Anesthesia outside the OR: endoscopy, cath lab and sedation policy

A subsidy review broken down by location usually turns up something the surgical schedule does not explain: a meaningful share of anesthesia coverage cost sits in the endoscopy suite, the cath lab, or interventional radiology, far from the main ORs, in rooms that run case after short case all day.

That is non-operating room anesthesia, or NORA, and it costs differently than OR anesthesia. Our piece on why your anesthesia subsidy keeps rising covers the Medicare and labor forces behind the broader trend; this one covers what is specific to sites outside the OR: why they cost more per staffed hour, who may sedate a patient there, and why that decision belongs to your medical staff before your finance committee.

Why a GI lab or cath lab room costs more to staff than an OR

Anesthesia coverage cost tracks staffed hours, not billed hours. In the main OR, a long case lets a clinician turn one anesthetic into enough units to cover a good share of the room's staffed day. NORA breaks that math a few ways.

Cases are short. A routine endoscopy takes a fraction of the anesthesia time of a typical OR case, so a clinician staffing that room all day accumulates far fewer time units than one staffing an OR running longer cases.

NORA sites are also scattered and outside anesthesia's own scheduling control. A 2025 study built on a year of one hospital's anesthesia billing records found that these sites suffer from geographic isolation and lack the dedicated block allocation the OR has: the schedule is set by the endoscopy or cardiology service, and anesthesia staffs around it.¹ The same study found standard anesthesia productivity measures, units billed per clinician, translate poorly to NORA, because case volume, base units per case and achievable concurrency sit largely outside anesthesia's control there.¹

Facility layout compounds it. The American Hospital Association's 2024 knowledge exchange on NORA growth, developed with the American Society of Anesthesiologists (ASA), recommends siting new NORA locations close to the OR, centralizing scheduling across NORA services, and tracking on-time starts, case length and anesthesia-minute utilization by room, because travel time and mismatched schedules are where staffed hours stop lining up with billable work.²

The sedation continuum, and who may administer each level

Not every patient in a GI lab or cath lab needs an anesthesia professional. Federal and professional guidance draws a specific line, and your medical staff needs it clear before it sets policy.

The ASA defines four points on one continuum: minimal sedation, where a patient responds normally to commands; moderate sedation, or conscious sedation, where the patient responds purposefully to voice or touch and keeps their own airway; deep sedation, where the patient responds only to repeated or painful stimulation; and general anesthesia, where the patient cannot be roused at all.³ Monitored anesthesia care, or MAC, sits alongside that scale as a specific service performed by a qualified anesthesia provider for a procedure that may call for any point up to general anesthesia.³ (Our billing explainer covers MAC's own billing modifiers.)

CMS builds a regulatory line on top of that continuum. Its hospital interpretive guidelines for the anesthesia services condition of participation state that deep sedation and MAC are anesthesia services, while moderate and minimal sedation are not: CMS, consistent with the ASA's own definitions, does not classify moderate or minimal sedation as anesthesia.⁴ That distinction decides which patients trigger 42 CFR 482.52's requirements, a single hospital-wide anesthesia service under one physician director, and which your medical staff can cover under a separate moderate-sedation policy for non-anesthesia staff. The same guidance names the endoscopy suite among the areas a hospital's anesthesia service typically covers.⁴ Our explainer on care team models covers how physician anesthesiologists, CRNAs and CAAs are staffed and paid once a case crosses that line.

Two positions on who should give deeper sedation for routine endoscopy

For minimal and moderate sedation, hospitals already have flexibility. Where the medical staff's moderate-sedation policy and state rules allow it, trained registered nurses working under a physician's order commonly administer and monitor those levels without an anesthesia professional present. The ASA's statement on privileging non-anesthesia practitioners describes the required training: managing sedative and analgesic drugs, using reversal agents, and recognizing when a patient needs to be rescued.⁵

The harder question is propofol, which many endoscopy units prefer for deeper sedation because patients tolerate it well and recover fast. It also has no reversal agent, a large part of why opinion on who should give it splits. The American Society for Gastrointestinal Endoscopy's sedation guideline endorses non-anesthesiologist-administered propofol, delivered by a trained nurse under the endoscopist's direction, citing case series showing it can be done safely in average-risk patients, provided a physician stays present and immediately available and the plan accounts for the patient's ASA physical status and airway risk.⁶ The ASA's statement on propofol takes a different position: a patient given propofol should get the monitoring and rescue readiness of deep sedation even when only a moderate level is intended, so the standard of care, in the ASA's view, is to limit propofol to anesthesia professionals unless a non-anesthesia practitioner administering it is equally trained and equipped to manage that deeper, unintended state.⁷ Both positions agree that patient risk should set the sedation plan; they differ on where the line falls for the average, healthy patient having a routine exam.

The volume behind that disagreement is documented. National claims data found anesthesia-service use in outpatient endoscopy and colonoscopy roughly doubled between 2003 and 2009, from about 14 percent of procedures to more than 30 percent, with more than two-thirds of that care going to low-risk patients, and payments doubling for Medicare beneficiaries and quadrupling for the commercially insured.⁸ A follow-up study covering 2010 to 2013 found the trend had not leveled off: anesthesia use reached 47.6 percent of Medicare and 53.0 percent of commercially insured GI procedures by 2013, use in low-risk patients was still up 14 to 15 percent, and spending on those patients kept climbing.⁹ Neither study concludes anesthesia-provider sedation is unnecessary in a given case. Both show growth concentrated in patients least likely to need it on clinical grounds alone, which is why the decision belongs to your medical staff, not a billing analysis.

This is a medical staff decision, not a finance decision

It is tempting to route the endoscopist-versus-anesthesia-provider question through a subsidy negotiation's lens: which model costs less. That is the wrong committee to own the decision.

Federal regulation puts one physician in charge of a single, hospital-wide anesthesia service, and CMS surveyors check that a hospital's anesthesia policies say which practitioners may administer moderate sedation, which national guidelines those policies follow, and how adverse events get tracked.⁴ Those are medical staff bylaws questions, who gets privileged to do what and under what supervision, reviewed through credentialing and quality processes, not the finance committee's. The ASA's statement on NORA services goes further, recommending the hospital's anesthesia director be involved from the planning stage whenever a NORA site is built or remodeled, so equipment, staffing and monitoring standards match what the OR already requires.¹⁰

This is not a savings decision. It is a patient safety and privileging decision that happens to carry a cost. Let the subsidy number set the sedation policy, and the hospital still owns the outcome under its own condition of participation, whichever committee signed off.

Operational levers that change the cost without touching who is allowed to sedate

A few operational choices affect what NORA coverage costs, separate from the sedation-policy question above.

• Consolidate NORA into fewer, better-used rooms. Five endoscopy and cath lab rooms running half-full each cost more than three at higher utilization. The AHA's 2024 guidance recommends centralizing NORA scheduling and tracking on-time starts, case length and anesthesia-minute utilization by room, so a hospital can see which rooms earn their staffed day.²
• Block-schedule NORA the way you block-schedule the OR. Left unmanaged, schedules follow the proceduralist's clinic, not an agreed anesthesia block, part of why the study above found NORA sites lack the block allocation an OR team plans around.¹ A negotiated block gives the group a schedule to staff against instead of a stream of add-ons.
• Match the provider to the patient's risk, not the room. A healthy patient having a routine screening colonoscopy and one with severe cardiopulmonary disease having the same procedure call for different sedation decisions. Build ASA physical status and airway assessment into pre-procedure screening, so the smaller share of patients who need an anesthesia professional are flagged before they reach the procedure table.

What to put in the coverage grid and the contract

Translate the policy into a document your anesthesia group, GI and cardiology services, and medical staff office can all point to.

Element	What it should specify
Site-by-site sedation model	Default per NORA location: moderate sedation by non-anesthesia staff, anesthesia-provider MAC, or a mix by procedure type.
Escalation triggers	The ASA physical status class or procedure complexity that moves a case to anesthesia coverage, set by the medical staff, not the day's schedule.
Coverage hours and block structure	Which hours each site has coverage, and whether it is block-scheduled or add-on, so the group staffs an agreed day.
Staffing mix	Which of physician anesthesiologists, CRNAs and CAAs cover each site, and under what supervision, consistent with state law and credentialing.
Reporting	Case volume, on-time starts and anesthesia-minute utilization by site, on a schedule the hospital can use at the next subsidy conversation.

These terms do not change who is allowed to sedate a patient. They make sure the sedation policy your medical staff already approved is followed room by room, and that its cost shows up in the contract instead of arriving as a surprise at renewal. A coverage and subsidy review is typically where this grid gets built, alongside the benchmarking in anesthesia subsidy benchmarks.

NORA is not going away, and by most accounts it will keep growing as a share of anesthesia practice, along with the subsidy line behind it: short cases, scattered rooms, coverage that outlasts the day's volume. What your hospital controls is whether that sedation policy was written by the people responsible for patient safety, tested against the evidence on who it serves, and priced only after that.

Sources

1. Justin S. Routman, Erik J. Zhang, Jonathan D. Blocker, Juhan Paiste and Mitchell H. Tsai, "Using Performance Frontiers To Evaluate Non-OR Anesthesia (NORA) Efficiency," Journal of Medical Systems, July 2025. https://pmc.ncbi.nlm.nih.gov/articles/PMC12238198/ ↩ ↩² ↩³

2. American Hospital Association, "Enabling Growth in Nonoperating Room Anesthesia Procedures Amid Workforce Shortages," AHA Member Knowledge Exchange, June 2024. https://www.aha.org/member-knowledge-exchange/2024-06-05/enabling-growth-nonoperating-room-anesthesia-procedures-amid-workforce-shortages ↩ ↩²

3. American Society of Anesthesiologists, "Statement on Continuum of Depth of Sedation: Definition of General Anesthesia and Levels of Sedation/Analgesia," ASA Standards and Practice Parameters, October 2024 (originally approved 1999). https://www.asahq.org/standards-and-practice-parameters/statement-on-continuum-of-depth-of-sedation-definition-of-general-anesthesia-and-levels-of-sedation-analgesia ↩ ↩²

4. Centers for Medicare & Medicaid Services, "State Operations Manual, Appendix A – Survey Protocol, Regulations and Interpretive Guidelines for Hospitals, Tag A-1000, §482.52 Condition of Participation: Anesthesia Services," CMS Manual System, Pub. 100-07 State Operations (Transmittal 74), December 2011. https://www.cms.gov/Regulations-and-Guidance/Guidance/Transmittals/downloads/R74SOMA.pdf ↩ ↩² ↩³

5. American Society of Anesthesiologists, "Statement on Granting Privileges for Administration of Moderate Sedation to Practitioners Who Are Not Anesthesia Professionals," ASA Standards and Practice Parameters, October 2021 (originally approved 2006). https://www.asahq.org/standards-and-practice-parameters/statement-on-granting-privileges-for-administration-of-moderate-sedation-to-practitioners-who-are-not-anesthesia-professionals ↩

6. ASGE Standards of Practice Committee (Dayna S. Early, Jenifer R. Lightdale, John J. Vargo II, et al.), "Guidelines for Sedation and Anesthesia in GI Endoscopy," Gastrointestinal Endoscopy, February 2018. https://www.asge.org/home/resources/publications/guidelines/guidelines-for-sedation-and-anesthesia-in-gi-endoscopy ↩

7. American Society of Anesthesiologists, "Statement on Safe Use of Propofol," ASA Standards and Practice Parameters, October 2024 (originally approved 2004). https://www.asahq.org/standards-and-practice-parameters/statement-on-safe-use-of-propofol ↩

8. Hangsheng Liu, David A. Waxman, Regina Main and Soeren Mattke, "Utilization of Anesthesia Services During Outpatient Endoscopies and Colonoscopies and Associated Spending in 2003-2009," JAMA, March 2012. https://pubmed.ncbi.nlm.nih.gov/22436958/ ↩

9. Zachary Predmore, Xiaoyu Nie, Regina Main, Soeren Mattke and Hangsheng Liu, "Anesthesia Service Use During Outpatient Gastroenterology Procedures Continued to Increase From 2010 to 2013 and Potentially Discretionary Spending Remained High," American Journal of Gastroenterology, February 2017. https://pubmed.ncbi.nlm.nih.gov/27349340/ ↩

10. American Society of Anesthesiologists, "Statement on Nonoperating Room Anesthesia Services," ASA Standards and Practice Parameters, October 2023 (originally approved 1994). https://www.asahq.org/standards-and-practice-parameters/statement-on-nonoperating-room-anesthesia-services ↩