There are two consideration:
The Bulgarian document you have
by reference to the Free Movement document
https://www.freemovement.org.uk/compreh ... _Insurance
Another way to prove comprehensive sickness insurance includes past coverage under your home country’s social security system. This is a method that can be used in particular by citizens of Bulgaria, Romania and the Netherlands if they were issued certain documents giving them the right to receive healthcare in the UK at the expense of their home country.
It would help if you posted an anonymised version of the translated document you received from the Bulgarian National Revenues Agency so that the exact wording can be seen.
If the Bulgarian document you have is not accepted by the HO as being equivalent to CIS
Refer to the current AN guide:
https://assets.publishing.service.gov.u ... l_2021.pdf
If you did not have CSI, please explain in your application why you did not and whether you were aware you needed to hold it. You can tell us about any additional factors that may help us decide your application at section 7.10 of the form.
If you make out a good case, including for example that you thought the Bulgarian document you are submitting did provide the required medical cover, the HO may grant you naturalisation by discretion.
gbozhanova wrote: ↑Wed Jun 23, 2021 2:39 pm
I received an email from Sopra Steria who checked my documents and said I am missing mandatory documents for CSI proof.
Sopra Steria is a commercial organisation that handles the biometrics and paperwork on behalf of the HO but they are not involved in decision making. I would tell them that the Bulgarian document you are submitting is proof of the medical cover required - let the HO decide