TRICARE Category Guide: Group A vs. Group B explained

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## Quick answer In the TRICARE system, your **Category** (specifically "Beneficiary Category") determines your priority for care, your enrollment options, and your out-of-pocket costs. There are two primary categories: **Group A** (those who entered service before January 1, 2018) and **Group B** (those who entered on or after that date). Within these groups, your status as an Active Duty Service Member (ADSM), active duty family member, or retiree further dictates which plans you can join.

In detail

Your beneficiary category is the foundation of your military health benefits. It is based on your relationship to the uniformed services and when you (or your sponsor) first joined.

### 1. Group A vs. Group B The most significant divider in TRICARE costs is your enrollment group. * **Group A:** You or your sponsor’s initial enlistment or appointment occurred **before January 1, 2018**. * **Group B:** You or your sponsor’s initial enlistment or appointment occurred **on or after January 1, 2018**.

**Why it matters:** Group B beneficiaries typically pay higher enrollment fees and higher catastrophic caps than Group A. For example, in 2026, the TRICARE Select enrollment fee for a Group A retired family is lower than that of a Group B retired family.

### 2. Priority for Care TRICARE categories establish a "pecking order" for getting appointments at Military Treatment Facilities (MTFs): 1. **Priority 1:** Active Duty Service Members (ADSMs). 2. **Priority 2:** Active Duty Family Members (ADFMs) enrolled in TRICARE Prime. 3. **Priority 3:** Retirees and their family members enrolled in TRICARE Prime. 4. **Priority 4:** ADFMs not enrolled in Prime (using TRICARE Select). 5. **Priority 5:** Retirees and family members not enrolled in Prime.

### 3. Category Classifications Beyond Group A and B, you fall into one of these specific beneficiary types: * **Active Duty Service Members (ADSMs):** Includes all branches and activated Reserve/Guard. Must enroll in Prime. $0 out-of-pocket costs. * **Active Duty Family Members (ADFMs):** Spouses and children of ADSMs. Eligible for Prime or Select. * **Retirees and Family Members:** Includes those retired from active duty and "Gray Area" retirees (though Gray Area retirees have different plan options like TRICARE Retired Reserve). * **National Guard/Reserve Members:** Eligible for TRICARE Reserve Select (TRS) while in inactive status. * **Survivors:** Spouses and children of deceased service members. Benefits vary based on the sponsor's status at the time of death. * **Medically Retired:** Those placed on the Permanent Disability Retired List (PDRL) or Temporary Disability Retired List (TDRL).

## Who this applies to * **Active Duty:** Determines mandatory enrollment in TRICARE Prime. * **Retirees:** Determines the specific enrollment fees and copays they must pay annually. * **Reserve Component:** Dictates eligibility for premium-based plans like TRS or TRR. * **Young Adults:** Children ages 21–26 fall into the "TRICARE Young Adult" category, which has separate pricing.

Common scenarios

**Scenario 1: The Group A Veteran** John joined the Army in 2005 and retired in 2025. Because he joined before 2018, he is **Group A**. When he enrolls in TRICARE Select in 2026, his family enrollment fee is roughly $370–$400, and his catastrophic cap is locked at the lower Group A rate.

**Scenario 2: The New Enlistee** Sarah joined the Navy in 2024. She is **Group B**. As an ADSM, her care is free. However, if she remains in the Navy, her future children will be Group B beneficiaries. If she retires in 20 years, her retirement TRICARE costs will be significantly higher than John's (Scenario 1) because of her Group B status.

**Scenario 3: The National Guard Member** Mark is a "drilling" Guardsman. His category is **Selected Reserve**. He is eligible for TRICARE Reserve Select (TRS). He pays a monthly premium (e.g., ~$55 individual / ~$260 family in 2026 rates) regardless of his Group A or B status, as TRS costs are adjusted annually based on program costs, not enlistment dates.

## Related terms * **Sponsor:** The service member (active, retired, or deceased) whose service makes the family eligible. * **DEERS:** The Defense Enrollment Eligibility Reporting System; the database that tracks your beneficiary category. * **Catastrophic Cap:** The maximum out-of-pocket amount you pay for covered services each calendar year. * **T-5 Contract:** The 2025/2026 regional contract transition involving Humana Military (East) and TriWest (West). * **Split Enrollment:** When family members live in different regions or have different TRICARE plans.

## Sources * **TRICARE.mil Beneficiary Categories:** [https://www.tricare.mil/Plans/Eligibility](https://www.tricare.mil/Plans/Eligibility) * **TRICARE Cost Matrix (2026):** [https://www.tricare.mil/costs](https://www.tricare.mil/costs) * **Defense Health Agency (DHA):** [https://health.mil/](https://health.mil/) * **TriWest Healthcare Alliance (West Region):** [https://www.triwest.com/](https://www.triwest.com/)