HCPCS code C1789: Implantable breast prosthesis billing guide

Key takeaways

HCPCS code C1789 is the CMS descriptor for a prosthesis, breast (implantable). It names one specific device.

The not otherwise classified device code is C1889, not C1789. The two get mixed up constantly.

Hospital outpatient departments report C1789 on the UB-04. Payment is packaged into the procedure APC, so the line draws no separate dollars.

Medicare pays for reconstruction after mastectomy, not for cosmetic augmentation. The operative note has to make that difference clear.

Practice management software like Pabau helps facilities capture implant details, link diagnoses, and keep audit-ready records for C-code claims.

HCPCS code C1789 is the CMS Level II device code for a prosthesis, breast (implantable). A hospital outpatient department reports it on the UB-04 when it implants a breast prosthesis. The operating surgeon bills the procedure separately on a CMS-1500.

One clarification belongs up front, because it drives most of the confusion around this code. C1789 is a specific device code. It is not the not otherwise classified code for implants, which is C1889.

This reference covers the descriptor, how OPPS pays for the device, and the ICD-10-CM crosswalk. It also covers the companion CPT codes and the denials that hit breast implant claims hardest.

HCPCS code C1789: Definition and descriptor

HCPCS code C1789 is the official CMS designation for a prosthesis, breast (implantable). It belongs to HCPCS Level II, the alphanumeric code set maintained by the Centers for Medicare and Medicaid Services (CMS). Level II covers devices, supplies, and items that CPT codes do not describe.

The January 2026 HCPCS Level II file still lists C1789 as an active code with no termination date. It sits in the assorted devices, implants, and systems range, C1760 through C2615.

C-codes identify devices used in the hospital outpatient department (HOPD). The code covers the implant itself, and the facility reports it on the UB-04 institutional claim. Physicians never bill C1789 on a CMS-1500.

The word implantable is what narrows the code. C1789 describes a prosthesis placed inside the body during surgery. An external breast form worn in a bra is a different benefit with its own L-codes.

C1789 vs C1889, L8600, and L8039: Picking the right code

Published coding references sometimes describe C1789 as a catch-all for prosthetic implants. That reading is wrong, and it produces claims that misstate what the hospital implanted.

The not otherwise classified (NOC) device code is C1889, implantable/insertable device, not otherwise classified. Chapter 4 of the CMS Claims Processing Manual covers this. It tells hospitals to report C1889 when a procedure needs a device that no specific HCPCS code describes. C1789 describes exactly one thing.

Two of those codes cause almost all of the trouble. L8699 carries the words that get pinned on C1789 by mistake. C1889 is the code people reach for when they think C1789 is a catch-all.

The distinction shows up at audit. Reporting C1789 for a device that is not a breast prosthesis misdescribes the surgery. Reporting C1889 for a breast implant hides a coded device behind a NOC line. Neither survives a chart review.

External breast forms sit outside this group entirely. Those are L8020 for a mastectomy form and L8030 for a silicone form worn against the chest wall.

How Medicare reimburses the implant under OPPS

C1789 draws no separate Medicare payment. The cost of the implant is packaged into the Ambulatory Payment Classification (APC) rate for the procedure it supports. The device line pays nothing on its own.

Status indicator and pass-through history

C1789 held device pass-through status from October 1, 2000 to December 31, 2002. The CMS device category list records it as entry 94, with those exact dates.

Pass-through payment is time-limited by statute to between two and three years. Once it expires, CMS assigns the device code status indicator N for packaged payment. C1789 has been packaged since the start of 2003.

Why a packaged code still has to be on the claim

It has to be there because the claim will not pay without it. A line that pays nothing looks droppable, and some teams drop it. That costs them the whole claim.

The outpatient code editor returns any claim that reports a device-intensive procedure without at least one device HCPCS code on it. The claim comes back unpaid, and someone has to rework it. CMS publishes the device-intensive procedure list with the annual OPPS addenda.

There are narrow exceptions. Modifiers 52, 73, and 74 exempt an interrupted procedure where no device went in. Modifier CG bypasses the edit on certain device-intensive procedures when nothing was implanted.

The charge on that line matters too. CMS builds future APC rates from submitted claims data. Under-reporting the implant charge this year pushes down the payment for breast reconstruction in a later year.

ICD-10-CM codes that support medical necessity

Every C1789 claim needs a diagnosis that explains why an implant went in. For breast prostheses, that means a code showing the breast was removed, is being removed, or was never fully formed.

The diagnosis usually comes from the referring oncology or women’s health practice, so take it from their record rather than the referral letter. The codes below are the ones that come up most.

The T85 codes need a placeholder X and then a seventh character for the encounter. Capsular contracture at the initial encounter is T85.44XA, and the same complication at a follow-up visit is T85.44XD.

Z98.82, breast implant status, is worth knowing as a secondary code. It records that an implant is in place, which helps a reviewer follow the history on a revision claim.

Billing guidelines for implantable breast prosthesis claims

C1789 is a facility device code, so correct submission comes down to the claim form, the revenue code, the units, and the diagnosis link. Check each point against your Medicare Administrative Contractor (MAC) instructions before you submit.

• Claim form: UB-04 (Form CMS-1450) on bill type 12X or 13X, not the CMS-1500 the surgeon uses.
• Revenue code: Report the C1789 line under a revenue code that identifies an implant. Most facilities use 0278 for other implants, and some MACs direct 0274 for prosthetic devices. Confirm the pairing locally.
• Who bills: The facility. The surgeon bills the reconstruction CPT code separately.
• Units: Report one unit per implant. A bilateral case involves two implants, so the units field says two.
• Device details: Record the manufacturer, model, size, and unique device identifier (UDI) in the operative report. Reviewers ask for it.
• Diagnosis link: Link the covered ICD-10-CM diagnosis to the claim. An unlinked diagnosis is a routine denial trigger.
• Charge accuracy: Report the real acquisition charge, even though the line is packaged. That figure feeds future rate-setting.

Facilities using claims management software can set an edit that flags a reconstruction claim with no device line on it. Catching that before submission removes a whole class of returned claims.

CPT procedure codes reported alongside C1789

C1789 reports the implant. The surgery itself is captured by a companion CPT code that the surgeon bills. Verify descriptors against the AMA CPT code set each January.

Modifiers and laterality rules

Breasts are paired organs, so laterality rules apply and they are stricter than most coders expect. Chapter 4 of the CMS Claims Processing Manual sets them out.

• -LT and -RT: Use these whenever the procedure is performed on one side only. They tell the payer which breast was operated on.
• -50: Use it for a bilateral procedure performed at the same operative session. Report one line with one unit of service.
• Never both: CMS says not to report RT and LT when modifier 50 applies. Two lines for a bilateral case is the wrong shape.
• -52, -73, -74: Interrupted or reduced procedures. These exempt the claim from the device edit when no implant went in.
• -CG: The bypass modifier for certain device-intensive procedures where nothing was implanted.
• -GA, -GY, -GZ: Liability and non-coverage modifiers. They matter most on the cosmetic side, covered in the next section.

Most laterality denials are mechanical rather than clinical. The claim says one side and the operative note says the other, or a bilateral case arrives as two lines instead of one.

Reconstructive or cosmetic: Where coverage stops

Medicare covers a breast prosthesis that restores a breast after mastectomy. It does not cover cosmetic augmentation, and no amount of documentation changes that.

Chapter 16 of the Medicare Benefit Policy Manual defines cosmetic surgery as any surgical procedure directed at improving appearance. The exclusion lifts in two situations. One is prompt repair of accidental injury. The other is improving the function of a malformed body member.

That second clause is what carries a congenital case such as Q83.0. It is also why the operative note has to describe what the surgery restores, rather than how the result looks.

Commercial claims run on a different standard. The Women’s Health and Cancer Rights Act of 1998, known as WHCRA, controls there. It requires group health plans that cover mastectomy to also cover reconstruction and prostheses. WHCRA does not apply to Medicare or Medicaid.

That distinction trips up appeal letters. Citing WHCRA to a MAC gets you nowhere, because Medicare coverage rests on medical necessity and the prosthetic device benefit instead. Save the WHCRA argument for the commercial payers it actually binds.

When a patient asks for an augmentation that Medicare will not cover, issue an Advance Beneficiary Notice (ABN) before surgery. Then report the claim with the modifier that matches the situation, GA or GY. A plastic surgery practice running both reconstruction and cosmetic cases needs that split built into its consent workflow.

Documentation requirements for C1789 claims

The record has to answer two questions. Which breast, and why an implant. Facilities that manage medical forms across several sites should capture these in a fixed workflow rather than collect them case by case.

• Physician order: A signed order for the reconstruction or implant exchange, naming the side.
• Operative report: The procedure performed, the laterality, and the implant manufacturer, model, size, and UDI.
• Clinical history: The mastectomy record, the pathology report, or the congenital diagnosis that explains the absent breast tissue.
• Reconstructive intent: A note stating what the surgery restores. This is the line between a covered claim and a cosmetic one.
• Diagnosis linkage: The ICD-10-CM codes documented in the chart and linked on the UB-04.
• Device charge record: The invoice or acquisition cost behind the charge on the C1789 line.
• ABN: A signed notice when any part of the service may be denied as cosmetic.

Structured digital forms keep every one of these in the same place each time. Free-text notes leave it to memory, and reviewers tend to find the result incomplete.

Common denials on breast implant device claims

Breast implant claims fail in a small number of predictable ways. Each one has a fix that lives in the workflow rather than in the appeal letter.

• C1789 used as a catch-all: Reporting it for a device that is not a breast prosthesis misdescribes the surgery. Use C1889 when no specific code fits.
• C1889 used for a breast implant: The opposite error. A specific code exists, so a NOC line invites a review the facility will lose.
• Laterality mismatch: The diagnosis, the modifier, and the operative note disagree. Read all three before submission.
• Missing device line: A device-intensive procedure with no device code comes back to the provider unpaid.
• Cosmetic intent in the record: Language about appearance, with no reconstructive purpose stated, turns a covered claim into a non-covered one.
• Zero or nominal device charge: The line pays nothing today, so the charge gets left blank. It still shapes tomorrow’s APC rate.

Warranty and recall replacements: Report value code FD

Report value code FD when a manufacturer credit covers part of the replacement implant. Breast implants get replaced under warranty and after recalls more often than most implanted devices. The removal of the old implant carries its own procedure code, CPT code 19328.

Modifiers FB and FC used to carry this on OPPS claims. Effective January 1, 2014, hospital outpatient departments report value code FD instead. Use it when the manufacturer credit is 50 percent or more of the device cost. Put the credit amount in the value code’s amount field.

One exception survives. Modifier FB is still required on ambulatory surgery center claims, so a facility running both settings has to handle each one differently.

How Pabau supports implantable device billing and documentation

Most breast implant denials trace back to the documentation trail rather than the coding decision. The side was in the operative note but not on the claim. The implant model went into a paper log the coder never opened.

Practice management software like Pabau gives outpatient teams one place to connect the clinical record, the coding, and the claim. The capabilities that matter for C1789 look like this.

• Structured documentation capture: Operative templates record laterality, implant model, size, and UDI as required fields. That data reaches billing instead of sitting in a separate file.
• Diagnosis and modifier prompts: Claim edits flag a device line with no linked diagnosis, or a laterality modifier that disagrees with the diagnosis code.
• Audit trail: Every form entry and sign-off is timestamped, so a post-payment review meets a defensible record rather than a reconstruction.
• Multi-site consistency: Programs running several locations can hold one documentation standard, so claims look the same wherever the surgery happened.

The outcome is narrow and worth having. Fewer returned claims, fewer laterality corrections, and a record that answers a reviewer without a scramble. Teams mapping their practice management software features can start with the operative template, and EHR integration keeps the chart and the claim in step.

Stop losing device claims to missing details

Pabau's claims management and digital forms capture implant model, size, laterality, and UDI as required fields. Breast reconstruction claims go out complete the first time.

Book a demo

Conclusion

C1789 is a one-line descriptor that gets misread constantly. It means a breast prosthesis, implantable, and nothing wider than that. The catch-all code you may be reaching for is C1889.

Get that straight and the rest of the claim falls into place. Confirm the implant from the operative report, then let the laterality modifier and the linked diagnosis follow it.

The line pays nothing, which is exactly why it gets treated carelessly. It still decides whether the claim clears the device edit, and the charge on it still shapes what breast reconstruction pays in a later year.

Structured documentation is what turns a correct code into a paid claim. Book a demo to see how implant documentation and claim submission run in one place.

Continue your research

Need the code C1789 is often confused with? C1889 is the real not otherwise classified device code, and it explains when a NOC line is the right call.

Coding the mastectomy that came first? CPT code 19305 covers radical mastectomy billing, modifiers, and reimbursement.

Starting with a tissue expander? CPT code 19357 walks through expander placement and the expansions that follow it.

Reporting another packaged implant code? C1785 shows how the same UB-04 rules work for a cardiac device.

Coding breast imaging as well as surgery? G0279 explains tomosynthesis claims and the pairing rules that decide payment.

Frequently asked questions