HCPCS code C1722: Single-chamber defibrillator billing guide

Key Takeaways

HCPCS code C1722 identifies a single-chamber implantable cardioverter-defibrillator (AICD), reported only by facilities on the UB-04 under Medicare OPPS

C1722 is billed with revenue code 0278 and paired with the CPT code for the implant itself, typically 33240 or 33249, never on its own claim line

CMS packages C1722 into the implant procedure’s APC payment; its pass-through eligibility expired back in 2002, so no separate device fee applies today

Practice management software like Pabau helps facility billing teams track device C-codes, flag revenue code mismatches, and cut down C1722 claim denials

HCPCS code C1722 identifies a single-chamber implantable cardioverter-defibrillator. It’s the device a cardiologist places under the skin to shock a dangerously irregular heartbeat back into rhythm. CMS classifies it as a facility-only C-code, reported on the UB-04 alongside the CPT code for the implant procedure itself. It’s never billed as a standalone charge.

Coders sometimes reach for the wrong neighbor in this code range. C1722 sits close to codes for pacemakers, leads, and other cardiac devices. Mixing them up flows straight through to the revenue code, the diagnosis pairing, and the reimbursement. Getting the device identity right at the coding stage saves a rework cycle later.

What HCPCS code C1722 covers

The official CMS long descriptor reads: Cardioverter-defibrillator, single chamber (implantable). The short descriptor used in claims processing is “AICD, single chamber,” AICD being the older shorthand for automatic implantable cardioverter-defibrillator.

Clinically, the device goes to patients at meaningful risk of a fatal ventricular arrhythmia. That includes sustained ventricular tachycardia, ventricular fibrillation, or a prior sudden cardiac arrest.

HCPCS code C1722: The details at a glance

The table below summarizes the core reference data for HCPCS code C1722. Always confirm the descriptor against the current-year CMS HCPCS annual release file, since code statuses are reviewed every fiscal year.

One quick check before you code C1722: the device has to be physically implanted during the reported encounter. Ordering or stocking an ICD doesn’t create a billable line on its own. See the documentation section below for exactly what the record needs to show.

C-series device codes: Where C1722 fits

C-series codes are a distinct subset of HCPCS Level II, created specifically for the Medicare Hospital Outpatient Prospective Payment System. J-codes cover drugs and biologicals, and L-codes cover orthotics and prosthetics.

C-codes describe medical devices instead, ones that hospitals report alongside the procedure’s APC payment. Here’s what governs the group as a whole.

• Facility-only codes: C-series codes, including C1722, are reported exclusively by hospital outpatient facilities. Physician practices billing on CMS-1500 don’t use C-codes at all.
• OPPS-specific purpose: hospitals receive an Ambulatory Payment Classification (APC) payment for the procedure. Device C-codes let CMS track the device cost against that APC, and occasionally pay for it separately.
• Pass-through eligibility: new or costly devices can qualify for temporary pass-through status, paid separately from the APC. It only lasts two to three years before CMS folds the cost into the packaged rate.
• Annual code updates: CMS adds, revises, and deletes C-codes every year through the OPPS final rule, published each November for a January 1 effective date.

C1722’s own pass-through window has been closed for more than two decades. CMS granted it transitional pass-through status from August 2000 through December 2002. Once that window closed, the device cost folded permanently into the associated procedure’s APC.

Some coders still ask about pass-through for this code, since that’s standard logic for newer C-codes. For C1722 specifically, don’t build a workflow around a separate device payment. Verify the current status indicator in the CMS OPPS Addendum B to confirm this for the current fiscal year.

Medicare coverage and reimbursement for HCPCS code C1722

Medicare covers C1722 when the single-chamber ICD is implanted for a covered indication. That falls under National Coverage Determination (NCD) 20.4, Implantable Automatic Defibrillators. NCD 20.4 splits coverage into two tracks. Primary prevention covers patients with poor cardiac function who haven’t yet had a life-threatening arrhythmia. Secondary prevention covers patients who already survived one.

That distinction matters for documentation, not just clinical planning. Primary-prevention cases carry extra data-collection and enrollment requirements that secondary-prevention cases don’t. Billing staff need to know which track applies before the claim goes out.

Because C1722 carries no current standalone fee, hospitals shouldn’t expect the OPPS payment file to list a device-specific rate. The reimbursement shows up inside the APC assigned to the implant procedure. That’s often a device-intensive APC tied to CPT 33249 in recent years.

Confirm the exact APC and payment indicator in the current CMS OPPS Addendum B before building charge master entries. Assignments shift with each annual update.

Medicaid coverage varies by state. State programs aren’t required to mirror Medicare’s OPPS packaging approach. Medicare Advantage plans set their own prior authorization and documentation rules for ICD implantation. Those rules can be stricter than traditional Medicare’s NCD 20.4 criteria.

How to bill HCPCS code C1722

Billing C1722 correctly comes down to five steps: the right claim form, revenue code, units, companion procedure code, and NCCI check. Missing any one of these can mean an outright denial or a payment delay. Either way, it needs manual rework from your billing team.

1. Use the UB-04 form (CMS-1450). C1722 is a facility-only code. CMS does not accept C-codes on the CMS-1500 professional claim form.
2. Report C1722 on its own revenue code line. Place the code in FL 44 (HCPCS/rate) next to revenue code 0278 in FL 42.
3. Bill one unit per device. A single-chamber ICD implant is one unit. Billing more than one unit on the same encounter is a common OIG audit flag.
4. Attach the implant procedure code. C1722 must appear on the same claim as the CPT code for the implant itself. Use 33240 for a generator-only replacement with an existing single lead, or 33249 for a full new system with transvenous leads.
5. Check NCCI edits. Review the current quarterly National Correct Coding Initiative table to confirm C1722 isn’t bundled with the procedure code in a way that needs a modifier to override.

Revenue codes used with C1722

C1722 has one clear-cut correct revenue code. But it sits close to a code that’s easy to grab out of habit.

Your charge description master should map C1722 to 0278. If it maps to anything else, flag it for review with your Medicare Administrative Contractor (MAC) before the next claim goes out.

Modifiers for HCPCS code C1722

Modifiers come up less often on C1722 claims than on professional-side CPT codes. Still, a couple of scenarios are worth building into your charge master logic.

Documentation requirements for HCPCS code C1722

Clean documentation keeps a C1722 claim out of the audit pile. Five things need to show up in the record before the charge goes out.

• Operative or implant log: confirms a single-chamber device was implanted, not a dual-chamber unit or a different device category, including the laterality of the implant.
• Device serial and lot number: captured for the charge master, recall tracking, and manufacturer warranty purposes.
• Medical necessity documentation: links the implant to a covered NCD 20.4 indication, primary or secondary prevention. Include the supporting clinical findings, such as ejection fraction, arrhythmia history, or a prior cardiac arrest.
• Correct diagnosis code: the arrhythmia or cardiac arrest diagnosis that drove the implant, not the presence-of-device code used at later follow-up visits.
• Physician order: supports the decision to implant, kept separate from the operative note itself.

That same serial-and-lot discipline applies wherever implants carry recall risk. Breast implants tracked by plastic surgery practices and joint hardware logged by sports medicine clinics follow the same logic.

The third and fourth items trip up more claims than anything else on this code. An implant claim needs the diagnosis that justified the device, something like ventricular tachycardia or a documented cardiac arrest. A general reference to arrhythmia risk isn’t enough.

Prior authorization considerations for C1722

Standard Medicare fee-for-service doesn’t require a separate prior authorization for C1722 itself. Still, NCD 20.4’s primary-prevention data-collection requirement functions similarly in practice. Three other situations should prompt a prior authorization check before the implant date.

• Medicare Advantage plans: MA organizations set their own prior authorization rules for ICD implantation, which can differ from traditional Medicare’s NCD 20.4 criteria. Confirm authorization before scheduling.
• Commercial payers: most commercial insurers require prior authorization for defibrillator implants. C1722 typically falls inside that authorization scope as the device used during the covered procedure.
• Medicaid managed care: state Medicaid managed care organizations often add prior authorization requirements beyond fee-for-service Medicaid policy.

Teams managing HIPAA compliance for medical offices that handle cardiac device implants should include prior authorization tracking. Make it part of the pre-service workflow. A missing authorization on the implant procedure code usually drags every device code on that claim into the same denial. C1722 is no exception.

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Pabau helps facility revenue cycle teams track device codes like C1722, flag revenue code mismatches, and manage claim submission in one place. See how practices are reducing denials and speeding up reimbursement.

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Common billing errors and how to avoid them

HCPCS code C1722 generates a predictable set of claim errors. Most of them follow patterns that a well-configured practice management platform or revenue cycle workflow can catch before submission.

The units mismatch and diagnosis mismatch errors draw the most attention at audit. Matching the device charge to the implant log is one high-value check. Matching the diagnosis to the clinical indication is the other, and both belong in pre-submission review.

Related C-series cardiac device codes

C1722 sits inside a small, specific family of cardiac rhythm device codes. Nearby C-codes cover different chamber counts and different device components entirely. Mixing them up is an easy way to end up with a rejected claim.

The generator and the lead are always two different charge lines. If the operative note describes both a new device and a new lead, both codes belong on the claim.

ICD-10 diagnosis codes commonly paired with C1722

C1722 needs at least one ICD-10-CM diagnosis code that supports medical necessity for the implant. That code has to reflect why the device went in, not just that one now exists.

That last row is the one to watch. Z95.810 describes a patient who already has the device. Using it as the sole diagnosis on the implant claim is circular, since the device can’t be its own justification. Sequence the arrhythmia or cardiac arrest diagnosis first, and save Z95.810 for the follow-up visits that come after.

Conclusion

HCPCS code C1722 is a narrow, specific code: one device, one chamber, one revenue code, billed alongside one procedure code. Most of the risk on this claim comes from confusing it with a neighboring C-code. Other common trip-ups include missing the arrhythmia diagnosis that justifies the implant. Another is assuming a pass-through payment that expired more than two decades ago.

Pabau’s claims management software helps facility billing teams build these checks directly into their workflow. Revenue code mapping and diagnosis pairing happen automatically, so C-code claims go out clean the first time. To see how it fits your revenue cycle operation, book a demo.

Continue your research

Need the full picture of a related OPPS device C-code? HCPCS code C1725 covers a different OPPS device C-code, for angioplasty catheters, but shares the same UB-04 device-billing mechanics.

Coding a different heart rhythm diagnosis? ICD-10 code I44.0 covers first-degree AV block, a conduction diagnosis billing teams see alongside cardiac device claims.

Need a code for a heart condition tied to another diagnosis? ICD-10 code I52 covers heart disorders classified elsewhere, another code cardiology coders reach for often.

Documenting a different cardiovascular diagnosis? ICD-10 code I71.9 covers aortic aneurysm without rupture, a separate but commonly audited vascular diagnosis.

Frequently asked questions