A single case agreement is a one-time contract between a health plan and a provider who is not in that plan's network, covering a single patient. For the length of that agreement, the payer treats the provider as if they were in network. The claim gets paid at a negotiated rate instead of being denied or dumped on the patient as an out-of-network balance.
For a billing team, the agreement is only half the job. The other half is making sure the claim that follows actually reflects what was negotiated.
What Is a Single Case Agreement, and Why Do Payers Grant Them?
Health plans are expected to maintain networks with enough providers to cover the services they sell. That expectation has a name, network adequacy, and it is why single case agreements exist at all. When a plan's network cannot meet a patient's need, the agreement becomes the release valve.
In practice, payers approve these in a handful of recurring situations:
- No in-network provider is within a reasonable distance.
- The specialty or specific treatment the patient needs is not available in network.
- The patient is mid-treatment and changing providers would create clinical risk.
- Continuity of care after a change in insurance.
Behavioral health is where these come up most often, simply because network gaps in that space are common. Highly specialized care tends to follow the same pattern.
One nuance worth knowing: a single case agreement in insurance is not always the same thing as a gap exception, even though the terms get used interchangeably. A gap exception generally applies when the network has no one qualified at all. A single case agreement is what you pursue when in-network providers technically exist, but none offer the right specialty, proximity, or continuity for that patient.
It also helps to know where the mechanism does not apply. Traditional Medicare has no network in the usual sense, so any provider who accepts Medicare can see the patient. Medicare Advantage does have defined networks, which means these agreements do come into play there, though approvals tend to be harder to secure than with commercial plans.
Where These Agreements Get Caught, or Missed
The agreement has to be in place before care is delivered, which makes this a front-end problem. If eligibility verification flags that the patient is out of network and someone acts on it, you have time to negotiate. If nobody catches it, the patient gets treated and the balance ends up in limbo, with no contract behind it and no clean way to collect.
That is the part practices tend to underestimate. Everything downstream depends on someone noticing the coverage gap early enough to do something about it.
How a Single Case Agreement Gets Billed
Once the agreement is signed, it governs the claim. The terms usually spell out the negotiated rate, the authorized services, the number of visits, and the date range the agreement covers. Bill outside any of those and the claim runs into trouble.
Three things decide whether you get paid correctly:
Bill within the agreed scope. Services outside what was authorized, or delivered after the end date, are not covered by the agreement. Extensions have to be negotiated before the window closes, not after.
Reference the agreement on the claim. Payers typically require the authorization or agreement number so their system prices the claim against the negotiated terms rather than standard out-of-network rules. A claim submitted without it looks like any other out-of-network claim, and gets processed like one.
Check what actually paid. This is the step that gets skipped. Payers sometimes process these claims at their standard out-of-network rate instead of the negotiated one, and the underpayment is easy to miss unless someone compares the remittance against the agreement. If your team is not reconciling payments line by line, you are unlikely to catch it.
Because these claims sit outside your normal workflow, they also age differently. They do not fit neatly into routine follow-up queues, so they need someone who knows the account exists and keeps working it until it closes.
Getting the Process Right
None of this is complicated, but it does require ownership. Someone has to catch the coverage gap during verification, track what was agreed, bill to those terms, and verify the payment matches. When that ownership is unclear, the agreement gets signed and then quietly mishandled at the claim stage, which defeats the point of negotiating it.
Single case agreements sit in the same family as other provider and payer arrangements, including the letters of agreement that shape broader partnerships. What they share is that the paperwork only protects your revenue if the billing follows it precisely.
If out-of-network cases are creating gaps in your revenue cycle, our team can help you handle them properly, from verification through final payment. Get in touch with Vinali RCM and we will take a look at your process.
