How to deduct medical expenses? Need Dr tax id?

No you don't need the doctor's tax id. You do need receipts though - they should give you one even if you pay cash.

You can only deduct the portion of your medical expenses that's over 7.5% of your adjusted gross income, and then only if you itemize. You'd show the expenses on schedule A.

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I've never heard of needing the doctor's tax ID. Medical expenses are part of itemized deductions. If you don't have enough qualifying deductions to exceed the standard deduction, itemizing has no benefit.

You don't need the doctor's tax id. You would need some sort of receipt/statement if audited. Medical expenses are an itemized deduction subject to 7.5% of your income. If your total medical expenses don't exceed 7.5% of your income or you do not itemize, there is no tax benefit from this expense.

deduction of unreimbursed medical expenses is a form 1040 schedule A item. this deduction is worthless if you cant come up with enough total schedule a items to do better than the standard deduction, plus, IIRC, medical expenses are not fully deductible; only to the extent that they exceed your AGI by a certain percentage.

you have no need for or right to any tax number info from your physician.

they will issue you some kind of receipt for your cash and you need to collect them all to be able to claim medical deductions

and that is if you can itemize and also only if your medical exceeds 7.5% of your AGI