Should I appeal IRMAA or request a new initial determination?

Use reconsideration to challenge the decision

Reconsideration is the first administrative appeal of an IRMAA initial determination. It is generally appropriate when you believe Social Security applied the rules incorrectly, used the wrong filing status despite the information available, made another factual or procedural error, or should reach a different decision on the existing record.

The normal deadline is 60 days after receipt of the notice. Social Security generally presumes receipt five days after the notice date.

Use a new initial determination for specified new information

Federal IRMAA rules allow a new initial determination in specified circumstances. Common examples include:

A qualifying major life-changing event caused a significant reduction in modified adjusted gross income.
You filed an amended federal income tax return for the tax year Social Security used.
IRS corrected the tax information it sent and you have documentation of the correction.
Social Security used information from three years before the premium year and you can provide the filed return from two years before that year, subject to the regulatory time limits.

The life-changing-event route commonly uses Form SSA-44. It is not the same as reconsideration.

Incorrect IRS information has a special rule

If the only claim is that IRS sent incorrect information, 20 CFR 418.1330 says Social Security will dismiss the reconsideration and direct you to obtain proof of correction from IRS and request a new initial determination. An amended return or IRS correction therefore usually belongs in the new-determination process.

When the facts could support both routes

Do not assume that one request automatically protects the deadline for the other. Read the IRMAA notice and contact Social Security promptly. If the 60-day reconsideration period is approaching, preserve proof of every submission and ask Social Security which request it is treating as filed.

What happens after reconsideration

If Social Security affirms the IRMAA determination, the notice generally provides a right to request a hearing before an administrative law judge in the Office of Medicare Hearings and Appeals. Further review can proceed to the Medicare Appeals Council and potentially federal court.