C9791 HCPCS Level II code: Magnetic resonance imaging with inhaled hyperpolarized xenon-129 contrast agent, chest, including preparation and administration of agent
C9791 is the HCPCS code for “Magnetic resonance imaging with inhaled hyperpolarized xenon-129 contrast agent, chest, including preparation and administration of agent” in CMS’s October 2026 release, in effect from Oct 1, 2026.
Official description
C9791Magnetic resonance imaging with inhaled hyperpolarized xenon-129 contrast agent, chest, including preparation and administration of agent
Short description: Mri hyperpolarized xenon129
HCPCS · United States
Medicare details
The indicators CMS publishes with C9791 in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Special coverage instructions apply
- Medicare pricing
- Statute
- Type of service
- Diagnostic radiology
- BETOS category
- Advanced imaging - MRI/MRA: other
- Coverage statute
- 1833(t)
- Added
- Oct 1, 2023
Where C9791 sits
- 1C codesOutpatient prospective payment system
- 2Active code C9791Magnetic resonance imaging with inhaled hyperpolarized xenon-129 contrast agent, chest, including preparation and administration of agent
Source and release
- Data release
- HCPCS Level II · October 2026
- Effective date
- Oct 1, 2026
- Publisher
- CMS
This page is built from the HCPCS Level II catalog that Vero Codes reads when it suggests codes: Centers for Medicare & Medicaid Services’s October 2026 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does HCPCS code C9791 mean?
C9791 is the HCPCS code for “Magnetic resonance imaging with inhaled hyperpolarized xenon-129 contrast agent, chest, including preparation and administration of agent” in CMS’s HCPCS Level II October 2026 release.
Does Medicare cover C9791?
CMS lists C9791’s Medicare coverage as “Special coverage instructions apply” and its pricing as “Statute”. Coverage and payment still depend on the patient, the setting, the documentation and the payer.
Which HCPCS Level II release does this page use?
It uses CMS’s October 2026 release, in effect from Oct 1, 2026 to Dec 31, 2026. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.
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