HCPCS code C1716 – Non-stranded gold-198 brachytherapy source

Key takeaways

HCPCS Code C1716 reports one non-stranded gold-198 brachytherapy source, billed per source implanted.

The isotope separates C1716 from C1717, which covers high dose rate iridium-192 sources. Both codes are non-stranded.

Stranded sources never go on C1716. They take an isotope-specific stranded code, or C2698 when no specific code exists.

Hospital outpatient departments report C1716 on the UB-04, with units equal to the gold-198 sources in the operative report.

Brachytherapy sources are paid separately under OPPS, so confirm the status indicator and rate in the current Addendum B.

HCPCS Code C1716: Definition and clinical context

HCPCS Code C1716 is a Level II C-code from the Centers for Medicare and Medicaid Services (CMS) for one non-stranded gold-198 brachytherapy source. Hospital outpatient departments report it under the Outpatient Prospective Payment System (OPPS), one unit per source implanted.

Brachytherapy places radioactive sources directly in or next to a tumor. Gold-198 has a half-life of about 2.7 days, so it delivers its dose quickly and is used for permanent interstitial implants. The sources are placed individually, which is why the descriptor reads “non-stranded”.

The coding decision for C1716 turns on two facts in the operative report: the isotope and the source configuration. Gold-198 points to C1716. A different isotope, or sources linked in a strand, points to a different code entirely.

Official code descriptor and key attributes

The table below sets out the official CMS descriptor and the core billing attributes for HCPCS Code C1716. Confirm the code’s status each year in the CMS HCPCS quarterly update and the OPPS addenda.

What C1716 covers — and what it does not

HCPCS Code C1716 covers the gold-198 sources themselves, implanted individually during a hospital outpatient procedure. Each source counts as one unit. The code does not cover the implant procedure, imaging guidance, or treatment planning.

Included under C1716:

• Non-stranded gold-198 sources (seeds or grains) implanted during the encounter
• Each individual gold-198 source, with the claim quantity matching the count in the operative report

Not covered by C1716:

• High dose rate iridium-192 sources, which use C1717
• Non-high dose rate iridium-192 sources, which use C1719
• Stranded sources of any isotope, such as stranded iodine-125 (C2638) or a stranded source with no specific code (C2698)
• The implant procedure itself, reported with the applicable CPT code
• Imaging guidance used during the implant
• Non-radioactive gold fiducial markers, which are tissue markers and not gold-198 sources

C1716 vs C1717: Key differences coders must know

The isotope separates C1716 from C1717. C1716 reports gold-198, while C1717 reports a high dose rate (HDR) iridium-192 source. Both descriptors say “non-stranded”, so the strand question never decides between these two codes.

When the operative report says only “brachytherapy seeds”, without naming the isotope, query the physician before you code. Payers match the code to the isotope in the record, so a guess can turn into a denial or a recoupment.

Related brachytherapy source codes

C1716 sits in a family of per-source C-codes split by isotope and by configuration, all listed in our HCPCS procedure codes library. The codes below are the ones most often confused with it.

C2616 is also non-stranded and covers yttrium-90, so it never applies to a stranded source either. For stranded sources, CMS asks hospitals to bill one unit for each source in the strand, not one unit per strand. The diagram below puts both coding questions in the order a coder should ask them.

The procedure goes on its own line with a CPT code. For a permanent interstitial implant, that is usually 77778 for complex interstitial source application. HDR treatment delivered with C1717 uses the remote afterloading codes 77770–77772 instead.

Billing requirements: Where and how to use HCPCS Code C1716

HCPCS Code C1716 is billed on a UB-04 (CMS-1450) facility claim from a hospital outpatient department. Four requirements must be met before the claim leaves the facility. For the basics behind any facility claim, see our guide to medical billing fundamentals.

1. Billing setting: The implant must take place in a hospital outpatient department paid under OPPS. Physician offices bill on the CMS-1500 and do not report C1716. An ambulatory surgery center follows separate ASC rules, so check its own payment file.
2. Claim form: File on the UB-04 with the revenue code your Medicare Administrative Contractor (MAC) requires for the line. Revenue code 0333 (radiation therapy) is often paired with brachytherapy, but MAC instructions vary.
3. Quantity: Report one unit per gold-198 source implanted. If 20 sources were placed, the quantity field shows 20. A mismatch between the claim and the operative report is a routine audit trigger.
4. Diagnosis code: Pair C1716 with an ICD-10-CM code that supports medical necessity for the brachytherapy, usually a malignant neoplasm code for the treated site.

A clean claim submission for C1716 needs all four elements right before it reaches the clearinghouse. Missing any one of them creates a preventable denial.

OPPS payment status for C1716

Brachytherapy sources are paid separately under OPPS rather than packaged into the procedure’s payment. CMS pays them under the standard OPPS methodology, using source-specific costs. The hospital is paid per source, on top of the implant procedure.

That differs from transitional pass-through devices, which have their own status indicator and payment path. Check C1716’s own row in the current Addendum B to confirm its status indicator.

Practical check: Search the current year’s CMS OPPS Addendum B for C1716, then read the status indicator, the APC, and the payment rate. Rates change with each annual OPPS final rule, so never carry last year’s figure forward.

Documentation requirements for C1716 claims

Every C1716 claim rests on a record that names the isotope and counts the sources. Payers review the operative report at post-payment audit, and a mismatch between the bill and the record usually ends in a recoupment demand. Medical billing compliance standards expect that record to be complete before the claim goes out.

The minimum documentation checklist for HCPCS Code C1716:

• Operative or procedure report: Names gold-198 as the isotope and records the exact number of sources implanted. A generic “brachytherapy seeds” triggers a physician query, never an assumption.
• Source configuration: Confirms the sources were placed individually. If the report describes a strand, C1716 is the wrong code.
• Physician order and treatment plan: A signed order from the radiation oncologist that specifies the isotope and the planned number of sources.
• Pathology and diagnosis: Histological confirmation of the malignancy, supporting the ICD-10-CM code on the claim.
• Medical necessity statement: Notes on why brachytherapy suits this patient’s diagnosis and stage, for payers that run medical necessity reviews.
• Quantity reconciliation: The count in the operative report equals the quantity billed. Many facilities keep a source tracking log as a second check.

Common claim denial reasons for HCPCS Code C1716

C1716 claims face a predictable set of denial triggers, and most of them can be prevented with a pre-submission check. Pabau, the practice management and billing platform we build, keeps the procedure record next to the claim so coders can check both. Strong denial management workflows matter for any facility that bills oncology devices regularly.

The table below maps each common denial to its root cause and the fix.

Payer coverage policies and prior authorization

Medicare covers brachytherapy for medically necessary oncology indications, and pays for C1716 sources separately under OPPS. No national coverage determination (NCD) broadly restricts brachytherapy. Instead, Medicare contractors such as Noridian Healthcare Solutions issue local coverage determinations (LCDs) that set covered diagnoses and documentation expectations.

Medicaid coverage for HCPCS Code C1716 varies by state. Some programs follow OPPS policy, while others use their own fee schedules or require prior authorization for implants. Always complete insurance eligibility verification and check prior authorization rules before the procedure date.

Commercial payers follow their own coverage policies, which may differ from Medicare’s. Key points for commercial claims:

• Many commercial plans require prior authorization for brachytherapy, so confirm with the plan before scheduling
• Some commercial payers map C-codes to their own device reimbursement schedules rather than OPPS rates
• Coverage can be restricted by isotope, so check whether the plan’s oncology policy names gold-198
• Appeals should cite the treating physician’s clinical rationale and any clinical society guidelines that support brachytherapy for the diagnosis

How Pabau keeps C1716 claims ready for billing

Billing teams often rebuild a C1716 claim by hand. They read the isotope off the operative note, count sources against the packing slip, and type the units into the claim line.

Pabau keeps the treatment record, inventory log, and claims management software in one system. The source count recorded at the procedure carries through to the claim your team builds. Your team then sees a quantity mismatch before submission, while it is still a quick correction.

The result is fewer resubmissions for wrong units or wrong codes, and a record that already answers the auditor’s questions.

Streamline your outpatient device billing

Pabau’s claims management software supports per-unit quantity tracking and outpatient facility billing, so your team catches C1716 errors before they reach the payer.

Book a demo

Conclusion

The safest C1716 claim is built from the operative report outward. When the report names gold-198, describes sources placed one by one, and gives a count, the code and the units follow on their own.

When any of those three is missing, query the physician before the claim is built. A short query costs minutes. A recoupment after audit costs the payment itself.

Make that check a fixed step before every brachytherapy claim leaves the facility. To see how Pabau puts the source count next to the claim line, book a demo.

Continue your research

Want to understand how HCPCS fits into the broader billing picture? What is revenue cycle management covers the end-to-end workflow from claim creation to payment posting.

Need guidance on handling denied outpatient device claims? Denial codes in medical billing explains the most common CARC codes and how to build an effective appeal.

Looking for a clean-claim checklist for facility billing? Superbill guide covers what belongs on a complete outpatient claim before it reaches the clearinghouse.

Coding an iridium-192 implant that is not high dose rate? HCPCS Code C1719 covers the non-HDR iridium-192 source that sits next to C1716 in the same code family.

Frequently asked questions