Vendor EHR support only from OEM network
AC-2(11) blocks vendor accounts from random coffee-shop IPs; sessions allowed only from documented OEM jump ranges during ticket windows.
Usage Conditions
High Risk
Moderate
Medium Cost
AC-2(11) enhances base AC-2 by enforcing usage conditions for accounts — circumstances under which the account can be used (e.g., day/time, location, device compliance, network zone). Base AC-2 decides who has an account; this enhancement constrains when/where/how that account may operate against ePHI systems.
Control Objective
Bind ePHI-capable accounts to organization-defined usage conditions so access outside approved circumstances is denied by policy enforcement.
Implementation Guidance
- Define usage conditions by role: clinical floor vs remote coder vs vendor vs privileged admin.
- Enforce via IdP conditional access, VPN profiles, EHR IP allowlists, and device compliance (MDM).
- Examples: vendors only from named support IPs; privileged admins only from PAW; students only during term hours; remote access blocked from high-risk countries.
- Document medical staff remote charting conditions (MFA + compliant device + approved apps).
- Avoid conditions that block emergency care — pair with break-glass paths (AC-2(2)).
- Monitor blocked attempts for misconfiguration vs malice.
- Review conditions when opening new clinics or telehealth programs.
- Keep condition sets understandable for helpdesk troubleshooting.
Real-World Use Cases
How this control shows up in healthcare and HIPAA-covered environments.
Student accounts nights-only block
Nursing student accounts cannot access EHR after 22:00 or from off-campus IPs unless a clinical instructor overrides for night rotation.
Privileged admin geo/device lock
Cloud tenant admin accounts require compliant PAW + MFA and deny legacy protocols — usage conditions beyond merely 'having' the account.
Best Practices
- Express conditions in IdP policy objects.
- Risk-tier conditions; do not over-constrain bedside care.
- Maintain break-glass that still audits heavily.
- Log and tune false positives with clinical input.
- Revisit after telehealth expansion.
- Align with AC-17 remote access controls.
Common Gaps & Violations
- Conditional access for email only; EHR excluded.
- Vendor accounts usable from anywhere anytime.
- Conditions so strict staff share workarounds.
- No emergency override path.
- Device compliance not checked for BYOD charting.
Required Documentation
- Account usage conditions standard (AC-2(11))
- Condition matrix by account/role class
- IdP/EHR/VPN enforcement configs
- Break-glass override procedure
- Review records after org/network changes
How to Test & Validate
- Attempt access outside allowed time/location with a test account — expect deny.
- Verify compliant path still succeeds for care delivery roles.
- Test vendor IP restrictions.
- Confirm break-glass override works and logs.
- Sample CA policies for ePHI apps in scope.
Audit Considerations
Show conditional access policies that specifically protect ePHI apps, not only Office 365. Walk through a denied vendor attempt log.
HIPAA Mapping
How this NIST control supports HIPAA Security Rule expectations.
- 164.312(a)(1) Access Control — technical policies limiting access circumstances.
- 164.312(d) Person or Entity Authentication — conditions often include stronger auth contexts.
- 164.308(a)(4) Information Access Management — access appropriate to role and context.
- 164.306(a) Security standards — ensure CIA of ePHI including against misuse from unexpected locations.
Compliance Tips
- Put EHR and VPN in the same conditional access framework as email.
- Use named locations for clinics and OEM support nets.
- Document clinical emergency exceptions clearly.
Frequently Asked Questions
Is MFA alone an AC-2(11) usage condition?
MFA is necessary but not sufficient. Usage conditions also include time, place, device, and network constraints on when the account may be used.
Will this hinder ED care?
Design conditions for clinical roles carefully; prioritize vendor/privileged/remote accounts for strictest rules and keep emergency access paths.
How related to AC-17?
AC-17 governs remote access methods; AC-2(11) attaches usage conditions to the accounts themselves across access paths.
References & Resources
- NIST SP 800-53 Rev. 5 — AC-2(11)
- Related controls: AC-2, AC-17, IA-2, IA-8, SI-4
Related Guidelines
Related controls that commonly accompany AC-2(11).
Need Help Implementing AC-2(11)?
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