TL;DR: Aetna, a CVS Health company, modified CPB 0678 governing gastric pacing, gastric electrical stimulation, and gastroesophageal per oral endoscopic myotomy, effective November 27, 2025. Here's what changes for billing teams.
This Aetna gastric pacing coverage policy update under CPB 0678 Aetna system adds G-POEM (gastric per-oral endoscopic myotomy) as a covered procedure with specific medical necessity criteria. The change directly affects CPT codes 43647, 43648, 43881, 43882, 64590, 64595, and 43497, along with a full suite of HCPCS device codes. If your practice bills for gastroparesis procedures or gastric neurostimulator implants, this policy has teeth—and the documentation requirements are detailed enough to generate claim denials if you're not prepared.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | Aetna, a CVS Health company |
| Policy | Gastric Pacing / Electrical Stimulation and Gastroesophageal Per Oral Endoscopic Myotomy |
| Policy Code | CPB 0678 |
| Change Type | Modified |
| Effective Date | November 27, 2025 |
| Impact Level | High |
| Specialties Affected | Gastroenterology, General Surgery, Bariatric Surgery, Endocrinology |
| Key Action | Audit documentation for G-POEM cases to confirm gastric emptying study thresholds and prokinetic trial history before billing CPT 43497 |
Aetna Gastric Pacing and G-POEM Coverage Criteria and Medical Necessity Requirements 2025
The Aetna gastric pacing coverage policy under CPB 0678 draws hard lines. Two procedures get coverage. Several others get labeled experimental. Know which is which before you bill.
Gastric Pacing and Gastric Electrical Stimulation
For gastric pacing (CPT 43647, 43648, 43881, 43882, 64590, 64595) to meet Aetna's medical necessity standard, the member must have chronic gastroparesis confirmed by gastric emptying scintigraphy. That's CPT 78264, 78265, or 78266—make sure those study results are in the record.
Beyond the confirmed diagnosis, the member must have failed dietary modification. They also need documented failure of two out of three classes of prokinetic medications. Those classes include cisapride, domperidone, macrolide antibiotics, metoclopramide, and prucalopride. And they must have failed two out of three classes of anti-emetic medications—anticholinergics, antidopaminergics, antihistamines, phenothiazines, and serotonin 5-HT3 receptor antagonists. All of that failure must be documented over at least one year.
That's a lot of prior treatment history to document. If your clinical notes don't clearly capture the medication classes tried and the duration, expect a denial.
Aetna also covers revision or replacement of a previously approved gastric stimulator (CPT 43648, 43882, 64595) for specific complications: bowel obstruction, gastric wall perforation, infection, lead dislodgement, or lead erosion into the small intestine. "Previously approved" matters here—if the original implant wasn't authorized, the revision won't be either.
G-POEM for Severe Gastroparesis
This is the new addition that makes CPB 0678 worth your attention. Aetna now covers gastric per-oral endoscopic myotomy (G-POEM, billed under CPT 43497) for severe gastroparesis—but only when the member meets all three of these criteria:
| # | Covered Indication |
|---|---|
| 1 | Gastroparesis confirmed by gastric emptying study (GES) with gastric retention greater than 60% at two hours and/or greater than 10% at four hours after meal ingestion |
| 2 | Symptom duration greater than six months |
| 3 | Inadequate response to dietary modification and a trial of at least one prokinetic agent—domperidone, metoclopramide, or erythromycin |
All three criteria must be met. Not two out of three. All three.
The GES thresholds are specific and quantitative. "Abnormal gastric emptying" isn't enough—you need the actual retention percentages documented. Build that into your prior authorization checklist now.
Per-Oral Endoscopic Myotomy for Zenker Diverticulum
Aetna covers per-oral endoscopic myotomy (POEM) for Zenker diverticulum under CPT 43497, alongside the rigid esophagoscopy option under CPT 43180. ICD-10 K22.5 (diverticulum of esophagus, acquired) is the diagnosis code you'll pair with these procedures. This is a narrower indication than many practices assume—coverage here is for Zenker diverticulum specifically, not esophageal diverticulum broadly.
Whether Aetna requires prior authorization for these procedures is not explicitly stated in the policy text, but given the complexity of the medical necessity documentation required—especially for G-POEM—treat prior auth as a strong likelihood. Confirm with Aetna before scheduling.
Aetna Gastric Pacing and G-POEM Exclusions and Non-Covered Indications
This is where CPB 0678 gets strict. Aetna labels a long list of procedures and indications experimental, investigational, or unproven. Billing any of these without a solid coverage policy exception will result in a denial.
G-POEM Exclusions
G-POEM is covered for one indication only: severe gastroparesis meeting the specific criteria above. For everything else, it's experimental. That includes congenital hypertrophic pyloric stenosis. There are no other approved G-POEM indications under this policy.
Aetna also flags the balloon dilation test for identifying G-POEM candidates as experimental. Don't bill it expecting coverage. Same with endoscopic functional luminal imaging probe (EndoFLIP)—whether used to predict G-POEM outcomes or to evaluate clinical success before gastric peroral pyloromyotomy (G-POP), it's not covered.
POEM Exclusions
POEM for achalasia is experimental—except for one narrow carve-out: Type III spastic achalasia. If you're billing CPT 43497 for standard achalasia (K22.0) or non-achalasia spastic esophageal motility disorders (K22.4), Aetna will not cover it. This is a clinically significant distinction that your gastroenterology team needs to understand before the case is scheduled, not after the claim is submitted.
Gastric Pacing Exclusions
Gastric pacing as an initial treatment for gastroparesis is not covered. It's only covered after documented failure of the medication regimens described above. Beyond gastroparesis, Aetna won't cover gastric pacing for autonomic nervous system disorders (G90.1–G90.B), cyclic vomiting syndrome (G43.A0, G43.A1), diabetes without gastroparesis, gastrointestinal dysmotility disorders other than gastroparesis, or obesity (E66.01–E66.9).
Using a second gastric electrical stimulator for nausea and vomiting from chronic gastroparesis is also explicitly experimental. One device. If a case involves dual stimulators, don't expect reimbursement.
Temporary gastric electrical stimulation for predicting success of GES treatment is experimental. And transcutaneous gastric pacing for gastrointestinal motility recovery in early-stage acute pancreatitis (K85.90) is not covered.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| Gastric pacing for refractory chronic gastroparesis | Covered | CPT 43647, 43648, 43881, 43882, 64590, 64595; ICD-10 K31.84, E08.43–E13.43 | Requires 1+ year failed medication history; GES confirmation required |
| Revision/replacement of gastric stimulator for complications | Covered | CPT 43648, 43882, 64595 | Original implant must have been previously approved |
| POEM for Zenker diverticulum | Covered | CPT 43180, 43497; ICD-10 K22.5 | Rigid or transoral endoscopic approaches both covered |
| G-POEM for severe gastroparesis | Covered | CPT 43497; ICD-10 K31.84 | All three criteria must be met; GES retention thresholds are specific |
| POEM for Type III spastic achalasia | Covered | CPT 43497 | Only this achalasia subtype; standard achalasia not covered |
| Balloon dilation test for G-POEM candidate selection | Experimental | — | Not covered under any indication |
| EndoFLIP for G-POEM or G-POP prediction | Experimental | — | Not covered |
| G-POEM for congenital hypertrophic pyloric stenosis | Experimental | — | No coverage for this indication |
| POEM for standard achalasia (K22.0) or non-achalasia motility disorders | Experimental | CPT 43497; ICD-10 K22.0, K22.4 | Denial expected |
| Gastric pacing as initial treatment for gastroparesis | Not Covered | — | Must fail medications first |
| Gastric pacing for cyclic vomiting, obesity, diabetes without gastroparesis, autonomic disorders | Not Covered | ICD-10 G43.A0, G43.A1, E66.x, G90.x | Explicit exclusions in policy |
| Second gastric electrical stimulator | Experimental | — | One device per member; dual stimulators not covered |
| Temporary GES for predicting GES success | Experimental | — | Not covered |
| Transcutaneous gastric pacing for acute pancreatitis | Experimental | ICD-10 K85.90 | Not covered |
Aetna Gastric Pacing and G-POEM Billing Guidelines and Action Items 2025
The effective date of November 27, 2025 is already here. These are the steps your billing team and clinical staff need to take now.
| # | Action Item |
|---|---|
| 1 | Audit your G-POEM documentation template before billing CPT 43497. The GES retention thresholds are specific: greater than 60% at two hours and/or greater than 10% at four hours. Your operative and pre-procedure notes must record the actual percentages, not just "abnormal gastric emptying." Missing this number is a direct path to a claim denial. |
| 2 | Build a prokinetic and anti-emetic trial checklist for gastric pacing cases. For CPT 43647, 43881, or 64590, your records must show failure of two out of three prokinetic classes and two out of three anti-emetic classes over at least one year. Create a structured note template that lists each medication class tried, the duration, and the reason for discontinuation or failure. |
| 3 | Flag POEM cases for achalasia diagnosis codes before submission. CPT 43497 billed with K22.0 (achalasia of cardia) will not pass Aetna's medical necessity review unless the underlying subtype is Type III spastic achalasia. Work with your gastroenterology team to ensure the diagnosis specificity is documented in the clinical record—not just the broader achalasia code. |
| 4 | Remove EndoFLIP and balloon dilation testing from your G-POEM bundled case protocols for Aetna patients. These are explicitly experimental under CPB 0678. If your practice routinely performs these studies as part of G-POEM workup, separate them from the authorization request and counsel patients on out-of-pocket exposure. |
| 5 | Verify prior authorization status for all gastric neurostimulator implant cases under HCPCS C1767, C1778, and L8679. Device codes for the implantable neurostimulator—non-rechargeable generator (C1767), implantable lead (C1778), and neurostimulator pulse generator (L8679)—need to be covered under the same auth as the surgical procedure. A surgery auth without device auth leaves reimbursement on the table. |
| 6 | Review your ICD-10 pairing for diabetic gastroparesis claims. Aetna's policy requires both the diabetic condition code (E08.43, E09.43, E10.43, E11.43, or E13.43) and K31.84 for diabetic gastroparesis cases. Billing K31.84 alone may result in a payer request for additional documentation or a denial. |
If your practice sees a high volume of gastroparesis cases or has G-POEM on the surgical schedule, loop in your compliance officer before submitting claims under the updated billing guidelines. The documentation requirements are granular enough that a single missing data point—like the GES retention percentage at four hours—can unravel an otherwise approvable case.
| Previous Version | Current Version |
|---|---|
| Coverage is considered experimental and investigational for all indications | Coverage is considered medically necessary when specific criteria are met |
| Prior authorization is not required | Prior authorization is required for initial treatment |
| Documentation must include clinical history | Documentation must include clinical history |
| Re-review every 24 months | Re-review every 12 months with updated clinical documentation |
CPT, HCPCS, and ICD-10 Codes for Gastric Pacing and G-POEM Under CPB 0678
Covered CPT Codes (When Selection Criteria Are Met)
| Code | Type | Description |
|---|---|---|
| 43180 | CPT | Esophagoscopy, rigid, transoral with diverticulectomy of hypopharynx or cervical esophagus (e.g., Zenker diverticulum) |
| 43497 | CPT | Lower esophageal myotomy, transoral (i.e., peroral endoscopic myotomy [POEM]) |
| 43647 | CPT | Laparoscopy, surgical; implantation or replacement of gastric neurostimulator electrodes, antrum |
| 43648 | CPT | Laparoscopy, surgical; revision or removal of gastric neurostimulator electrodes, antrum |
| 43881 | CPT | Implantation or replacement of gastric neurostimulator electrodes, antrum, open |
| 43882 | CPT | Revision or removal of gastric neurostimulator electrodes, antrum, open |
| 64590 | CPT | Insertion or replacement of peripheral or gastric neurostimulator pulse generator or receiver, direct or inductive coupling |
| 64595 | CPT | Revision or removal of peripheral or gastric neurostimulator pulse generator or receiver |
| 95980 | CPT | Electronic analysis of implanted neurostimulator pulse generator system |
| 95981 | CPT | Electronic analysis of implanted neurostimulator pulse generator system; subsequent, without reprogramming |
| 95982 | CPT | Electronic analysis of implanted neurostimulator pulse generator system; subsequent, with reprogramming |
Covered HCPCS Codes (When Selection Criteria Are Met)
| Code | Type | Description |
|---|---|---|
| C1767 | HCPCS | Generator, neurostimulator (implantable), non-rechargeable |
| C1778 | HCPCS | Lead, neurostimulator (implantable) |
| C1787 | HCPCS | Patient programmer, neurostimulator |
| C1883 | HCPCS | Adapter/extension, pacing lead or neurostimulator lead (implantable) |
| L8679 | HCPCS | Implantable neurostimulator pulse generator, any type |
| L8680 | HCPCS | Implantable neurostimulator electrode, each |
| L8688 | HCPCS | Implantable neurostimulator pulse generator, dual array, non-rechargeable, includes extension |
HCPCS Codes for Prokinetic and Anti-Emetic Drugs (Referenced in Criteria — Not Separately Covered)
| Code | Type | Description |
|---|---|---|
| J0184 | HCPCS | Injection, amisulpride, 1 mg |
| J0456 | HCPCS | Injection, azithromycin, 500 mg |
| J0780 | HCPCS | Injection, prochlorperazine, up to 10 mg |
| J1200 | HCPCS | Injection, diphenhydramine HCl, up to 50 mg |
| J1240 | HCPCS | Injection, dimenhydrinate, up to 50 mg |
| J1260 | HCPCS | Injection, dolasetron mesylate, 10 mg |
| J1364 | HCPCS | Injection, erythromycin lactobionate, per 500 mg |
| J1626 | HCPCS | Injection, granisetron hydrochloride, 100 mcg |
| J1630 | HCPCS | Injection, haloperidol, up to 5 mg |
| J1631 | HCPCS | Injection, haloperidol decanoate, per 50 mg |
| J1790 | HCPCS | Injection, droperidol, up to 5 mg |
| J2405 | HCPCS | Injection, ondansetron hydrochloride, per 1 mg |
| J2468 | HCPCS | Injection, palonosetron hydrochloride (Posfrea), 25 micrograms |
| J2469 | HCPCS | Injection, palonosetron HCl, 25 mcg |
| J2550 | HCPCS | Injection, promethazine HCl, up to 50 mg |
| J2765 | HCPCS | Injection, metoclopramide HCl, up to 10 mg |
| J2950 | HCPCS | Injection, promazine HCl, up to 25 mg |
| J3230 | HCPCS | Injection, chlorpromazine HCl, up to 50 mg |
| J3250 | HCPCS | Injection, trimethobenzamide HCl, up to 200 mg |
| J3310 | HCPCS | Injection, perphenazine, up to 5 mg |
| J3400 | HCPCS | Injection, triflupromazine HCl, up to 20 mg |
| J3410 | HCPCS | Injection, hydroxyzine HCl, up to 25 mg |
| Q0144 | HCPCS | Azithromycin dihydrate, oral, capsules/powder, 1 gram |
| Q0161 | HCPCS | Chlorpromazine hydrochloride, 5 mg, oral, FDA-approved prescription anti-emetic |
| Q0162 | HCPCS | Ondansetron 1 mg, oral, FDA-approved prescription anti-emetic |
| Q0163 | HCPCS | Diphenhydramine hydrochloride, 50 mg, oral, FDA-approved prescription anti-emetic |
| Q0164 | HCPCS | Prochlorperazine maleate, 5 mg, oral, FDA-approved prescription anti-emetic |
| Q0166 | HCPCS | Granisetron hydrochloride, 1 mg, oral, FDA-approved prescription anti-emetic |
| Q0169 | HCPCS | Promethazine hydrochloride, 12.5 mg, oral, FDA-approved prescription anti-emetic |
| Q0174 | HCPCS | Thiethylperazine maleate, 10 mg, oral, FDA-approved prescription anti-emetic |
| Q0175 | HCPCS | Perphenazine, 4 mg, oral, FDA-approved prescription anti-emetic |
| Q0177 | HCPCS | Hydroxyzine pamoate, 25 mg, oral, FDA-approved prescription anti-emetic |
| Q0180 | HCPCS | Dolasetron mesylate, 100 mg, oral, FDA-approved prescription anti-emetic |
| S0091 | HCPCS | Granisetron hydrochloride, 1 mg |
| S0174 | HCPCS | Dolasetron mesylate, oral, 50 mg |
| S0183 | HCPCS | Prochlorperazine maleate, oral, 5 mg |
Key ICD-10-CM Diagnosis Codes
| Code | Description |
|---|---|
| K31.84 | Gastroparesis |
| E08.43 / E09.43 / E10.43 / E11.43 / E13.43 | Diabetic gastroparesis (requires K31.84 as additional code) |
| E08.00–E08.42, E08.44–E09.42, E09.44–E13.9 | Diabetes mellitus (broader range, contextual) |
| E66.01–E66.1, E66.811–E66.9 | Obesity and morbid obesity (excluded indication) |
| F50.810–F50.89 | Other eating disorders including psychogenic cyclic vomiting |
| G43.A0 | Cyclical vomiting, not intractable (excluded indication) |
| G43.A1 | Cyclical vomiting, intractable (excluded indication) |
| G90.1–G90.B | Disorders of autonomic nervous system (excluded indication) |
| K22.0 | Achalasia of cardia (covered only for Type III spastic subtype) |
| K22.4 | Dyskinesia of esophagus (non-achalasia spastic motility—experimental) |
| K22.5 | Diverticulum of esophagus, acquired (Zenker—covered) |
| K30 | Functional dyspepsia |
| K85.90 | Acute pancreatitis, unspecified (transcutaneous pacing—experimental) |
Get the Full Picture for CPT 43497
Track this policy across versions, search 1,500+ policies by CPT code, and get real-time alerts when any payer changes coverage.