Network Leakage in Direct Contracting: How to Measure It, What Causes It, and How to Fix It

You spent six to eighteen months negotiating direct contracts with high-value providers. Your per-procedure rates are 20–40% below your carrier's standard network. Then your claims data shows that a third of your employees are still getting services repriced through the commercial network — at full rates.

That's network leakage. And it's one of the most expensive problems self-insured employers face after a direct contracting program launches.

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What Network Leakage Actually Means

In a direct contracting context, leakage happens when a covered member uses a provider you have a direct contract with — or should be using — but the claim routes through your commercial carrier's network instead. The repricing logic defaults to the carrier rate, not your negotiated rate.

It also happens when members bypass your contracted providers entirely and use out-of-network or carrier-network facilities for services your direct contracts were designed to cover.

Either way, you're paying more than you should. A $15,000 knee replacement that should reprice at your direct-contract rate of $11,000 instead hits at the carrier's $18,500 allowed amount. That's a $7,500 per-claim error, and it compounds fast across a population.

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How to Measure Leakage

You need three data sources working together: your claims feed, your direct contract provider roster, and your TPA's repricing logic.

Step 1: Build your contracted provider list

Pull every NPI, TIN, and facility ID covered under your direct contracts. This sounds obvious, but most employers discover their roster has gaps — missing satellite locations, newly credentialed providers, or facilities that changed tax IDs after a system merger.

Step 2: Run a claims crosswalk

For every claim in the past 12 months, match the rendering and billing provider NPI against your contracted roster. Flag any claim where:

• The rendering provider is on your direct contract roster but the claim was repriced at a non-direct-contract rate
• The claim category (DRG, procedure code, specialty) falls within your contracted service lines but was serviced out-of-network

Step 3: Quantify the dollar variance

For flagged claims, calculate the difference between what was paid and what your direct-contract rate would have produced. This is your leakage cost.

A mid-size employer with 2,500 covered lives running a well-designed direct contracting program should see leakage below 8% of in-scope claims volume. Leakage rates above 15% indicate a systemic problem — usually in claims routing, member education, or roster maintenance, not provider access.

Useful benchmark: A 2023 Health Rosetta analysis of self-insured employers found that claims routing errors alone — not member behavior — accounted for 40–60% of measured network leakage in direct contracting programs.

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What Causes Leakage

1. Claims Routing Failures at the TPA

Your TPA's adjudication system needs to be explicitly configured to check your direct contract roster before defaulting to the commercial network. If that logic isn't coded correctly, or if your roster file isn't updated in the system, claims slip through.

This is the most common cause and the most fixable. It requires a data governance process, not a renegotiation.

2. Stale Provider Rosters

Providers change practice groups, billing entities, and NPIs. A surgeon you contracted with last year may now bill under a new group TIN. If your roster doesn't reflect that change, claims from that surgeon reprice as out-of-network even though you have a contract in place.

3. Members Don't Know Who's In-Scope

If your employees don't know which providers are covered under your direct contracts — or why they should care — they default to whoever their PCP refers them to. That PCP is often affiliated with a health system you haven't contracted with.

This is a steerage problem, not a repricing problem, but the financial result is the same.

4. Referral Patterns That Bypass Your Network

Even when members want to use your direct-contract providers, their primary care physicians refer them to specialists or facilities outside your contracted network. Without a closed-loop referral process or navigation support, members follow the referral.

5. Emergency and Urgent Care Defaults

Emergency events naturally bypass steerage. But post-stabilization follow-up care — the physical therapy after the ER visit, the cardiology consult after the hospitalization — frequently stays with the treating facility's affiliated network rather than routing back to your direct-contract providers.

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How to Fix It

Fix Claims Routing First

Pull a sample of 50 flagged leakage claims and trace each one through adjudication. Identify where the routing decision was made and why the direct-contract logic didn't trigger. In most cases, you'll find one of three issues:

• The TPA's system has a hierarchy that puts commercial network repricing above direct contract repricing
• The provider NPI in the claim doesn't match the NPI in your roster file
• The service code falls outside the scope definition in your contract, even though clinically it should be covered

Document the issue category for each claim. Bring that analysis to your TPA account manager with a resolution deadline. This isn't a negotiation — it's a contract performance issue. Most TPAs have SLAs for claims routing accuracy.

Implement Quarterly Roster Reconciliation

Build a process where your direct contracting partners send you updated NPI and TIN data every quarter. Compare it against your TPA's configured roster. Reconcile discrepancies before they generate leakage.

This is a 2–3 hour quarterly task if you have the right data infrastructure. It prevents thousands of dollars in per-claim errors.

Add Member Navigation Support

Navigation services — whether through a third-party navigator or an internal benefits team — directly reduce steerage-related leakage. Members with a phone number to call before scheduling a specialist visit use your direct-contract providers at significantly higher rates.

Quantify this before you budget for it. If your average direct-contract savings per in-scope procedure is $4,200, and navigation support improves in-scope utilization by 10 percentage points across 200 procedures per year, that's $840,000 in recovered savings. Navigation services typically run $3–8 per member per month for a 2,500-life group — well under $250,000 annually.

Build Leakage Reporting Into Your Quarterly Review

Leakage isn't a one-time fix. Set a standing agenda item in your quarterly benefits review to report:

• Total claims volume in direct-contract service lines
• Claims correctly routed to direct-contract repricing (as a percentage)
• Claims routed through commercial network that should have been direct-contract
• Dollar impact of leakage in the quarter
• Root cause breakdown (routing error vs. steerage failure vs. roster gap)

This keeps the issue visible and gives your TPA and navigation vendor clear performance targets.

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What Good Looks Like

A well-run direct contracting program with active leakage management holds leakage below 8% of in-scope claims by volume and below 5% by dollar value within 18 months of launch. The first 6 months are typically messier — expect 15–25% leakage as routing logic gets refined and members learn the network.

The employers who close the gap fastest are the ones who treat leakage as a data problem with a process solution, not a behavior problem that requires culture change. Routing logic and roster hygiene are within your control. Fix those first, measure the result, then invest in the member-facing interventions.

Leakage that isn't measured doesn't get fixed. And leakage that doesn't get fixed quietly cancels out the economics of your direct contracting program.