Social Security cards and info
Report the death to the Social Security Administration; use certified death certificates for claims and agencies
Some steps differ by region inside the country.
Where
Their wallet, files, tax returns, W-2s, and Medicare card. The Social Security Administration can confirm the number to an authorized representative.
How
Look on last year's tax return, a W-2, or a 1099, all of which carry the number.
Check their wallet, safe, and file for the card itself.
Do not apply for a replacement card after death, you only need the number, not the card.
Record the number securely in the estate file, since almost every task requires it.
What to bring
A certified copy of the death certificate
Letters testamentary
This is practical information, not legal, medical, or financial advice.