Medicare and Employer Coverage
Coordinate Medicare with active-employment coverage using employer size and coverage status.
Current job coverage is the controlling fact
At 65 or older, whether group insurance comes from your or your spouse’s current employment changes the Part B timing analysis. For a nontribal employer with 20 or more employees, the group plan generally pays first and Medicare second; for fewer than 20, Medicare generally pays first. Different coordination rules can apply under disability or ESRD. Ask the plan administrator for the written payer order.
Official source: Medicare: Who pays first ↗ · Medicare: Working past 65 ↗
COBRA and retiree coverage differ
COBRA can continue an employer plan after work ends, but it is not qualifying current-employment coverage for the ordinary Part B Special Enrollment Period. That period generally lasts eight months after employment or group coverage ends, whichever occurs first, regardless of whether COBRA continues. Retiree benefits may expect Medicare to pay first. Confirm the actual termination and Medicare dates before relying on either arrangement.
Official source: Medicare: COBRA coverage ↗ · Medicare: When coverage starts ↗ · Medicare: Who pays first ↗
Prescription coverage needs its own notice
The employer can tell you whether its drug benefit is creditable for Part D. Retain the dated creditable-coverage notice; a gap of 63 or more consecutive days without Part D or other creditable drug coverage can lead to a later Part D penalty. Medical payer order and prescription creditability are separate questions; a group medical ID card is not proof of creditability.
Official source: Medicare: Creditable drug coverage ↗ · Medicare: Who pays first ↗
HSA contributions can be affected
Medicare warns that Medicare enrollment, including Part A, can affect HSA eligibility. For someone who applies after 65, Part A can be retroactive by up to six months but no earlier than eligibility. Calculate the last permissible contribution month from the effective date and seek qualified tax advice before making or retaining contributions. This requires personal tax facts beyond a general Medicare page.
Official source: Medicare: Working past 65 ↗ · SSA: When to sign up ↗
Document the transition
Before retirement, record each policy’s last day, whether coverage is based on current work, employer size, payer order and the Part D creditable notice. Apply through SSA when appropriate and verify the Part B effective date; then price any private plan for the new coverage year. Changes to an employer policy can affect family members, so check their options with the administrator before terminating it.
Official source: Medicare: Working past 65 ↗ · Medicare: Who pays first ↗ · SSA: Sign up for Medicare ↗