TRICARE Stepchild Eligibility & Rules (2026 Guide) | TRICARE.com

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## Quick answer Stepchildren are eligible for TRICARE coverage as long as they are the legal dependents of an eligible service member or retiree through a valid marriage. Coverage typically continues until age 21 (or 23 if a full-time student), but will end immediately if the service member and the child's parent divorce, unless the stepchild is legally adopted.

Details

### Eligibility Requirements To qualify for TRICARE, a stepchild must be unmarried and fall into one of the following categories: * **Under age 21.** * **A full-time student aged 21–23:** Must be enrolled in an accredited college and be at least 50% dependent on the sponsor for financial support. * **Incapacitated child:** Over age 21 with a disability that occurred before age 21 (or age 23 if a student).

### The DEERS Requirement The sponsor must register the stepchild in the **Defense Enrollment Eligibility Reporting System (DEERS)**. You will need to provide the child's birth certificate, social security card, and the marriage certificate linking the sponsor to the child's legal parent.

### Impact of Divorce on Coverage This is the most critical "edge case" for stepchildren. If the sponsor and the child’s biological parent divorce: * **Coverage Ends:** The stepchild’s eligibility for TRICARE ends at 12:01 a.m. on the day the divorce decree is final. * **The Exception:** If the sponsor **legally adopts** the stepchild before the divorce is finalized, the child remains eligible for TRICARE as an adopted child, regardless of the marital status of the parents.

### Costs and Plans Stepchildren have access to the same plans as biological children based on the sponsor’s status: * **Active Duty Families:** Typically enrolled in TRICARE Prime (no out-of-pocket costs) or TRICARE Select (2026 rates apply for deductibles and copays). * **Retiree Families:** May use TRICARE Prime (enrollment fees apply) or TRICARE Select. For Group A retirees in 2026, the TRICARE Select enrollment fee is approximately $195/individual or $390/family annually. * **TRICARE Young Adult:** If the stepchild reaches age 21 (or 23) and is not married or eligible for their own employer-sponsored plan, they may purchase TRICARE Young Adult coverage up to age 26.

### TRICARE Regions as of 2026 Coverage is managed regionally: * **East Region:** Managed by Humana Military. * **West Region:** Managed by TriWest Healthcare Alliance (as of the T-5 contract transition).

## Who this affects * **Active Duty Service Members:** Stepparents serving in the Army, Navy, Air Force, Marine Corps, Space Force, and Coast Guard. * **Retirees:** Retired military members with stepchildren. * **National Guard and Reserve:** If the sponsor is on active duty orders for more than 30 days or is enrolled in TRICARE Reserve Select (TRS). * **Survivors:** Stepchildren of a deceased sponsor may remain eligible as long as the marriage was valid at the time of death and the child remains unmarried.

## Sources * **TRICARE.mil:** Eligibility for Children [https://www.tricare.mil/Eligibility/WhoIsEligible/Children] * **Defense Manpower Data Center (DEERS):** [https://idco.dmdc.osd.mil/idco/] * **Humana Military (East Contractor):** [https://www.humanamilitary.com/] * **TriWest Healthcare Alliance (West Contractor):** [https://www.triwest.com/]