D6121 — Implant-supported retainer crown, full cast metal (predominantly base alloys)
One of the codes covering the retainer units of a bridge supported by implants rather than natural teeth. D6121 is the version in cast predominantly base-metal alloy.
There are 16 codes for implant-supported bridge retainer and they are not interchangeable. This page covers this one; the implant-supported bridge retainer guide covers the treatment they all share.
What follows is the detail behind the number: the conditions the code sets, its typical fee, its usual benefit treatment, and a code-by-code comparison with its closest neighbours.
What the code commits to
Material — cast predominantly base-metal alloy. A single casting in a base-metal alloy, most often cobalt-chromium. It is the hardest of the cast alloys, which cuts both ways: it resists wear almost indefinitely, but it also wears the opposing natural tooth and is difficult to adjust or remove once cemented. It is the least expensive cast option and, for a molar out of sight, a reasonable one. The material is part of the code rather than a choice made afterwards, so D6121 is only the right code if that is what was actually used.
Coverage — full. The restoration wraps the whole circumference of the tooth, which is what holds a cracked or heavily restored tooth together rather than simply filling it.
The nearby codes and how they differ
D6120 — Implant-supported retainer crown, PFM (titanium and titanium alloys): It specifies porcelain fired over a titanium core rather than cast predominantly base-metal alloy.
D6122 — Implant-supported retainer crown, full cast metal (noble alloys): It specifies cast noble alloy, with no porcelain over it rather than cast predominantly base-metal alloy.
D6123 — Implant-supported retainer crown, full cast metal (titanium and titanium alloys): It specifies titanium or a titanium alloy rather than cast predominantly base-metal alloy.
D6099 — Implant-supported retainer crown, PFM (noble alloys): It specifies porcelain fired over a noble-alloy core rather than cast predominantly base-metal alloy.
D6121 sits in a group of 16 codes in total; the remainder are linked at the foot of this page. The descriptions differ by a few words and the fees differ by a great deal, which is why mixing them up is one of the commonest billing errors in dentistry. Ask which of these codes is being submitted and why.
Every code in this group
These codes describe the same broad procedure and differ in one respect each. Each has its own page with its own fee range and coverage notes.
Questions about D6121
What is D6121 on my dental bill?
The procedure behind the number is implant-supported retainer crown, full cast metal, predominantly base alloys, filed under implant services.
How much does D6121 cost?
Typically $1,200–$2,800 before insurance, depending on local fees and the complexity of the individual case.
Is D6121 a covered benefit?
Most plans include it under major benefits, 0–50%. A pre-treatment estimate is the only way to know your own number in advance.
What is the difference between D6121 and D6120?
D6120 is implant-supported retainer crown, PFM, titanium and titanium alloys: it specifies porcelain fired over a titanium core rather than cast predominantly base-metal alloy. The rest of the procedure is the same, which is why the two get substituted for one another on estimates.
Also known as: implant bridge, implant retainer, implant supported FPD, multiple missing teeth.