Ask a health plan how it chose its core software and the answer usually involves a feature comparison: this system supported that benefit configuration, that one had a better provider portal, another handled a particular reporting requirement. The grid felt thorough. It also measured the wrong thing. The failures that actually cost health plans money and member trust rarely come from a missing feature. They come from systems that cannot agree on who the member is, what they are covered for, and whether the provider is in network, at the exact moment a claim is being decided.
That is why health insurance software should be evaluated first on interoperability, not features. A wrong denial that infuriates a member and draws a regulator's attention is usually not a flaw in the adjudication logic. It is the result of the eligibility system, the benefits system, and the provider directory holding three different versions of the truth, none reconciled in time. The feature list did not cause that, and no feature will fix it. Real-time, accurate data exchange between systems is the capability that determines whether a health plan pays the right amount to the right provider for the right member, and it is the one a checklist never captures.
The scale of the problem is documented. KFF found that Medicare Advantage insurers made roughly 53 million prior authorization determinations in 2024 and denied 4.1 million in full or in part. Only 11.5% of denied requests were appealed, but 80.7% of those appeals were partially or fully overturned. The figures highlight the operational cost and member impact of getting prior authorization decisions wrong or delaying them, although they do not establish interoperability as the cause of those denials.
A denial that gets reversed on appeal was usually wrong to begin with, and wrong denials at that volume are expensive to process, damaging to members, and corrosive to trust. Many of them trace not to deliberate decisions but to systems that could not assemble a correct, current picture of the member's coverage when it mattered.
Why Health Insurance Software Is Won on Interoperability
A health insurance claim is an interoperability problem wearing the costume of an adjudication decision. To pay a claim correctly, the system must know the member's current eligibility, their specific benefits and cost-sharing, the provider's network status and contract terms, any prior authorization on file, and how the claim coordinates with other coverage. Each of these typically lives in a different system, and the claim can only be decided correctly if all of them agree. When they do not, the plan denies a valid claim, pays an invalid one, or applies the wrong cost-sharing, and the member and provider absorb the confusion.
The everyday failures follow directly. A member is denied because the eligibility system had not yet processed their enrollment. A provider is paid out of network because the directory was stale. A prior authorization on file in one system is invisible to the adjudication system, so an approved service is denied anyway. None of these is a defect in any single system's features. Each is a failure of the systems to exchange accurate data in time. The plans that suffer most are not the ones with the weakest features; they are the ones whose systems are most siloed.
This is a familiar pattern across insurance. The same principle that governs claim management in life insurance, where a claim can only be paid correctly if policy, beneficiary, and status data agree, governs health claims with even higher frequency and complexity. Health plans process enormous volumes of claims that each depend on multiple systems agreeing, which makes interoperability not one requirement among many but the foundation the whole operation stands on.
The complexity of the data exchange is what makes it hard, and what makes a strong feature list so misleading as a proxy for quality. Health coverage involves layered benefit designs, tiered networks, coordination of benefits across multiple payers, and constantly changing eligibility as members enroll, disenroll, and change plans. Every one of those moving parts has to be reflected accurately, in the right system, at the moment of adjudication.
A plan can own the most feature-rich adjudication engine on the market and still deny valid claims all day if its eligibility feed lags by twenty-four hours. The engine is not the problem. The freshness and consistency of the data flowing into it is, and that is an interoperability property, not a feature.
Provider data illustrates the point vividly. Provider directories are notoriously difficult to keep current, and an out-of-date directory produces a cascade of downstream errors: members steered to providers no longer in network, claims paid at the wrong benefit level, and directories that draw regulatory penalties for inaccuracy. Addressing this requires provider data to be kept accurate and synchronized across the systems that rely on it, with standardized interfaces reducing the risk of inconsistent information propagating between systems. That is interoperability doing the work no feature can do alone.
Regulation Is Making Interoperability a Core Requirement
For years, health plans could treat interoperability as optional, a nice-to-have deferred behind more visible features. That option is gone. The CMS Interoperability and Prior Authorization Final Rule now requires health plans to implement standardized, FHIR-based application programming interfaces for exchanging data with patients, providers, and other payers, and to support electronic prior authorization. The CMS final rule mandates Patient Access, Provider Access, Payer-to-Payer, and Prior Authorization APIs, turning data exchange from a competitive choice into a compliance requirement with deadlines.
The regulation reframes the software decision entirely. A health plan can no longer choose a system on features alone and treat interoperability as something to solve later, because the law now requires standardized data exchange as a baseline. Systems that cannot exchange data cleanly are not merely behind on capability; they are on a path to non-compliance. The plans that already prioritized interoperability are positioned to meet these requirements as a natural extension of how they operate. The plans that treated it as an afterthought face a scramble to bolt standardized exchange onto architectures that were never designed for it.
The rule also signals the direction of travel. Electronic prior authorization, timely and standardized data exchange, and member access to their own data are becoming the expected standard, not the leading edge. A health plan choosing software today is choosing for a regulatory environment that will keep raising the interoperability bar, and a system built around closed, proprietary data will keep falling further behind it.
One upside gets obscured by the compliance framing. The same standardized data exchange that satisfies the regulator also makes the plan work better on every other dimension. When eligibility, benefits, and provider data flow cleanly in real time, prior authorizations resolve faster, claims pay correctly the first time, and members and providers get straight answers instead of contradictions. Interoperability built to meet a mandate delivers operational benefits far beyond the mandate itself. The plans that see it only as a compliance cost will do the minimum and capture little; the plans that see it as an operating advantage will build it well and capture a great deal. The regulation, in effect, is pushing the industry toward an architecture it should have adopted for its own reasons anyway.
What the Best Health Insurance Software Companies Do Differently
The vendors and plans getting this right share a common orientation: they build around data exchange first and features second. The differences that matter are architectural, and they show up in a few concrete commitments:
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Standards-based interfaces: FHIR and other industry standards as the native way the system exchanges data, not a translation layer bolted on to satisfy a mandate.
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Real-time exchange: eligibility, benefits, provider, and authorization data available to adjudication as it is needed, rather than through overnight batch files that have already gone stale.
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Consistent member data: systems should have access to authoritative, synchronized member information so that eligibility, benefits, claims, and other workflows operate on consistent data.
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Open integration: documented APIs that let the plan connect providers, partners, and new capabilities without custom, fragile point-to-point wiring.
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Interoperability by design: data exchange treated as a core requirement from the architecture up, not a feature added under regulatory pressure.
The best health insurance software companies understand that these properties, not the length of a feature list, determine whether a plan pays claims correctly, satisfies its members, and meets its regulatory obligations. Features built on a foundation that cannot exchange data reliably are features that will produce wrong answers quickly. Interoperability first, features second, is the order that actually works.
The Cost of Choosing on Features Alone
A plan that selects software on features and neglects interoperability pays for the mistake continuously. Wrong denials generate appeals, and appeals are expensive to process and damaging to relationships with members and providers. KFF's analysis of ACA marketplace claims has repeatedly found high denial rates and strikingly low appeal rates, which means most wrong denials are never challenged and simply stand as harm to members and eroded trust. Incorrect payments leak money the plan never recovers. And the administrative cost of reconciling systems that disagree consumes staff time on work that correct data exchange would eliminate entirely.
The member experience carries the heaviest cost. A member denied care because two systems disagreed does not see an interoperability failure; they see a health plan that does not work, at a moment when they are unwell and vulnerable. That experience drives complaints, regulatory attention, and attrition, and it is entirely avoidable with software built to keep the member record consistent across systems.
Health plans will keep buying software, and the temptation to choose on the visible strength of a feature grid will remain strong. But the plans that win are the ones that recognize interoperability as the real differentiator, the capability that decides whether claims are paid correctly, members are served well, and regulatory requirements are met. The plans that build on interoperable health insurance software can reduce reconciliation work, improve operational efficiency, and adapt more readily to new interoperability requirements. Partners increasingly lead health plan modernization with data exchange rather than feature breadth, because that is where the outcomes are actually decided. The question a health plan should ask about any Health Insurance Software is not how many features it lists, but whether its systems will agree on the member record the moment a claim is adjudicated.