D6055 is the CDT code for a connecting bar that spans across two or more implants or abutments to retain a removable implant-supported prosthesis. The bar clips or locks an overdenture in place. Billed once per arch, not per implant.
Last updated June 2026 ยท Reviewed by the PracticeAlpha billing team
Get help with D6055 claims →Use D6055 when a custom connecting bar is fabricated to span across two or more implant fixtures or abutments in the same arch. The bar is designed to retain a removable implant-supported overdenture. It provides a rigid connection point that the prosthesis clips or snaps onto. Bill once per bar per arch.
Scenario 1 - Mandibular overdenture on two implants: Two implants placed in the lower anterior jaw. A connecting bar spans between them. An overdenture attaches to the bar with clip or ball attachments. Bill D6055 once for the bar and D6010 for each implant body during the surgical phase.
Scenario 2 - Maxillary full-arch implant overdenture: Four or more implants in the upper arch connected by a single milled bar. The upper overdenture clips onto the bar for retention. D6055 covers the bar fabrication. Separate codes cover implant placement and the prosthesis itself.
Scenario 3 - Existing abutment-retained bar: A bar supported not by implant bodies directly but by abutment components. Still coded D6055 per the CDT descriptor "implant or abutment supported."
Do NOT use D6055 for: Fixed implant bridges or full-arch fixed prosthetics (different prosthetic category). Abutments themselves (use D6056 or D6057). Implant bodies (use D6010). Removable partial dentures on natural teeth only.
Many dental plans exclude all implant-related codes outright. If the patient's plan has an implant exclusion, D6055 will be denied regardless of documentation or pre-auth. Verify benefits before treatment. If implants are excluded, the patient should understand they are responsible for the full cost of all implant prosthetic components including the connecting bar.
Plans that do cover implants almost always require pre-authorization for major prosthetic work. Submit pre-auth with a full-arch radiograph showing implant positions, a treatment plan narrative, and the lab prescription. D6055 is a high-cost component and payers want to review it before authorizing payment.
The claim must clearly document how many implants exist and where they are located. Payers need to confirm the bar is supported by implants, not natural teeth. Include a current panoramic radiograph, the dates of implant placement, and the claim should reflect all associated codes together as a coordinated prosthetic plan.
D6055 is sometimes denied when billed without the associated prosthetic codes in the same claim series. The payer may require D6010 (implant body) on record before approving a prosthetic component code. If the surgical phase was done years ago at a different practice, include a narrative and any available records proving the implants are in place.
Panoramic or full-series periapicals showing the location, number, and condition of all supporting implants. The radiograph should be current enough to demonstrate implant integration and absence of pathology.
Document the type of prosthesis being retained (overdenture, clip-retained, etc.), the number of implants involved, and why a connecting bar was chosen over individual attachments. Note the arch (maxillary or mandibular).
The lab slip or digital work order for the bar should confirm the material (milled titanium, cast metal, etc.) and design. Payers may request lab documentation when auditing high-cost prosthetic claims.
If the plan requires pre-auth for implant prosthetics, obtain it before delivering the case. Document the pre-auth number on the claim. Claims submitted without a required pre-auth number will be denied and appeals are difficult.
If the implants were placed by a different provider or at a prior practice, include a narrative with the implant dates, implant system, and referring provider. This establishes that the bar is implant-supported as coded.
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Learn about our billing servicesD6055 is the CDT code for a connecting bar supported by implants or abutments. The bar spans across two or more implant fixtures in an arch and retains a removable overdenture or implant-supported prosthesis using clips or attachments.
Bill D6055 when a connecting bar is fabricated to span across two or more implants or abutments to retain a removable prosthesis. Bill once per bar per arch, not per implant. Include the arch designation on the claim form.
Coverage varies widely. Many plans exclude all implant-related codes. Those that do include implants typically require pre-authorization and classify D6055 as a major prosthetic benefit with the highest cost-share tier. Always verify benefits before treatment.
D6055 is the connecting bar that links multiple implants to retain a removable prosthesis. D6056 is a prefabricated abutment that connects a single implant body to a crown or other prosthetic component. These are different components in an implant prosthetic system.
Common reasons: blanket implant exclusions, missing pre-authorization, insufficient radiographic documentation, code sequencing errors when the surgical phase was at a different practice, and frequency limitations on major prosthetic replacements.
Once per connecting bar per arch. A single bar spanning four implants in the mandible is still one D6055. If both arches have connecting bars, each is billed separately with the appropriate arch designation.
Search all CDT codes in our dental coding guide.