Your friend will need to contact the SSA directly in an attempt to correct his earnings record. I would contact the local legal aid office to see whether their are attorneys or paralegals who can assist him in doing this since he is in a very unusual situation.
Here is a link to the SSA's website to initiate a record correction:
As for the mold, many types of mold are not dangerous, but the landlord does have a legal obligationn to repair and maintain the property in livable condition. Your friend could contact the health department and local housing inspector to report the issue if the landlord is unwilling to make the necessary repairs, since they typically have the authority to compel necessary repairs.
Your friend would normally be eligible for COBRA benefits through the employer to continue health insurance for up to 18 months if he can afford the premium. That would continue coverage until other insurance becomes available.
They may be eligible for Medicare, but the issue with the SSA will need to resolved first. Or, they may qualify for Medi-cal benefits through the state.
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