Intragastric Hypothermia — CPB 0527 | AETNA Coverage Update

TL;DR: Aetna modified CPB 0527 for intragastric hypothermia (gastric freezing), effective November 27, 2025. HCPCS code M0100 is explicitly not covered under this policy. Here's what billing teams need to know.

Aetna, a CVS Health company, updated its Aetna intragastric hypothermia coverage policy under CPB 0527 in the Aetna system, confirming that gastric freezing remains experimental, investigational, and unproven for chronic peptic ulcer disease and all other indications. HCPCS code M0100 — the billing code for intragastric hypothermia using gastric freezing — is listed as not covered for any indication in this policy. If your practice or facility has ever submitted M0100 claims to Aetna, the effective date of November 27, 2025 makes this the right moment to audit those submissions.

Quick-Reference Table

Aetna Intragastric Hypothermia Coverage Criteria and Medical Necessity Requirements 2025

The Aetna intragastric hypothermia coverage policy under CPB 0527 is straightforward: there are no covered indications. Aetna does not consider gastric freezing medically necessary for chronic peptic ulcer disease or for any other clinical purpose. The policy language is explicit — insufficient evidence exists to support the procedure's effectiveness.

This is a blanket experimental designation, not a coverage policy with a narrow approval pathway. There are no medical necessity criteria to meet because there is no route to coverage. Prior authorization won't unlock reimbursement here. Even if a physician documents a compelling clinical rationale, Aetna's position under CPB 0527 is that the evidence base doesn't support coverage.

That matters for billing teams because some providers still encounter older clinical protocols that reference gastric cooling or intragastric hypothermia — particularly in academic or research settings. If a clinician performs this procedure assuming it falls under a covered category, the resulting claim will be denied. Full stop.

Aetna Intragastric Hypothermia Exclusions and Non-Covered Indications

Aetna's position here covers the entire procedure class. HCPCS M0100 — intragastric hypothermia using gastric freezing — is not covered for any indication listed in CPB 0527. That list includes chronic peptic ulcer disease, coded under ICD-10-CM codes K27.4 through K27.9.

The policy uses the phrase "experimental, investigational, or unproven." In Aetna's framework, that designation carries specific weight. It means the procedure lacks the clinical evidence to meet Aetna's standard for medical necessity. It also means there's no appeals pathway built on medical necessity arguments — the denial isn't about documentation quality or authorization gaps. The denial is about the procedure itself.

Some providers attempt to bill these cases under alternative codes or bundle them into other procedures. That approach creates compliance risk without improving the odds of reimbursement. If you're not sure how your specific billing situation fits here, talk to your compliance officer before submitting.

Coverage Indications at a Glance

Aetna Intragastric Hypothermia Billing Guidelines and Action Items 2025

The action items here are short because the policy is clear. This isn't a situation with tiered criteria or plan-level variation to chase down. HCPCS M0100 is not covered. Act accordingly.

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

Not Covered / Experimental HCPCS Codes

Key ICD-10-CM Diagnosis Codes

These are the diagnosis codes explicitly referenced in CPB 0527. All six are associated with chronic or unspecified peptic ulcer disease — the primary clinical indication addressed by this policy. All are non-covered when paired with M0100.

A Word on the Procedure Itself

Gastric freezing was developed in the 1960s as a treatment for peptic ulcer disease. It involved circulating a refrigerant through a balloon placed in the stomach to reduce acid secretion. By the 1970s, controlled trials had largely discredited the approach — complications were real and results weren't durable. HCPCS M0100 exists as a legacy billing code for a procedure that medicine has moved away from.

Most billing teams will never encounter M0100 in active use. But "most" isn't "all." Research settings, experimental protocol billing, and legacy charge masters in older EHR systems can all surface this code unexpectedly. Aetna's CPB 0527 modification is a reminder that these legacy designations get reviewed and updated — and that your charge master should reflect current policy, not historical procedures.

This coverage policy change won't reshape revenue for most practices. But for any practice where M0100 has ever been billed, the November 27, 2025 effective date is a clean line. Check your history, clean up your charge capture, and move forward with a clear record.