New ESD CPT Codes for 2027: What Gastroenterology Practices Must Prepare Now

What Are the New ESD CPT Codes for 2027?

As of the CMS CY 2027 Physician Fee Schedule proposed rule, two new Category I CPT codes for endoscopic submucosal dissection will take effect January 1, 2027, one for the upper GI tract and one for the lower GI tract. They replace the unlisted procedure codes GI practices have used to bill ESD since CMS first recognized the procedure, and they carry the highest proposed physician work RVUs in gastroenterology endoscopy: 15.00 for upper GI and 16.38 for lower GI.

Replaces unlisted codes. ESD has been billed using unlisted endoscopy codes with manual pricing, leading to inconsistent reimbursement and frequent denials. Dedicated Category I codes create a standardized billing path.

Highest work RVUs in GI endoscopy. CMS proposed work RVUs of 15.00 (upper GI ESD) and 16.38 (lower GI ESD), reflecting the complexity and skill required for the procedure.

Prepare before November 2026. Final code numbers and fee schedules publish in November 2026. Practices performing ESD should update documentation templates, charge capture, and payer workflows now.

What the AMA and CMS Announced

In May 2025, the AMA CPT Editorial Panel approved two new Category I CPT codes for endoscopic submucosal dissection: one for the upper gastrointestinal tract and one for the lower gastrointestinal tract, as announced by Olympus Corporation, a primary advocate for the code set. The final code numbers, descriptors, and fee schedules are scheduled for publication in November 2026, with an effective date of January 1, 2027.

CMS then included proposed work RVUs for these codes in the CY 2027 Physician Fee Schedule proposed rule (CMS-1848-P), released July 14, 2026. The proposed values of 15.00 work RVUs for upper GI ESD and 16.38 for lower GI ESD would make them the highest-valued physician work codes in gastroenterology endoscopy. For context, a colonoscopy with snare polypectomy (45385) carries work RVUs of approximately 4.57, and a complex ERCP with stone removal typically falls in the 7 to 9 range. ESD is being valued at roughly three to four times the work of a standard therapeutic colonoscopy, which reflects the procedure’s technical difficulty, longer operative time, and higher complication risk. The broader 2027 Medicare GI payment changes proposed rule also includes a 3% endoscopy payment reduction and a same-day E/M billing cut, so practices performing ESD need to model both the new code revenue and the broader payment pressure together.

Which GI Practices Are Affected?

Any gastroenterology practice or endoscopy center performing ESD is directly affected, but the operational ripple extends further. Practices currently billing ESD with unlisted procedure codes will transition to the new Category I codes on January 1, 2027. Practices considering adding ESD to their procedure mix now have a clear reimbursement framework to model against, which changes the financial calculus for equipment investment and physician training.

The shift also matters for billing teams and revenue cycle partners. Unlisted codes require manual pricing, individual appeals, and payer-by-payer negotiation. Category I codes flow through standard claim adjudication with published fee schedules, modifier rules, and NCCI edit tables. In our experience matching GI practices with billing partners, the practices performing advanced endoscopy procedures on unlisted codes carry the highest denial rates in their entire coding portfolio, often 25% to 40% on those specific lines, because every payer handles unlisted codes differently. Dedicated Category I codes should reduce that friction substantially.

How Does ESD Billing Change in 2027?

The transition from unlisted codes to Category I codes changes nearly every step in the ESD billing workflow:

Billing element	Current (2026, unlisted codes)	2027 (Category I codes)
CPT code	Unlisted endoscopy (e.g., 43499 upper, 45399 lower)	Dedicated upper GI ESD and lower GI ESD codes
Work RVUs	None published; manual pricing required	15.00 (upper) / 16.38 (lower) proposed
Fee schedule	No standard rate; payer-specific negotiation	Published Medicare rate; commercial benchmarking
Claim adjudication	Manual review, frequent holds and denials	Standard electronic adjudication
NCCI edits	No published edit pairs for unlisted codes	Published edit tables once codes are finalized
Prior authorization	Varies widely; unlisted codes trigger extra review	Standardized PA pathways by payer

One question we hear constantly from GI practice administrators is whether they should wait until the final codes publish in November to start preparing. The answer is no. The documentation, operative template, and charge capture changes required are the same regardless of the final code number. Starting now means January 1 is a billing switch, not a workflow overhaul.

How to Prepare Your GI Billing for ESD Codes

Practices that prepare now will bill the new codes cleanly on January 1. Practices that wait until November or December will scramble. These six steps cover the preparation:

1. Update operative report templates to match Category I documentation requirements. The operative note must specify the anatomical location, lesion size, technique used, completeness of resection, and any complications, because payer medical necessity review will key off these details.

2. Build ESD-specific charge capture into your endoscopy workflow. The current process of selecting an unlisted code and attaching a manual price must be replaced with a standard code selection that maps to the new Category I code once published.

3. Contact your top commercial payers and Medicare Advantage plans now. Confirm their timeline for adding the new ESD codes to their fee schedules and prior authorization matrices. Do not assume coverage is automatic on January 1.

4. Model the revenue impact using the proposed work RVUs. At the proposed 15.00 and 16.38 work RVUs, estimate your per-procedure Medicare reimbursement using the 2027 conversion factor and compare it to what you currently collect on unlisted code submissions.

5. Review your NCCI edit and modifier workflows. New Category I codes will carry published NCCI edit pairs. If ESD is performed alongside a diagnostic endoscopy in the same session, the multiple endoscopy payment reduction rules will apply.

6. Confirm your billing partner’s readiness. If you outsource GI billing, verify that your partner has a plan for the new codes, including documentation review criteria, payer outreach, and denial management protocols specific to ESD.

Common Mistakes GI Practices Will Make

Across the billing companies we vet for GI practices, three mistakes repeat whenever a new high-value code launches. The first is assuming that every payer will cover the new code at the published Medicare rate on day one. Commercial payers and Medicare Advantage plans set their own timelines for adding new Category I codes to their fee schedules, and some lag by 3 to 6 months. If your practice performs ESD on a commercially insured patient in January and the payer has not yet loaded the code, the claim will deny or process at a default rate far below the intended value.

The second is failing to update the operative template. ESD documentation that was sufficient for an unlisted code submission, where the payer’s medical reviewer reads the entire note, may not contain the structured elements that automated adjudication systems look for on a Category I code. The note must clearly state the procedure performed, the anatomical site, the method of dissection, whether resection was en bloc, and any mucosal closure performed.

The third is treating ESD the same as EMR (endoscopic mucosal resection) for billing purposes. ESD and EMR are clinically and procedurally distinct, and the new ESD codes are separate from the existing EMR codes (such as 45390 for lower GI EMR). Billing ESD under an EMR code underpays the procedure, and billing EMR under the new ESD code risks an audit. The Gastroenterology Billing matching platform connects practices with billing partners who understand the distinction and can build workflows that prevent this crossover.

Frequently Asked Questions

Next Steps

Review the CMS 2027 PFS proposed rule for the proposed ESD work RVUs and model your per-procedure Medicare reimbursement using the 2027 conversion factor.

Contact your top commercial payers and Medicare Advantage plans in Q4 2026 to confirm their timeline for adding the new ESD codes to their fee schedules.

Update your ESD operative report template and charge capture workflow before the final code numbers publish in November 2026.

If your billing team needs help preparing for the new codes, get matched with a GI-specialized billing company that already manages advanced endoscopy coding.