Four plan types, and which ones go together
A comparison of four plan types: the ACA Marketplace, Medicare Advantage, Medicare Supplement and Medicare Part D. The Marketplace is for people not on Medicare; the other three are for people on Medicare or turning 65. For each it shows who it is for, what it covers, and when you can enroll: the Marketplace from November 1 to January 15 or 60 days after a life event; Medicare Advantage and Part D from October 15 to December 7, with January 1 to March 31 to switch if you are already in an Advantage plan; and a Medicare Supplement in a one-time six-month window that starts when you have Part B at 65. The two Medicare paths are Medicare Advantage on its own, or Original Medicare with a Supplement and a Part D plan. You pick one path, not both, because a Medigap policy can't be used with a Medicare Advantage plan. Premiums, networks and drug lists differ by plan, county and year, so this compares plan types, not specific plans.
Four plan types, and which ones go together
Sources: Medicare.gov enrollment rules; HealthCare.gov Marketplace dates, checked September 2026
Not on Medicare
On Medicare, or turning 65
ACA
Marketplace
Individual plans
Medicare
Advantage
Part C
Medicare
Supplement
Medigap
Medicare
Part D
Drug plan
Who it's for
Under 65 and
buying your own
coverage
On Medicare and
comfortable with a
network
On Original
Medicare, wants help
with its costs
Anyone on Original
Medicare
What it covers
A whole private
plan: doctors,
hospital, drugs
Part A and Part B
in one plan, drugs
usually in it
The gaps Original
Medicare leaves
you to pay
Prescriptions
only, from that
plan's drug list
When to enroll
Nov 1 – Jan 15, or
60 days after a
life event
Oct 15 – Dec 7.
Jan 1 – Mar 31 if
already in one
One time only: 6
months from Part B
at 65
Oct 15 – Dec 7,
every year
Which pair up
On its own. Not a
Medicare plan.
One path
Advantage alone
The other path
Original Medicare + Supplement + Part D
You pick one path, not both: a Medigap policy can't be used with a Medicare Advantage plan.
When you first become eligible for Medicare you get your own enrollment window as well.
Premiums, networks and drug lists differ by plan, county and year, so check your doctors and prescriptions too.
This chart compares plan types, not specific plans. Benefits and availability vary by where you live.
Four plan types, and which ones go together
A comparison of four plan types: the ACA Marketplace, Medicare Advantage, Medicare Supplement and Medicare Part D. The Marketplace is for people not on Medicare; the other three are for people on Medicare or turning 65. For each it shows who it is for, what it covers, and when you can enroll: the Marketplace from November 1 to January 15 or 60 days after a life event; Medicare Advantage and Part D from October 15 to December 7, with January 1 to March 31 to switch if you are already in an Advantage plan; and a Medicare Supplement in a one-time six-month window that starts when you have Part B at 65. The two Medicare paths are Medicare Advantage on its own, or Original Medicare with a Supplement and a Part D plan. You pick one path, not both, because a Medigap policy can't be used with a Medicare Advantage plan. Premiums, networks and drug lists differ by plan, county and year, so this compares plan types, not specific plans.
Four plan types, and which ones go
together
Sources: Medicare.gov enrollment rules;
HealthCare.gov dates, checked Sept. 2026
Not on Medicare
ACA Marketplace
Individual plans
Who it's for
Under 65 and buying your own
coverage
What it covers
A whole private plan: doctors, hospital,
drugs
When to enroll
Nov 1 – Jan 15, or 60 days after a life
event
Which pair up
On its own. Not a Medicare plan.
On Medicare, or turning 65
Medicare Advantage
Part C
Who it's for
On Medicare and comfortable with a
network
What it covers
Part A and Part B in one plan, drugs
usually in it
When to enroll
Oct 15 – Dec 7. Jan 1 – Mar 31 if already
in one
Which pair up
One path: Advantage alone
Medicare Supplement
Medigap
Who it's for
On Original Medicare, wants cost help
What it covers
The gaps Original Medicare leaves you to
pay
When to enroll
One time only: 6 months from Part B at 65
Which pair up
The other path: Original Medicare +
Supplement + Part D
Medicare Part D
Drug plan
Who it's for
Anyone on Original Medicare
What it covers
Prescriptions only, from that plan's drug
list
When to enroll
Oct 15 – Dec 7, every year
Which pair up
The other path: Original Medicare +
Supplement + Part D
One path
Advantage alone
The other path
Original Medicare + Supplement + Part D
You pick one path, not both: a Medigap
policy can't be used with a Medicare
Advantage plan.
Premiums, networks and drug lists differ by
plan, county and year, so check your
doctors and prescriptions too.
When you first become eligible for Medicare
you get your own enrollment window as well.
This chart compares plan types, not
specific plans. Benefits and availability
vary by where you live.
Sources: Medicare.gov enrollment rules and HealthCare.gov Marketplace dates, checked September 2026.