Code of Federal Regulations > Title 20 > Chapter III > Part 418 > Subpart B - Subpart B—Medicare Part B Income-Related Monthly Adjustment Amount

U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

INTRODUCTION, GENERAL PROVISIONS, AND DEFINITIONS

§ 418.1001 - What is this subpart about?

§ 418.1005 - Purpose and administration.

§ 418.1010 - Definitions.

DETERMINATION OF THE INCOME-RELATED MONTHLY ADJUSTMENT AMOUNT

§ 418.1101 - What is the income-related monthly adjustment amount?

§ 418.1105 - What is the threshold?

§ 418.1110 - What is the effective date of our initial determination about your income-related monthly adjustment amount?

§ 418.1115 - What are the modified adjusted gross income ranges?

§ 418.1120 - How do we determine your income-related monthly adjustment amount?

§ 418.1125 - How will the income-related monthly adjustment amount affect your total Medicare Part B premium?

§ 418.1130 - [Reserved]

§ 418.1135 - What modified adjusted gross income information will we use to determine your income-related monthly adjustment amount?

§ 418.1140 - What will happen if the modified adjusted gross income information from IRS is different from the modified adjusted gross income information we used to determine your income-related monthly adjustment amount?

§ 418.1145 - How do we determine your income-related monthly adjustment amount if IRS does not provide information about your modified adjusted gross income?

§ 418.1150 - When will we use your amended tax return filed with IRS?

DETERMINATIONS USING A MORE RECENT TAX YEAR'S MODIFIED ADJUSTED GROSS INCOME

§ 418.1201 - When will we determine your income-related monthly adjustment amount based on the modified adjusted gross income information that you provide for a more recent tax year?

§ 418.1205 - What is a major life-changing event?

§ 418.1210 - What is not a major life-changing event?

§ 418.1215 - What is a significant reduction in your income?

§ 418.1220 - What is not a significant reduction in your income?

§ 418.1225 - Which more recent tax year will we use?

§ 418.1230 - What is the effective date of an income-related monthly adjustment amount initial determination that is based on a more recent tax year?

§ 418.1235 - When will we stop using your more recent tax year's modified adjusted gross income to determine your income-related monthly adjustment amount?

§ 418.1240 - Should you notify us if the information you gave us about your modified adjusted gross income for the more recent tax year changes?

§ 418.1245 - What will happen if you notify us that your modified adjusted gross income for the more recent tax year changes?

§ 418.1250 - What evidence will you need to support your request that we use a more recent tax year?

§ 418.1255 - What kind of major life-changing event evidence will you need to support your request for us to use a more recent tax year?

§ 418.1260 - What major life-changing event evidence will we not accept?

§ 418.1265 - What kind of significant modified adjusted gross income reduction evidence will you need to support your request?

§ 418.1270 - What modified adjusted gross income evidence will we not accept?

DETERMINATIONS AND THE ADMINISTRATIVE REVIEW PROCESS

§ 418.1301 - What is an initial determination regarding your income-related monthly adjustment amount?

§ 418.1305 - What is not an initial determination regarding your income-related monthly adjustment amount?

§ 418.1310 - When may you request that we make a new initial determination?

§ 418.1315 - How will we notify you and what information will we provide about our initial determination?

§ 418.1320 - What is the effect of an initial determination?

§ 418.1322 - How will a Medicare prescription drug coverage income-related monthly adjustment amount determination for the effective year affect your Medicare Part B?

§ 418.1325 - When may you request a reconsideration?

§ 418.1330 - Can you request a reconsideration when you believe that the IRS information we used is incorrect?

§ 418.1335 - What should you do if our initial determination is based on modified adjusted gross income information you believe to be incorrect?

§ 418.1340 - What are the rules for our administrative review process?

§ 418.1345 - Is reopening of an initial or reconsidered determination made by us ever appropriate?

§ 418.1350 - What are the rules for review of a reconsidered determination or an administrative law judge decision?

§ 418.1355 - What are the rules for reopening a decision by an administrative law judge of the Office of Medicare Hearings and Appeals (OMHA) or by the Medicare Appeals Council (MAC)?