Rare Coin Service Level & Ins

I think it’s odd that the coin service (5) levels does not include a “Rarity” level but banknotes (12 levels) do, just curious.
My question to anyone is what do I do if I have a rare coin I want to submit through the express service level and I want to insure it for $100,000 hypothetically speaking. All I can find for USPS is $5000 insured value; where do I go or what do I have to do to ensure that my coin is insured.
Thanks everyone
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Comments
Registered goes up to $50,000 for USPS
For $100k or higher, you may need a reinsurer or courier
PCGS does offer a "Rarities" service level: https://www.pcgs.com/servicesandfees
Regarding using the USPS and insurance - you can get coverage of up to $50,000 per package through registered-insured mail. A few additional options would be obtaining private insurance, delivering the coin to the grading company at their office or at a coin show or finding an extremely trustworthy dealer to submit the coin for you.
Mark Feld* of Heritage Auctions*Unless otherwise noted, my posts here represent my personal opinions.
3rd party insurance - wasn't the Hope diamond sent registered insured?
Personal delivery and pickup.... Separate insurance.... Private delivery service. Cheers, RickO
Thanks
The site really is a wealth of information thanks to all who have responded.