to see Dr. Kareem Moasis and the specialists you trust — no network restrictions, no referral delays.
Understanding Your Options During Medicare Open Enrollment
Every year during Medicare's Annual Enrollment Period (October 15 – December 7), seniors can switch between Original Medicare and a Medicare Advantage plan — often with added perks like dental or vision coverage. This Medicare window is separate from Covered California / commercial open enrollment (typically November 1 – January 31 for plans like Blue Shield). Medicare Advantage can be a good fit for some patients — but it's worth understanding what changes before you switch.
A few things to consider before switching plans:
- ✓Network changes: Medicare Advantage plans often use a narrower network, which may mean a doctor or specialist you currently see is no longer covered.
- ✓Prior authorization: Some tests, scans, and specialist referrals may require insurance approval first, which can add waiting time.
- ✓Assigned primary care gatekeeper: Many Medicare Advantage plans require your primary care provider to approve referrals before you can see a specialist.
If you're considering a switch, it's worth calling our office first so we can help you understand how it may affect your care here.
On a different plan? See our full Insurance Accepted page for Blue Shield, Anthem, Tricare / TriWest, Cigna, Aetna PPO, and United Healthcare.
Why Patients Choose Original Medicare + Oasis Medical Group
We do not participate in capitated IPA arrangements that limit which doctors our patients can see.
Prior authorizations
Original Medicare + Medigap (Oasis)
Rarely needed for routine care
Medicare Advantage
Often required for tests, scans, specialist referrals
Access to Dr. Moasis
Original Medicare + Medigap (Oasis)
Direct, ongoing relationship
Medicare Advantage
Subject to network/plan changes
Specialist access
Original Medicare + Medigap (Oasis)
Nationwide, any Medicare-accepting provider
Medicare Advantage
Limited to plan's local network
Referral process
Original Medicare + Medigap (Oasis)
Not required for most specialists
Medicare Advantage
Often requires PCP approval first
Helping a Parent Navigate Medicare?
If you help manage healthcare decisions for an aging parent in San Diego County, understanding how a plan change could affect their care is worth a few minutes before anything is signed.
Before your parent switches plans, feel free to call us. We're happy to answer questions about how a change might affect their ongoing care at Oasis Medical Group — no pressure, just information.
Call 760-691-1901Frequently Asked Questions
Yes. We accept Original (Straight) Medicare and Medigap plans, with no network restrictions.
In most cases, no — Original Medicare generally does not require a referral or prior authorization for specialist visits.
Possibly — some Medicare Advantage plans use networks that may not include our office. Call us before switching so we can help you understand your options.
Yes. Original Medicare patients have direct, ongoing access to Dr. Moasis without network restrictions.
Yes, we're currently accepting new patients on Original Medicare. Call 760-691-1901 to schedule.
Ready to Keep Your Care Simple?
Oasis Medical Group is an independent medical practice committed to transparent, patient-first healthcare. Serving Vista, Oceanside, Carlsbad, and surrounding North County communities.
- 906 Sycamore Ave, Suite 201, Vista, CA 92081
- Mon–Fri 8:30 AM–5:00 PM