Documented downtime only
Actions without identification allowed only for documented EHR downtime read boards — not routine charting.
Necessary Use Only
High Risk
Moderate
Low Cost
AC-14(2) enhances AC-14 by focusing on necessary use only. Permit actions without identification/authentication only when necessary (e.g., limited downtime read boards) and document prohibition otherwise. Covered entities and business associates should implement this with clear ownership, technical enforcement where feasible, and audit evidence aligned to HIPAA Security Rule expectations.
Control Objective
Permit actions without identification or authentication only when necessary to meet specific healthcare mission needs.
Implementation Guidance
- Document necessary-use cases only (e.g., limited downtime boards).
- Prohibit routine anonymous clinical access.
- Review the necessary-use list annually.
- Compensate with physical controls and monitoring where used.
- Disable legacy 'open station' modes.
- Align with emergency access procedures.
- Communicate expectations to clinical leadership.
- Audit for unauthorized anonymous access paths.
Real-World Use Cases
How this control shows up in healthcare and HIPAA-covered environments.
Prohibited anonymous admin
Anonymous network shares for 'convenience' are banned; necessary-use list is short and approved.
Clinic after-hours myth
'Night mode' without login is removed; only necessary emergency procedures remain.
Best Practices
- Tie AC-14(2) to named owners in IAM/privacy/security.
- Prefer system enforcement over informal email approval.
- Measure coverage on systems that store or transmit ePHI.
- Review exceptions at least quarterly.
- Correlate events into SIEM use cases.
- Document mapping to HIPAA safeguards in the SSP.
Common Gaps & Violations
- Policy claims necessary use only but no technical enforcement on EHR paths.
- Exceptions granted permanently without review.
- Vendors and research feeds left out of scope.
- Logs not retained or not reviewed.
- Upgrades silently disable the control.
Required Documentation
- Policy/procedure for Necessary Use Only (AC-14(2))
- Configuration baselines and diagrams
- Exception register
- Sample logs/alerts
- Training or runbook evidence
How to Test & Validate
- Attempt a prohibited action related to necessary use only; confirm block or required workflow.
- Complete an authorized path; confirm success and logging.
- Sample exceptions for expiry and approval.
- Verify ePHI systems in scope are covered (not only corporate IT).
- Confirm SIEM/alert or retention evidence for the last 90 days.
Audit Considerations
Assessors look for operating evidence of Necessary Use Only on systems touching ePHI — screenshots, logs, and failed-test results — not only a policy paragraph referencing AC-14(2).
HIPAA Mapping
How this NIST control supports HIPAA Security Rule expectations.
- 164.312(a)(1) Access Control — unique user identification; privileged actions need identified users.
- 164.312(a)(2)(ii) Emergency Access Procedure — tightly bound exceptions when normal auth is unavailable.
- 164.312(d) Person or Entity Authentication — verify identity before privileged functions.
- 164.308(a)(4) Information Access Management — limit unauthorized capability.
Compliance Tips
- List AC-14(2) explicitly in the system security plan control matrix.
- Prioritize EHR, VPN, HIE, and BA file-transfer paths.
- Keep a one-page evidence pack (config + sample log + exception list) ready for assessors.
Frequently Asked Questions
Can we run open nursing stations?
Not as a routine pattern — only necessary documented cases.
Who maintains the list?
Security and clinical leadership jointly; keep the list short.
Relation to emergency access?
Emergency access should still identify users when feasible (see AC-14(3)).
References & Resources
- NIST SP 800-53 Rev. 5 — AC-14(2)
- Related controls: AC-14, AC-6, AC-3
Related Guidelines
Related controls that commonly accompany AC-14(2).
Need Help Implementing AC-14(2)?
Our auditors map NIST SP 800-53 controls to your HIPAA Security Rule program — policies, technical evidence, and audit readiness.