I.R.M.A.A.IncomeRelatedMonthly Adjustment Amount(Applies to Part B + Part D) 2026 A+B Premiums per cms.gov 2026 A+B Premiums per cms.gov request ssa.gov to lower irmaa request ssa.gov to lower irmaa If you have questions specific to your situation, please contact the Social Security Administration 1.800.772.1213,the entity managing Part B, IRMAA Part B and IRMMA Part D premiums on behalf of Centers for Medicare & Medicaid Services. MyMedicareHero is not the government.