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- The Birthday Rule: Sept '25 Update on Medicare Supplement OE / GI Rules 🎂
The Birthday Rule: Sept '25 Update on Medicare Supplement OE / GI Rules 🎂
6 new Birthday Rule Adopters. 4 pending. Get the latest updates on Birthday Rule adoption.
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Here is what you’ll find in this week’s newsletter!
Important links 🔗 - the best articles we found this week about the Medicare Market along with links to Jared’s recent LinkedIn posts.
Deep Dive 📚 - The Birthday Rule: Sept '25 Update on Medicare Supplement OE / GI Rules 🎂
Sponsor Snapshot 🚀 - brought to you by Medicare Market Insights +
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Here are IMPORTANT LINKS 🔗 for the week:
Samaritan Health dropping Medicare Advantage plans at end of year; nearly 5,000 affected in Lincoln County - (link)
Medicare Advantage penetration doesn’t translate to lower hospital margins: MedPAC - (link)
Tiny Protein Confirmed to Dismantle the Toxic Clumps Linked to Alzheimer’s Disease - (link)
Elevance cuts MA footprint, exits standalone Medicare prescription drug plans - (link)
UnitedHealth sees 78% of members in high-rated Medicare plans - (link)
Medicare Supplement Rate Filings – September 2025 - (link)
UCare to exit Medicare Advantage in 2026 - (link)
Analyze 1M Patient Records with AI - (link)
Jared’s recent LinkedIn posts:
DEEP DIVE 📚
The Birthday Rule: Sept '25 Update on Medicare Supplement OE / GI Rules 🎂
In Q3 2023, we discussed the rising trend of “The Birthday Rule” in state specific Medicare Supplement regulations.
Earlier this year we gave an update on the spread of the Birthday Rule.
Given the amount of activity, it’s time for another update.
Since that time:
4 of the 8 (IN, UT, VA, RI) pending states approved the birthday rule
1 (NM) failed
2 (WY and DE) additional states added the birthday rule
1 new state (MI) has pending birthday rules
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Background
It is well known that consumers have two main Medicare options:
Original Medicare + Medicare Supplement
Medicare Advantage
Medicare Advantage now makes up over 50% of the Medicare market, so let’s start there.
Medicare Advantage has annual plans. Each year, policyholders can shop for a plan that is best for them. Essentially, Medicare Advantage presents policyholders with the annual right to change plans and avoid medical underwriting.
Unlike Medicare Advantage, which is regulated federally, Medicare Supplement policies are regulated at the state level. This means there is no nationwide equivalent to the annual plan change opportunity in MA
However, several states decided to take this matter into their own hands. While there have been various approaches taken, the most popular way seems to be the Birthday rule.
Note: the Birthday rule allows consumers to change Medicare Supplement plans without underwriting around the time of their birthday each year.
To help keep track of the unique Open Enrollment and Guaranteed Issue rules in each state, check out this FREE guide, now equipped with a cheat sheet (brought to you by Telos Actuarial) →
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To stay up to date on the latest states hopping on the Birthday Rule bandwagon, KEEP READING.
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Pending New Birthday Rules
The 4 states with pending birthday rules are summarized in the table below.
State | New Plan Carrier | New Plan Letter | Annual Window |
---|---|---|---|
IA | Any Carrier | Equal or lesser benefits | 30 days |
NE | Any Carrier | Any Plan | 30 days |
MI | Any Carrier | Same Plan Only | 60 days |
OH | Any Carrier | Same Plan Only | 60 days |
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OE / GI Rules by State
In addition to the 4 pending states listed above, there are several states that already have some version of Open Enrollment / Guaranteed Issue rules.
The following map illustrates the various types by state.

Another interesting view is to look at these rules over time. Several states have had OE/GI rules since as early as 2009.
This year’s activity in the area has really picked up:

Combined:
41% of Medicare Supplement enrollees (based on inforce policies at YE ‘24) live in a state with some version of OE/GI Rules.
27% of Medicare Supplement enrollees (based on inforce policies at YE ‘24) live in a state with a Birthday Rule.
It will be interesting to track the progress of the currently proposed legislative bills and see how many additional states adopt such rules.
[Note: for monthly regulatory updates sign up for the Insurance Regulatory Insights newsletter which is now also part of an MMI+ subscription]
Likely Impacts
Traditionally, Medicare supplement plans realize profits towards the end of their lifetime.
When you add in a birthday rule, this makes things riskier for insurance carriers for a few reasons.
In general, a given carrier’s risk pool will have less underwritten lives simply because the rule drastically lowers the amount of underwriting taking place.
Additionally, with no potential for having to pass underwriting, policyholders will be best off selecting the newest product in the market with the cheapest rate each year. Similarly, agents will be best off collecting more top-level commissions in policy year 1. For new entrants, this results in a lot of anti-selection in year 1, followed by higher lapses in year’s 2+.
There are 3 main ways that carriers have combatted these risks in the past:
Increase Premium rates
Lower Commissions
Leave the Market
Last time we gave a few examples of how this has played out in some of the recent Birthday Rule adopter states (link).
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Conclusion
Birthday rules are not exactly black and white.
One one hand, they benefits policyholders by giving them more rights and the ability to shop policies each year.
On the other hand, they raise overall market premium rates and decrease competition.
Eventually these regulations may result in less differentiation, fewer new entrants, and higher premiums for all.
As these changes continue, insurers and agents must navigate shifting risk dynamics. We’ll be tracking these developments closely!
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