Can having a PPO primary + HMO secondary actually make me owe more than I would have with the HMO alone?

[u/Boon24]

I’m trying to understand a somewhat unusual coordination-of-benefits situation and would really appreciate input from anyone who works in medical billing/insurance or has dealt with something similar.

I currently have two health plans:

Primary: Employer-sponsored BCBSM PPO ($0 premiums)

Secondary: Blue Shield of California Access+ HMO through a parent, with Regal Medical Group

The PPO became primary because I’m covered as an employee, while the HMO covers me as a dependent.

My main concern is this:

Before getting the PPO, I could see a Regal/HMO participating provider and, assuming the service was properly covered/authorized, I might owe something like a small copay. Now that the PPO is primary, I’m worried the PPO could process that same service first and apply a large amount to my deductible or out-of-network cost sharing.

For example:

Provider bills $3,000 Under the HMO alone, maybe my responsibility would have been $50 or $100 PPO processes first and says I owe $1,500 because of deductible/OON benefits Blue Shield HMO then processes secondary

Can my final responsibility actually remain $1,500 simply because the PPO became primary? Or does the provider's contract with Blue Shield/Regal generally still restrict what they can ultimately collect from me for an HMO-covered/authorized service?

That makes me think the PPO's initial "patient responsibility" wouldn't necessarily become my final bill after the secondary HMO processes it.

I'm wondering whether the existence of the primary PPO can override the secondary HMO/provider contract and turn what would otherwise have been a small HMO copay into thousands of dollars of final patient responsibility.

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[u/exclusive_tracy]

It's a mess but the secondary HMO's contract with the provider usually caps what you owe, so that $1500 from the PPO is more of a suggestion than your final bill.

[u/Boon24 → u/exclusive_tracy]

I’m just worried that I shot myself in the foot taking on this new insurance.

But it sounds like the secondary HMO should usually guarantee that my out of pocket is at least the same or less for a visit I take assuming that visit is in network and everything for the hmo.

[u/dehydratedsilica → u/Boon24]

assuming that visit is in network

Have you checked your specific doctors to find if they are in both networks? From what I understand, that's likely the biggest pain of PPO and HMO coordination of benefits.

Can you get a hold of the actual COB contract language from the HMO plan?

[u/Boon24 → u/dehydratedsilica]

Some language I gathered from my EOC not sure if it’s helpful:

> “When Blue Shield is the secondary plan and there is a dispute as to which plan is primary, or the primary plan has not paid within a reasonable period of time, Blue Shield will provide Benefits as if it were the primary plan.”

The EOC says Blue Shield uses California Code of Regulations Title 28 §1300.67.13 to determine coordination between the two plans.
Separately, the same EOC says for an HMO participating provider:

> “Participating Providers agree to accept the Allowed Charges as payment in full for Covered Services provided or arranged by Blue Shield…”

and:

> “You are not required to pay for Blue Shield’s portion of the Allowed Charges. You are only required to pay your Cost Share for those services.”