Can I switch from a Non-OA visa to a Non-O visa in Thailand without leaving the country?

Why dont you want to have a health insurance?

First of all, you need to invalidate your current 1-year extension of stay based on a former Non-O/A visa, before you can apply for any other visa type, like the 90-days Non-Imm-O Retirement Visa.

I have already explained before how to achieve this.

You need a Thai bank account in order to be able to apply for the 90-days Non-Imm-O Retirement Visa inside Thailand

You can apply for the "change of visa type" from out of a 60-days tourist visa or out of the visa-exempt entry, to the initial "90-days Non-Imm-O Retirement Visa", if you already have a Thai bank account with a minimum of 800,000 THB already sitting in it.

You need EITHER

a bank letter confirming that the 800,000 THB are sitting in the account and a proof that the money came from abroad.

OR:

You need a legalized by your embassy in Bangkok income affidavit over a monthly pension or income minimum of 65,000 THB.

In case your embassy does not issue income affidavits any more, you will have to use the 800,000 THB deposit method – at least in the first year.

You need a rental contract and you will need a minimum of 15 days stay permit left on your entry stamp in order to apply.

This application costs a 2000 THB fee, the 90-days visa will be issued for 14 days "under consideration". After 14 days you visit Immigration again and pick up the stamp.

And as soon as the money has seasoned in your bank account for two months, you get the bank letter that confirms it, update your bankbook and withdrawasmall amount at the ATM and keep the receipt.

Then you can apply for the "1-year extended stay permit based on retirement"

(which some people call "retirement visa" but which is NOT a "visa" but a stay permit).

This application costs another 1900 THB fee.

Keep in mind, in order to get any service from Immigration, you need to be properly registered in your accommodation by the TM30 registration system

Open this Immigration website and click onto number 9, it will open a .pdf listing the requirements for the “change of visa type” to the 90-days Non-Imm-O Retirement Visa.

anyone??

Don’t use an Agent just go to immigration and ask them

you can invalidate any 1-year extension based on a former Non-Imm-O/A LongstayVisa, by exiting Thailand withoout a re-entry permit. Only then you are free to apply for a brand new 90-days Non-Imm-O Retirement Visa. Or you wait until the expiry of the current 1-year extension, exit shortly before and after the expiry apply for the 90-days Non-Imm-O outside of Thailand. Another alternative would be, if you already have a Thai bank account and 800,000 THB minimum already sitting in it, you could re-enter visa-exempt, get stamped in for 30 days and immediately apply for the "change of visa type" from the touristic entry to the initial 90-days Non-O visa on Immigration (in this case you must prove that the money came from abroad and you must have a rental contract of a minimum of 3 months, at least on most Immigrations)

Yes just go to Thai visa centre Bangkok . Can be done in couple of days

No it's not. You need to leave Thailand, either as your current extension is ending if you have a re-entry permit, or as you want if you don't. You can go to a nearby country and apply for the 90 day Non-O visa there, return to Thailand and apply for the 12 month extension of stay as normal but as it will be based on the Non-O there will be no insurance requirement