Intragastric Hypothermia — CPB 0527 | AETNA Coverage Update

TL;DR: Aetna modified CPB 0527, confirming that intragastric hypothermia (gastric freezing) billed under HCPCS M0100 is not covered for chronic peptic ulcer disease or any other indication, effective November 27, 2025. Here's what billing teams need to do.

Aetna, a CVS Health company, updated this Aetna intragastric hypothermia coverage policy under CPB 0527 Aetna system. The policy is unambiguous: HCPCS M0100 is non-covered across the board. If your gastroenterology or general surgery billing team has ever attempted to bill M0100 for peptic ulcer disease — coded under K27.4 through K27.9 — this policy locks the door completely. No medical necessity pathway exists. No prior authorization will unlock it. The procedure is classified as experimental, investigational, and unproven.

Quick-Reference Table

Aetna Intragastric Hypothermia Coverage Criteria and Medical Necessity Requirements 2025

The short version: there are no coverage criteria for intragastric hypothermia under Aetna's CPB 0527. The procedure does not meet Aetna's definition of medical necessity for any indication. That's not a gap in the policy document — it's the policy.

Intragastric hypothermia, also called gastric freezing, was once explored as a treatment for chronic peptic ulcer disease. The premise was that cooling the stomach lining would reduce acid secretion and promote ulcer healing. Clinical evidence never backed that up, and the procedure fell out of mainstream use decades ago.

Aetna's coverage policy makes no distinction between patient populations, severity of peptic ulcer disease, or prior treatment history. The determination applies universally. Because this procedure is classified as experimental and unproven, prior authorization is unlikely to result in approval — consult your Aetna contract for prior auth applicability.

If your billing team is ever asked whether Aetna covers intragastric hypothermia for a patient with chronic peptic ulcer disease — diagnosed under ICD-10-CM codes K27.4, K27.5, K27.6, K27.7, K27.8, or K27.9 — the answer is no. Document that clearly in your denial response workflows.

Aetna Intragastric Hypothermia Exclusions and Non-Covered Indications

Aetna's CPB 0527 classifies gastric freezing as experimental, investigational, and unproven. That triple classification matters for your billing and appeals strategy.

"Experimental or investigational" is a specific payer designation. It signals that the evidence base is insufficient to support routine clinical use. This is not a coverage exclusion tied to diagnosis — it's a blanket determination about the procedure itself.

"Unproven" goes a step further. It tells you that even within an investigational context, Aetna does not consider the clinical literature adequate to support reimbursement. You will not win a medical necessity appeal on this one. The policy language is designed to hold at the administrative level.

The designated indication in CPB 0527 is chronic peptic ulcer disease. But the policy explicitly states "or any other indications." That language closes the door on off-label billing arguments. If a provider tries to bill M0100 for any indication — erosive gastritis, GERD, gastroparesis, anything — the answer is the same: not covered.

Coverage Indications at a Glance

Aetna Intragastric Hypothermia Billing Guidelines and Action Items 2025

This policy is a clean-up update, not a sudden shift. But that doesn't mean your billing team has nothing to do. If M0100 is still sitting in your charge master, or if your claim scrubber isn't flagging it, you have exposure.

Here's what to do before December 15, 2025:

If your organization bills for any experimental procedures under compassionate use or research protocols, loop in your compliance officer before the next submission cycle. The experimental classification in CPB 0527 creates specific documentation requirements under those frameworks.

CPT, HCPCS, and ICD-10 Codes for Intragastric Hypothermia Under CPB 0527

Not Covered / Experimental HCPCS Codes

Key ICD-10-CM Diagnosis Codes

These six codes cover the chronic peptic ulcer disease spectrum addressed in CPB 0527. All are non-covered when billed with HCPCS M0100 under Aetna.

Code descriptions are reproduced exactly as listed in Aetna CPB 0527 and may not reflect full ICD-10-CM tabular detail.

Note: Aetna's CPB 0527 extends the non-coverage determination beyond peptic ulcer disease to all other indications. The K27 codes listed above represent the specific indications named in the policy, but the experimental classification applies to HCPCS M0100 regardless of diagnosis code.