Medicare AEP Direct Mail: The Complete Timing Guide for Insurance Agents

For insurance agents selling Medicare Advantage and Part D plans, the Annual Enrollment Period (AEP) is the most important marketing window of the year. AEP runs October 15 through December 7 — 53 days in which millions of Medicare beneficiaries can switch plans, add coverage, or drop Medicare Advantage and return to Original Medicare. Direct mail is the most effective single channel for reaching Medicare-eligible beneficiaries, who skew older (65+), have above-average mail response rates, and often have limited engagement with digital advertising.

For complete AEP/OEP resources, CMS compliance guides, and production calendars, visit insuranceagencymailings.com — Dimaco's dedicated insurance agency direct mail resource.

AEP Direct Mail Production Calendar

Early September — Artwork Finalization. CMS plan benefit information for the coming year is typically finalized in late August to early September. Once your plan benefits are confirmed, finalize your mail piece artwork. AEP mail cannot promote specific plan benefits that haven't been approved — so don't begin designing until you have your approved benefit information in hand.

Mid-September — Production and Mailing List Prep. Submit finalized artwork to Dimaco for production. Simultaneously, pull and NCOA-process your prospecting list. For Medicare marketing, your list should target households with at least one member aged 64+ (to capture the pre-Medicare eligibility window) through 80, in your licensed service area. NCOA-processing a Medicare prospect list is non-negotiable — the 65+ demographic moves at similar rates to the general population, and an undeliverable piece to a prospect you paid $0.15 per record for is pure waste.

Late September — First Drop Mailing. Your first piece should arrive in mailboxes no earlier than October 1 (the start of the CMS marketing window) and no later than October 7 to capture the high-engagement early AEP window. Many agents report their highest response rates on pieces arriving in the first two weeks of October, when beneficiaries are actively evaluating their options and have not yet been saturated by competitor mailings.

Mid-October — Second Drop. A follow-up piece to non-respondents from the first drop — typically a different format (letter vs. postcard, or vice versa) — maintains your presence as the AEP decision window extends. This is also an effective window to mail existing clients their plan confirmation and any benefit updates for the coming year.

Late November / Early December — Urgency Drop. A final urgency piece — emphasizing that December 7 is the last day to make changes — arriving approximately December 1–3 captures late deciders who respond to deadline urgency. Keep this piece simple and call-to-action focused. Response rates on urgency drops for agents with established brand presence consistently exceed mid-AEP response rates.

OEP Planning: January Through March

Open Enrollment Period runs January 1 through March 31. OEP is a smaller opportunity than AEP — only beneficiaries already enrolled in Medicare Advantage can use OEP to switch plans or return to Original Medicare. OEP cannot be used to switch between Part D plans or to enroll in Medicare Advantage for the first time.

OEP mail strategy is different from AEP: rather than broad prospecting, OEP is most effective as a targeted outreach to beneficiaries who made plan changes during AEP (and may have chosen a competitor's plan) or who expressed interest during AEP but didn't convert. A January/February direct mail piece positioned as "Still have questions about your 2026 coverage?" captures this segment effectively.

CMS Compliance Basics for Medicare Mail

CMS (Centers for Medicare & Medicaid Services) regulates marketing communications by agents selling Medicare Advantage and Part D plans. Key restrictions that affect direct mail include: no plan-specific marketing before October 1; no use of the Medicare star rating system without specific CMS-approved language; no claims of "free" benefits without CMS-approved benefit language; no government logos or seals without authorization; and no unsolicited marketing to beneficiaries who have opted out through the DNCL (Do Not Contact List).

Dimaco reviews Medicare mail pieces for obvious CMS compliance red flags — missing required disclosures, prohibited language patterns, and formatting issues. However, CMS compliance responsibility rests with the licensed agent and their FMO. We recommend every Medicare mail piece be reviewed by a CMS-knowledgeable compliance professional before final production approval.