Secondary Insurance & Primary from Same Company: Coverage Rules

Most secondary insurance policies exclude coverage when the primary insurer is the same company (e.g., two plans from Blue Cross Blue Shield).

Why This Exists

• Anti-duplication – Prevents double recovery / profit from same loss.
• Contractual coordination – Same-company plans have internal COB rules; secondary often pays $0 if primary paid per its fee schedule.
• Network alignment – Both plans use same provider contracts; no "out-of-network" gap to fill.

Exceptions / Nuances

• Different legal entities – BCBS of State A (primary) vs. BCBS of State B (secondary) may coordinate differently.
• Different plan types – HMO primary + PPO secondary (same parent) may have carve-outs.
• Medicare + Employer Plan (Same Insurer Admin) – Medicare is primary; employer plan secondary per MSP rules, even if same administrator.
• Supplemental / Indemnity Policies – Hospital indemnity, critical illness, accident plans pay fixed benefits regardless of primary.

Action Steps

1. Read both policies' COB clauses.
2. Call member services for each plan – ask: "If Plan A is primary, does Plan B pay secondary?"
3. Request written confirmation.
4. If denied, appeal with policy language; contact state DOI.

Assumption of coverage is dangerous. Verify COB rules before care.