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SI-4(19) System and Information Integrity

Risk for Individuals

High Risk Complex High Cost

SI-4(19) (Risk for Individuals) enhances base SI-4 within the NIST System and Information Integrity family. Base SI-4 sets the foundational expectation; this enhancement adds specificity: Implement [organization-defined] of individuals who have been identified by [organization-defined] as posing an increased level of risk. Indications of increased risk from individuals can be obtained from different sources, including personnel records, intelligence agencies, law . Covered entities and business associates apply it to patching, malware defense, monitoring, and integrity verification for EHR, PACS, interfaces, and clinical endpoints.

Control Objective

Implement Risk for Individuals so organization-defined system and information integrity safeguards operate consistently on systems and networks that handle ePHI, with measurable evidence for HIPAA and NIST assessments.

Implementation Guidance

  1. Map SI-4(19) to systems in scope (EHR, imaging, lab, pharmacy, billing, identity, backups, and BA connections).\n2. Translate “Risk for Individuals” into technical settings, procedures, or architecture patterns owned by named roles.\n3. Prefer enforceable controls (config, automation, mediation) over awareness-only measures where feasible.\n4. Integrate with change, incident, and downtime processes so clinical operations are not surprised.\n5. Log and retain evidence of operation (tickets, configs, test results) aligned to audit needs.\n6. Include vendors/BAs in contracts and connection standards when they touch the control surface.\n7. Test after major EHR, network, or cloud changes — upgrades often reset protections.\n8. Review exceptions at least quarterly; expire “temporary” holes that expose ePHI paths.

Real-World Use Cases

How this control shows up in healthcare and HIPAA-covered environments.

Real-world scenario

After-hours bulk CCD pull (SI-4(19))\nNear-real-time SIEM analysis alerts on unusual outbound CCD volume from a billing workstation. Evidence labeled for SI-4(19).\n\n### Encrypted tunnel visibility (SI-4(19))\nTLS inspection or metadata analytics spots covert exfil inside VPN traffic from a compromised coder laptop. Evidence labeled for SI-4(19).\n\n### IoC from HHS/HC3 feed (SI-4(19))\nIndicators of compromise for a healthcare ransomware affiliate are loaded into host and network detections the same day. Evidence labeled for SI-4(19).

Best Practices

  • Name an owner for SI-4(19) in the SSP control matrix.\n- Favor system enforcement on ePHI paths over informal email approval.\n- Measure coverage: percent of in-scope clinical systems where the enhancement operates.\n- Review exceptions quarterly with security and clinical informatics.\n- Feed relevant events to SIEM with a named use case.\n- Keep a one-page evidence pack (config + sample log + last test) ready for assessors.

Common Gaps & Violations

  • Policy cites SI-4(19) but production EHR/network paths show no enforcement of risk for individuals.\n- Permanent exceptions with no expiry for vendors or “special” clinics.\n- Control implemented only on corporate IT — clinical devices and interfaces omitted.\n- No logs or test records; reliance on tribal knowledge.\n- Major upgrade silently disabled the enhancement.

Required Documentation

  • Procedure/standard for Risk for Individuals (SI-4(19))\n- Architecture or configuration baselines showing enforcement points\n- Exception register with owners and expiry\n- Sample logs, alerts, or test results\n- Training or runbook references for clinical/IT operators

How to Test & Validate

  1. Attempt a prohibited or out-of-policy action related to risk for individuals; confirm block, alert, or required workflow.\n2. Complete an authorized clinical/IT path; confirm success and logging.\n3. Sample open exceptions for approval and expiry.\n4. Verify at least one EHR-adjacent and one BA/vendor path are in scope.\n5. Confirm evidence retained for the last 90 days (or per policy).

Audit Considerations

Assessors look for operating evidence of Risk for Individuals on systems touching ePHI — configs, logs, restore/DR artifacts, or failed-test results — not only a policy paragraph referencing SI-4(19).

HIPAA Mapping

How this NIST control supports HIPAA Security Rule expectations.

  • 164.308(a)(5)(ii)(B) Protection from Malicious Software — guard ePHI systems against malware.\n- 164.312(c)(1) Integrity — protect ePHI from improper alteration or destruction.\n- 164.312(b) Audit Controls — mechanisms that record and examine activity in systems with ePHI.\n- 164.308(a)(1)(ii)(B) Risk Management — integrity monitoring reduces residual risk to ePHI.

Compliance Tips

  • List SI-4(19) explicitly in the system security plan with system inventory references.\n- Prioritize emergency department, inpatient EHR, and remote access paths first.\n- Bundle evidence with related HIPAA evaluation, integrity, or workforce-security narratives where they overlap.

References & Resources

  • NIST SP 800-53 Rev. 5 — SI-4(19)\n- Related controls: SI-4

Related Guidelines

Related controls that commonly accompany SI-4(19).

SI-4 High

Information System Monitoring

SI-4 requires monitoring the system to detect attacks and indicators of potential attacks, unauthorized local/network/remote connections…
SI-1 High

System and Information Integrity Policy and Procedures

SI-1 requires system and information integrity policy and procedures addressing purpose, scope, roles, management commitment, coordination…
SI-10 High

Information Input Validation

SI-10 requires checking the validity of information inputs. In healthcare, unvalidated HL7/FHIR messages, portal form fields, and device…

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