Why does interoperability increase IAM risk in healthcare?

Why This Matters for Security Teams

Interoperability in healthcare is valuable because it enables care coordination, analytics, and faster clinical workflows. It also creates more pathways for non-human identities, service accounts, APIs, and integration tokens to reach protected systems. The risk is not merely volume. It is the loss of clarity over which workload should have access, for how long, and under what conditions. NIST’s NIST Cybersecurity Framework 2.0 emphasizes governance and continuous risk management, which is exactly what interoperable environments tend to strain.

Healthcare teams often inherit this complexity through EHR integrations, lab interfaces, payer connections, and partner data exchange. Each trust relationship can be secure in isolation and still become risky when combined with weak offboarding, broad scopes, or shared secrets. NHIMG research shows why this matters: the Top 10 NHI Issues and the Ultimate Guide to NHIs — Why NHI Security Matters Now both frame non-human access as a governance problem, not just an authentication problem. In practice, many security teams discover the exposure only after an integration keeps working long after it should have been retired.

How It Works in Practice

Interoperability increases IAM risk because every new application connection introduces another identity lifecycle to govern. In healthcare, that often means machine-to-machine access for FHIR APIs, claims exchange, imaging, scheduling, billing, and third-party care coordination tools. If those identities are granted broad RBAC roles, static secrets, or overly durable tokens, the access can outlive the business need that created it. Current guidance suggests treating these as workload identities with explicit ownership, scope, and expiry, rather than as shared technical conveniences.

Practitioners should think in terms of four controls:

• narrow the audience and scope of each integration token;
• use JIT credential issuance where the workflow can support it;
• bind access to workload identity, not just a stored secret;
• monitor usage continuously so dormant integrations do not become hidden entry points.

This is where NHI-specific guidance becomes useful. The OWASP NHI Top 10 highlights exposure patterns such as excessive privilege and poor secret governance, while Ultimate Guide to NHIs — Key Challenges and Risks connects those patterns to real operational failures. The NIST Cybersecurity Framework 2.0 also reinforces inventory, access review, and resilience as continuous functions rather than one-time projects. These controls tend to break down when multiple vendors share the same integration pattern across hybrid systems because ownership, revocation, and logging become fragmented across teams and platforms.

Common Variations and Edge Cases

Tighter access control often increases operational overhead, requiring organisations to balance safer interoperability against faster deployment and easier partner onboarding. That tradeoff is most visible in emergency care, legacy HL7 interfaces, and multi-vendor platforms where a brittle integration can affect clinical operations. There is no universal standard for this yet, but best practice is evolving toward short-lived credentials, explicit trust boundaries, and more frequent entitlement review.

One common edge case is the shared service account created for convenience across multiple interfaces. It may keep the workflow running, but it also hides attribution and makes offboarding difficult. Another is vendor-managed integration, where the healthcare organisation assumes the vendor is handling identity hygiene. That assumption is dangerous if secrets are reused, rotations are manual, or access is not tightly scoped. The Azure Key Vault privilege escalation exposure example shows how secrets governance can become an escalation path when permissions are too broad. For AI-enabled interoperability, the same concern extends to autonomous workflows that can chain tools and amplify access beyond the original intent.

In practice, healthcare interoperability is safest when every connection has a named owner, a defined expiry, and a documented reason to exist. Without that discipline, integrations tend to accumulate access faster than they are retired.

Related resources from NHI Mgmt Group

• Why do Salesforce integrations increase NHI risk?
• Why do unmanaged endpoints increase NHI risk?
• Why do non-human identities create more audit risk than human accounts?
• Why do non-human identities create audit risk in modern environments?