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Federal IDR · Code overview
Out of network Coronary artery bypass, single arterial graft, CPT 33533
The denial, the code, and the path to recovery.
Out of network Coronary artery bypass, single arterial graft (CPT 33533) is routinely paid below the billed charge or denied outright. Most practices treat what arrives as the amount owed. Under the No Surprises Act it is an opening offer, and federal independent dispute resolution exists to contest it. We prepare the submission, and we can file it for you.
- Code
- CPT 33533
- Body region
- chest / cardiac
- Typical setting
- hospital operating room
Coronary artery bypass using a single arterial graft — a major operation that routinely requires a surgical assistant.
Why Coronary artery bypass, single arterial graft gets paid short out of network
Anchored to the qualifying payment amount (QPA)
The plan pays Coronary artery bypass, single arterial graft at its own qualifying payment amount — its median in-network rate for the area — and treats that as the answer. Under the No Surprises Act the QPA is the plan's opening anchor, not a cap, and certified IDR entities weigh several other factors against it.
Out-of-network reduction with no contract on file
With no negotiated rate for Coronary artery bypass, single arterial graft (CPT 33533), the allowed amount is reduced to an out-of-network schedule that rarely reflects what the chest / cardiac procedure actually involves in a hospital operating room setting.
Down-coding or documentation holds
Coronary artery bypass, single arterial graft claims are frequently held or down-coded pending operative notes, then paid short once submitted — a gap federal IDR is designed to contest with the right clinical record attached.
The federal pathway to recovery
There is a defined federal pathway between a payer's underpayment and a binding arbitrated amount: an open negotiation window, an eligibility determination, a batching decision, then arbitration. Each step has a hard deadline, and missing one forfeits the claim. Sydra screens eligibility, assembles the evidence and offer, files, and tracks every deadline so a Coronary artery bypass, single arterial graft claim never lapses by default.
Providers win roughly 88% of IDR determinations they contest. Sydra is a flat, predictable fee — less than half of what most contingency firms charge. We file it, you keep the recovery.
Coronary artery bypass, single arterial graft (CPT 33533) — common questions
Can out-of-network Coronary artery bypass, single arterial graft (CPT 33533) claims go through federal IDR?
Yes. If the item or service qualifies under the No Surprises Act and open negotiation has passed without resolution, either party can initiate independent dispute resolution to contest the payment on CPT 33533.
Why is Coronary artery bypass, single arterial graft underpaid out of network?
Assistant-at-surgery services are billed on the primary operation with modifier 80, 81, 82, or AS, and are frequently out of network even when the primary surgeon is in network — a protected No Surprises Act claim insurers routinely deny or underpay. Insurers anchor to the qualifying payment amount and apply out-of-network reductions, which is exactly what federal IDR exists to contest.
What does Sydra do with a Coronary artery bypass, single arterial graft denial?
Sydra checks whether the Coronary artery bypass, single arterial graft claim qualifies, assembles a compliant IDR submission with the supporting evidence and your offer, tracks every deadline, and can file it for you — for a flat fee, never a percentage of the recovery.
Related codes
Browse all Assistant Surgeons codes, or return to the Federal IDR hub.
Coronary artery bypass, single arterial graft denials by state
No outcome is guaranteed. Results vary by claim, payer, specialty, and documentation. Any general figures reflect the published federal record across all disputes, not a prediction about your claim. This is general information, not legal or financial advice.
Medically & clinically reviewed by Dr. John M. Abrahams, MD
Board-certified neurosurgeon and founder of Sydra · Last reviewed September 2026 · About the author
Sources
Figures reflect the published federal record across all disputes, not a prediction about any individual claim. This is general information, not legal or financial advice.