What Is DEERS? | TRICARE Eligibility Guide (2026) | TRICARE.com

*Note: TRICARE.com is an independent reference site and is not the official TRICARE program or the Defense Health Agency. For official policy and records management, visit TRICARE.mil.*

## Quick answer DEERS (Defense Enrollment Eligibility Reporting System) is the global database that tracks everyone eligible for military benefits, including TRICARE, ID cards, and commissary privileges. You cannot get TRICARE coverage unless your information is current in DEERS; if your DEERS record is outdated, your medical claims will be denied.

## Details DEERS is managed by the Defense Manpower Data Center (DMDC). It serves as the single source of truth for the Department of Defense to verify who is eligible for healthcare.

### Why DEERS Matters for TRICARE Every TRICARE plan—from Prime and Select to Reserve Select and For Life—requires a "Yes" in the DEERS eligibility field. When you visit a doctor, the provider checks your eligibility against this database. If you move, change your marital status, or have a child and fail to update DEERS, your "eligibility flag" may drop, causing TRICARE to bounce your claims.

### Qualifying Life Events (QLEs) In 2026, TRICARE continues to operate on an "enrollment" basis. You can generally only change your coverage during Open Season or after a Qualifying Life Event (QLE). However, the QLE must be recorded in DEERS first. Common QLEs include: * **Marriage or Divorce:** You must show a marriage certificate or divorce decree to a RAPIDS office. * **Birth or Adoption:** You have 90 days (120 days if overseas) to register a child in DEERS. * **Retirement:** Moving from active duty to retired status requires a DEERS update to keep coverage. * **Address Changes:** Use the MilConnect website to update your address immediately so you receive enrollment period notices.

### How to Update DEERS There are four primary ways to keep your record current: 1. **Online:** Visit **milConnect** (DMDC). This is the fastest way to update contact info (address, email, phone). 2. **In Person:** Find a **RAPIDS (Real-Time Automated Personnel Identification System)** office. This is required for adding dependents or getting new ID cards. 3. **By Phone:** Call the DMDC/DEERS Support Office at 1-800-538-9552. 4. **By Mail:** Mail certified copies of documents (like birth certificates) to the DMDC Support Office.

### Verifying Social Security Numbers TRICARE requires Social Security Numbers (SSNs) for all beneficiaries to coordinate benefits. If a dependent’s SSN is missing from DEERS, their TRICARE coverage may be terminated after a grace period.

## Who this affects * **Active Duty Service Members:** Sponsors responsible for enrolling all family members. * **National Guard and Reserve:** Critical for tracking "Line of Duty" care and TAMP eligibility. * **Retirees:** Must ensure DEERS reflects retired status to transition to TRICARE Select or Prime (Retired). * **Family Members:** Spouses and children (up to age 21, or 23 if a full-time student). * **Survivors:** Transitional survivors and surviving spouses must keep records current to maintain benefits.

## Sources * **TRICARE.mil:** [DEERS Overview](https://www.tricare.mil/deers) * **milConnect (DMDC):** [Beneficiary Web Enrollment](https://milconnect.dmdc.osd.mil/) * **Defense Health Agency:** [Eligibility & Enrollment Info](https://health.mil/) * **TriWest Healthcare Alliance (West Region):** [Eligibility Verification](https://www.triwest.com/)