Interim Life Safety Measures (ILSM): Triggers and the Full Policy Checklist

An Interim Life Safety Measure (ILSM) is a temporary compensating action a hospital puts in place whenever a required fire- or life-safety feature is out of service, bypassed, or impaired — most often because construction or renovation is underway, or because a Life Safety Code deficiency has been identified and can’t be corrected immediately. The requirement traces back to NFPA 101, the Life Safety Code, which CMS-certified hospitals must follow under 42 CFR 482.41(b)(1)(i) (2012 edition, with Technical Interim Amendments 12-1 through 12-4) — see CASRAI’s NFPA 101 Life Safety Code guide for the full K-tag/survey mechanics. Accreditation organizations then build ILSM into their own Environment of Care survey process, so a hospital’s written ILSM policy is one of the first things a surveyor asks to see whenever active construction is visible on a tour.

This guide is written for infection preventionists, patient-safety officers, quality directors, and risk managers who own or co-own the ILSM program — not for the construction or facilities team executing it. It covers when ILSM actually applies, the checklist a written policy needs to address, and how ILSM interacts with the parallel infection-control process running on the same project.

When ILSM Is Triggered

ILSM applies in two distinct situations, and a hospital’s policy should name both explicitly rather than treating “construction” as the only trigger:

1. A required life-safety feature is impaired. The fire alarm/detection system, the automatic sprinkler or suppression system, a fire or smoke barrier, or a means of egress is taken out of service — whether that’s because construction work has breached a wall, a contractor has shut down a sprinkler zone to tie in new piping, or a system has simply failed and is awaiting repair. NFPA 101’s life-safety-compliance-options framework treats any impairment of this kind as an ILSM trigger, and the commonly applied threshold in hospital policy is an impairment expected to last more than four hours within a 24-hour period — below that, a documented fire watch or equivalent short-duration compensating measure is typically sufficient without invoking the full ILSM plan.
2. An identified Life Safety Code deficiency can’t be corrected immediately. This includes a K-tag deficiency cited on a CMS, state-agency, or accreditation-organization survey, or one a hospital’s own facilities team self-identifies during routine EC rounds. Until the permanent fix is complete — which may take weeks if it requires capital work — the hospital documents interim compensating measures as part of its Plan for Correction. See CASRAI’s NFPA 101 guide for how K-tags, Form CMS-2786R, and the FSES equivalency route fit together.

Both triggers can apply at once on a single project: an active construction job that has also, incidentally, taken a fire-alarm zone offline is both a construction-driven ILSM and an impairment-driven ILSM running concurrently.

The ILSM Checklist: What a Policy Must Address

Hospital ILSM policies vary slightly in how they group and number the individual measures — some templates present 12 or 13 core items, others split a combined item into two and land on 14 — but the substance is consistent across NFPA 101’s interim-measures framework and the templates accreditation surveyors are trained to check against. A complete written policy addresses all of the following:

1. Egress. Confirm and maintain free, unobstructed exit access and egress routes through and around the affected area for the duration of the impairment.
2. Fire department access. Maintain clear, unobstructed access to fire hydrants and fire department connections serving the building.
3. Alternative fire detection. If the fire alarm or detection system is impaired, establish an alternative means of detection — typically a roving fire watch on a defined, documented interval — until the system is restored.
4. Alternative fire suppression. If the sprinkler or suppression system is impaired, establish alternative extinguishing measures for the affected area and notify the local fire department of the impairment.
5. Temporary barrier construction. Any temporary construction partition must be smoke-tight and built of noncombustible or limited-combustible material.
6. Fire and smoke barrier integrity. Where a required fire or smoke barrier is temporarily breached for construction access, maintain equivalent protection (temporary barriers, monitored openings) until the permanent barrier is restored.
7. Increased inspection frequency. Increase the frequency of fire-safety inspections of the construction area and the occupied spaces adjoining it for as long as the impairment is active.
8. Increased fire drills. Increase the frequency of fire drills for staff in the affected area — commonly quarterly moved to monthly, or per the hospital’s own policy threshold — so response stays current while normal egress patterns are disrupted.
9. Additional firefighting equipment. Provide additional portable fire extinguishers or other firefighting equipment appropriate to the specific impairment.
10. Flammable/combustible material controls. Prohibit the storage or use of flammable and combustible materials in or immediately adjacent to the construction area.
11. Staff education. Educate staff who work in or near the affected area on the specific ILSM measures currently in effect and their own role in them (who to call, where the alternate egress route is, what the fire watch schedule is).
12. Increased surveillance. Increase surveillance of the building, grounds, and equipment, with particular attention to the construction area itself and to the storage of construction materials.
13. Fire department notification. Notify the local fire department whenever a required fire-protection feature is out of service — listed as its own line item in some templates, folded into the alternative-suppression measure in others, which is the most common source of the 13-vs-14-item count difference between hospital policies.
14. Written documentation. Document the ILSM plan in writing before work begins: which of the measures above apply, the specific area covered, the start date and expected end date, and who is responsible for monitoring and closing it out. Reassess and update the documentation if the project’s scope or duration changes.

A surveyor doing an Environment of Care tracer during active construction will typically ask for three things on the spot: the written ILSM plan for that project, the fire-watch or drill log showing the increased-frequency measures are actually being performed (not just documented as policy), and evidence that staff working in the area can describe the measures in effect — CASRAI’s Joint Commission tracer methodology guide covers how that line of questioning typically unfolds during a survey.

ILSM and the ICRA Permit: Two Parallel Processes on the Same Project

ILSM is easy to conflate with an Infection Control Risk Assessment (ICRA), because the same construction project usually triggers both — but they govern different risks and are documented separately. ICRA is the process that classifies construction activity against the patient population it will affect to determine required infection-control precautions (dust containment, negative-pressure barriers, HEPA filtration); CASRAI’s ICRA guide covers the full risk matrix. ILSM is the parallel process that covers fire and life-safety compensating measures — egress, detection, suppression, and barrier integrity — for the same work.

In practice, a project large enough to require an ICRA Class III or Class IV infection-control permit (major demolition, new construction, or work affecting multiple systems) is almost always also large enough to impair a life-safety feature and trigger ILSM. Facilities, infection prevention, and patient safety should sign off on both permits before work begins, not treat one as a substitute for the other — a common survey finding is a hospital that documented a thorough ICRA for a project but had no corresponding ILSM plan on file, or vice versa.

Who Owns the ILSM Program

Facilities/engineering typically executes the physical measures (fire watch rounds, temporary barriers, alternative suppression), but the Environment of Care committee — where patient safety, infection prevention, quality, and risk management all sit — is where the policy itself is reviewed, and where a survey finding tied to a missing or incomplete ILSM plan ultimately lands as a Requirement for Improvement. Accreditation differs slightly by accrediting organization in how it structures the Environment of Care survey; CASRAI’s DNV vs Joint Commission comparison covers how the two most common hospital accreditors differ on survey cadence and structure, including the Environment of Care and life-safety review.

Frequently Asked Questions

Who is responsible for implementing ILSM?

Facilities/engineering typically executes the physical measures, but the Environment of Care committee — which includes patient safety, infection prevention, quality, and risk management — owns the policy and is accountable for it during survey. Assign a named individual to monitor and close out each specific ILSM instance, not just “facilities” as a department.

How long can ILSM stay in effect?

For the duration of the impairment or construction project — there’s no fixed maximum, but the written plan should carry an expected end date, and the plan should be reassessed (not just left in place unchanged) if the project’s scope or timeline shifts.

Does ILSM apply to hospitals accredited by an organization other than the Joint Commission?

Yes. The underlying requirement comes from NFPA 101 as adopted into the CMS Conditions of Participation for hospitals (42 CFR 482.41), which applies regardless of which CMS-approved accreditation organization surveys the hospital — Joint Commission, DNV, HFAP, or CIHQ all build ILSM compliance into their Environment of Care survey process.

What’s the difference between ILSM and a fire watch?

A fire watch is one specific ILSM measure — an alternative means of fire detection used when the fire alarm system is impaired. ILSM is the broader category: the full set of compensating measures (egress, suppression, barriers, drills, documentation) a hospital puts in place, of which a fire watch may be one component.

See CASRAI’s patient safety pillar page for the full set of accreditation, survey-readiness, and infection-prevention guides this connects to, including NFPA 99 Health Care Facilities Code and what a Joint Commission survey agenda actually covers.