D6091 is the CDT code for replacing the replaceable part of a semi-precision or precision attachment on an implant/abutment-supported prosthesis, reported per attachment. It covers swapping worn attachment inserts — such as LOCATOR nylon males — that wear out with normal function.
Informational only — confirm the official CDT descriptor and your payers' rules independently. This is general guidance, not billing, coding, or clinical advice.
When to Use the D6091 Code
Report D6091 when the replaceable component of an attachment on an implant or abutment-supported prosthesis is changed out — for example, replacing the nylon inserts (males) in a LOCATOR-style overdenture attachment that have worn and reduced retention. It is billed per attachment, so multiple inserts replaced in one visit are reported per unit.
D6091 is not a re-cement (D6092/D6093) and not a repair of the prosthesis body (D6090). It is also distinct from maintenance (D6080). Use D6091 specifically when the worn, replaceable attachment part itself is being swapped — not when the prosthesis is recemented, repaired, or remade.
Documentation & Clinical Scenarios
Attachment-replacement claims should specify the units:
- Prosthesis and implant/abutment sites involved.
- The attachment type (semi-precision or precision; e.g., LOCATOR) and that the replaceable part was worn.
- How many attachments were serviced, since the code is per attachment.
- A note describing the worn retention and the parts replaced.
Replacing the attachment part is separate from re-cementing or repairing the prosthesis; if those are also performed, they carry their own codes (D6092/D6093 or D6090).
Insurance & Billing Tips
- Verify whether attachment-part replacement is a benefit — many plans treat it as routine maintenance.
- Report the correct number of units because D6091 is per attachment.
- Check frequency limits, since inserts wear periodically and plans may cap replacements.
- Don't conflate with re-cement or repair — D6092/D6093 and D6090 are different services.
- Document wear and reduced retention to support medical necessity.
Example Case
A 70-year-old patient with an implant-retained lower overdenture reports the denture feels loose. The dentist finds the two LOCATOR nylon inserts are worn and replaces both replaceable parts, restoring retention. The prosthesis itself is intact, so no repair or re-cement is needed. The office verifies the plan's attachment-replacement benefit and frequency limit, then files D6091 x2 (one per attachment) with a note describing the worn inserts — and the claim is processed correctly because the units and the service were clearly documented.
Patients call because "my implant denture feels loose" or "it doesn't snap in anymore" — not D6091. DentalReception AI answers those calls 24/7, books the adjustment visit live into your schedule, and captures insurance details, while clinical and coverage questions route to your team. See how it handles denture repair calls, or book a demo.
Frequently Asked Questions
What's the difference between D6091 and D6090?
Service type. D6091 replaces the replaceable part of an attachment (like a worn LOCATOR insert), reported per attachment, while D6090 is a repair of the implant-supported prosthesis itself, such as a fractured framework or chipped porcelain. Swapping a worn attachment insert is D6091; fixing a broken prosthesis component is D6090.
Is D6091 billed per attachment or per visit?
Per attachment. If two inserts are replaced in one appointment, report D6091 twice (one unit per attachment). Document how many attachments were serviced so the units on the claim match the work performed and the payer can adjudicate each correctly.
Will insurance cover attachment-part replacement?
It varies. Many plans treat worn inserts as routine maintenance and may cover replacement subject to a frequency limit, while others exclude it. Verify the benefit and any frequency cap before the visit, and document the worn retention, so the patient knows what to expect.
Do I need a pre-authorization for D6091?
A pre-estimate can help because coverage and frequency rules for attachment parts differ between plans. Confirming the benefit and the per-attachment frequency limit ahead of time, and noting the worn inserts and reduced retention, lets you bill the right number of units and quote an accurate out-of-pocket amount.
Confirm the current CDT descriptor and your specific payer policies before billing — browse the full dental code library or see our insurance verification feature.