What are the 2027 ASC payment changes for gastroenterology?
As of July 2026, the CMS calendar year 2027 OPPS and ASC proposed rule, CMS-1850-P, would raise overall ambulatory surgery center facility payment by about 2.4 percent for centers that meet quality reporting. Yet the gastroenterology societies estimate that aggregate ASC payments for many GI procedures would still fall by roughly 2 percent. It is proposed, not final, with comments due August 31, 2026.
A raise that nets to a cut for GI. The 2.4 percent overall increase is offset for gastroenterology, because the American College of Gastroenterology estimates aggregate ASC payments for many GI procedures decline about 2 percent.
More procedures move to the ASC. CMS proposes removing 638 services from the inpatient-only list in year two of a three-year phase-out, including procedures in the digestive clinical family.
Still a proposal. Nothing is final until the 2027 OPPS and ASC final rule, and the comment window closes August 31, 2026.
What CMS Proposed for ASCs
On July 2, 2026, CMS issued the calendar year 2027 OPPS and ASC proposed rule (CMS-1850-P), published in the Federal Register on July 7, with a comment deadline of August 31, 2026. Per the CMS fact sheet, CMS proposes to update ASC facility rates by 2.4 percent for centers that meet quality reporting, built from a 3.2 percent market basket increase reduced by a 0.8 percentage point productivity adjustment.
That headline number is not the number gastroenterology feels. In its member alert on the rule, the American College of Gastroenterology estimates that aggregate ASC payments for many GI procedures would decrease by about 2 percent even with the overall increase, and that GI endoscopy professional payment in ASC and hospital outpatient settings would fall by roughly 3 percent once the separate physician fee schedule proposal is layered in. The rule also continues the three-year phase-out of the inpatient-only list, proposing to remove 638 services this year across clinical families that include the digestive system, and it proposes to drop the Appropriate Follow-Up Interval for Normal Colonoscopy quality measure from the outpatient and ASC quality reporting programs. The table below separates what CMS announced from what it means for a GI center.
| Measure | 2027 proposal | What it means for GI |
| Overall ASC facility update | Plus 2.4 percent | Headline increase for quality-reporting ASCs |
| Aggregate ASC GI procedure pay | ACG estimates about minus 2 percent | Net cut for many GI codes |
| GI endoscopy professional pay | ACG estimates about minus 3 percent | Physician-side cut on the fee schedule |
| Status | Proposed | Not final, comments due August 31, 2026 |
Does This Affect Your Endoscopy Center?
If your practice bills a facility component for endoscopy, whether through an ambulatory endoscopy center or a hospital outpatient department, this rule affects your 2027 revenue. It matters most for high-volume colonoscopy and upper endoscopy programs, where a 2 percent aggregate facility cut compounds quietly across thousands of cases a year.
Across the endoscopy centers we help match to billing partners, facility payment changes like this one are the easiest to miss, because the press release leads with an increase and the operational reality only shows up months later in the remittances. A center reading only the 2.4 percent headline budgets for a raise it will not get on its GI case mix. The practices with the most exposure are freestanding ASCs and GI groups that own their facility, since they carry both the professional and the facility side of every case and feel both proposed cuts at once.
There is also a patient-facing angle. When a screening colonoscopy converts to a diagnostic or therapeutic service in the ASC, the facility claim still has to carry the correct screening indicator, and modifier 33 is what protects the beneficiary from cost sharing they do not owe. A payment cut does not change that rule, it just raises the cost of getting it wrong.
Why the Raise Still Cuts GI Pay
A 2.4 percent overall update can still reduce gastroenterology payment because the update is applied to the whole ASC system, then redistributed across procedures by relative weight. When the weights shift away from high-volume endoscopy, GI can land below the average even when the average rises.
Two forces pull GI down inside a rising system. First, the overall market basket update lifts the pool, but relative value and packaging changes decide how that pool is split, and endoscopy has been a repeated target for downward relativity pressure. Second, the professional side is moving at the same time. The separate CY 2027 physician fee schedule proposal lowers the conversion factor and continues an efficiency adjustment on procedural codes, which is why the gastroenterology societies model a roughly 3 percent professional cut for GI endoscopy on top of the facility change. A GI center that owns both sides of the claim is hit twice, and the two cuts do not show up in the same report, which is what makes the combined impact easy to underestimate.
What It Means for 2027 Endoscopy Revenue
The practical impact depends on your case mix and whether you own the facility. A GI group that bills only the professional side sees the fee schedule cut. A group that owns its ASC sees both the professional cut and the roughly 2 percent aggregate facility decrease on many GI codes.
Put rough numbers on it before you assume the increase helps you. Take a freestanding ASC running a high colonoscopy and EGD volume. If aggregate facility payment on its GI mix falls about 2 percent while the group’s professional endoscopy payment falls about 3 percent, a center that budgeted for the 2.4 percent headline increase is planning against a swing of several points in the wrong direction on its largest service line. The most common issue we see providers run into is treating the headline update as the number that hits their bank account, then discovering the gap a quarter into the new year. The fix is to model your own top ten GI codes against the proposed rates now, while there is still time to comment before August 31, and time to plan staffing and contracts if the proposal finalizes.
Not sure how the 2027 ASC and fee schedule proposals hit your specific GI case mix? A billing partner that models endoscopy facility and professional payment together can show you the real number before January. Get matched with vetted gastroenterology billing companies in about 30 minutes, at no cost.
What Endoscopy Centers Should Do Now
The rule is proposed, not final, but the centers that prepare now will not be caught flat in January. Here is where to start.
- Model your top ten GI facility and professional codes against the proposed 2027 rates, not the 2.4 percent headline.
- Separate the facility-side and professional-side impact so you can see both cuts, since they land in different reports.
- Flag any GI procedures newly added to the ASC-eligible list as the inpatient-only phase-out continues.
- Confirm your screening-to-diagnostic modifier workflow still protects patient cost sharing on converted colonoscopies.
- Review your quality reporting, since a 2 percentage point ASC penalty applies to centers that fail to report.
- Submit a comment to CMS before August 31, 2026, if the proposed cuts would affect your center.
Common Misreadings of the Proposal
The first misreading is the one the headline invites: that a 2.4 percent ASC update means GI revenue goes up. For most gastroenterology case mixes it does not, because the societies estimate the aggregate GI facility effect is a decrease. The second is treating the proposal as settled. It is a proposed rule, comments are open until August 31, 2026, and the final rule can change the numbers. The third is conflating the facility side and the professional side as one payment; they move separately, and an ASC-owning group feels both. The fourth is assuming a discontinued or incomplete colonoscopy in the ASC bills like a completed one. It does not, and modifier 53 governs how the facility reports it. Across the billing companies we vet, the centers that avoid these traps are the ones that model their own codes rather than reading the summary and moving on.
In-House vs a GI Billing Partner
Whether to absorb a change like this in house or hand it to a billing partner comes down to whether your team can model both sides of an endoscopy claim quickly. A single-site group with a strong billing lead may run the analysis fine. A busy ASC juggling professional and facility billing, payer-specific screening rules, and a shifting ASC-eligible list often finds that modeling a dual-sided payment change is exactly the work that gets deferred until the revenue already moved.
Providers often come to us after a facility-payment change has already cost them a quarter, not before, usually because the in-house team did not have the bandwidth to model it in time. Tim Daniels, our Director of Strategic Accounts, hears the same thing from ASC administrators every rulemaking season: the headline said increase, the deposits said otherwise. A billing company with real gastroenterology and ASC experience treats the professional and facility split as routine, so a rate change becomes a modeling exercise instead of a surprise. If you want to compare vetted options, start with a gastroenterology billing services match.
Frequently Asked Questions
When would the 2027 ASC payment changes take effect?
If finalized, the policies would generally apply to services on or after January 1, 2027. CMS issued the proposed rule on July 2, 2026, it was published in the Federal Register on July 7, and the comment period closes August 31, 2026. The final rule usually arrives in the fall.
Does the 2.4 percent increase apply to gastroenterology?
Only as a system-wide update. CMS proposes a 2.4 percent overall ASC facility update, but the gastroenterology societies estimate aggregate ASC payments for many GI procedures would still fall about 2 percent once relative weights are applied. The headline increase and the GI-specific effect are not the same number.
What is the ASC Covered Procedures List?
It is the set of procedures Medicare will pay an ASC to perform. As CMS phases out the inpatient-only list, proposing to remove 638 services this year including digestive procedures, more GI cases can be furnished in an ASC. Newly eligible codes can shift where a case is done and how it is paid.
How is ASC facility payment different from the physician fee schedule?
The facility payment covers the center’s costs for the procedure room, staff, and supplies, set under the OPPS and ASC system. The physician fee schedule pays the gastroenterologist’s professional work separately. A group that owns its ASC bills both, so it feels changes to each system at the same time.
How do we comment on the proposed rule?
CMS accepts public comments on CMS-1850-P through August 31, 2026, with submission instructions in the proposed rule and on the Federal Register listing. Comments from GI centers that model a real payment impact on specific codes tend to carry more weight than general opposition.
Do these changes affect hospital outpatient GI departments too?
Yes. The rule updates both the hospital outpatient prospective payment system and the ASC system, and the 2.4 percent update applies to hospital outpatient departments that meet quality reporting. Hospital-based GI programs should model their endoscopy payment the same way a freestanding ASC would.
Next Steps
Model your own top GI facility and professional codes against the proposed 2027 rates so you know your real exposure before the final rule lands.
If your center converts screening colonoscopies to diagnostic in the ASC, confirm your screening modifier workflow still protects patient cost sharing on those claims.
When you want to see how the 2027 proposals hit your specific case mix, we can connect you with a gastroenterology billing company in about 30 minutes.
The 2027 proposals reward GI centers that model facility and professional payment together and plan early. Gastroenterology Billing matches your practice or ASC with vetted, specialty-experienced billing companies across all 50 states, with rates starting as low as 2.95 percent and a match in about 30 minutes. Getting matched is free to providers.
