D2643 — Porcelain onlay — three surfaces
An onlay is a lab-made or milled restoration that covers one or more cusps of a back tooth. D2643 is the three-surface version in porcelain.
There are nine codes for onlay and they are not interchangeable. This page covers this one; the onlay guide covers the treatment they all share.
The sections below cover the conditions built into the code, what it tends to cost, what a dental plan is likely to pay, and where the line falls between this code and the ones next to it.
Reading D2643
Extent — three surfaces. Three surfaces is the point at which a dentist starts weighing a filling against a crown or onlay, because the remaining tooth structure is thin enough to flex under load.
Material — porcelain. Porcelain is a fired dental ceramic, chosen because it reflects and transmits light much as enamel does and because it does not stain. It is harder than enamel, so it holds a polish for decades, and brittle, so it depends on the strength of the bond underneath it and on an even bite to avoid chipping. The material is part of the code rather than a choice made afterwards, so D2643 is only the right code if that is what was actually used.
The nearby codes and how they differ
D2642 — Porcelain onlay — two surfaces: It covers two surfaces instead of three surfaces.
D2644 — Porcelain onlay — four or more surfaces: It covers four or more surfaces instead of three surfaces.
D2662 — Composite onlay — two surfaces: It covers two surfaces instead of three surfaces.
D2663 — Composite onlay — three surfaces: It specifies tooth-coloured composite resin rather than porcelain.
D2643 sits in a group of nine codes in total; the remainder are linked at the foot of this page. Reviewers compare the narrative against the code rather than the other way round, so the question worth asking is what the notes will say.
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.
| Code | Procedure |
|---|---|
| D2643 | Porcelain onlay — three surfaces — this page |
| D2542 | Metallic onlay — two surfaces |
| D2543 | Metallic onlay — three surfaces |
| D2544 | Metallic onlay — four or more surfaces |
| D2642 | Porcelain onlay — two surfaces |
| D2644 | Porcelain onlay — four or more surfaces |
| D2662 | Composite onlay — two surfaces |
| D2663 | Composite onlay — three surfaces |
| D2664 | Composite onlay — four or more surfaces |
Questions about D2643
What procedure is D2643?
On a claim, D2643 tells the insurer that what was performed was porcelain onlay, three surfaces.
What should I expect to pay for D2643?
Most private fees fall in $1,310–$2,770. Geography accounts for more of that spread than anything clinical.
Does dental insurance cover D2643?
Yes on most policies, treated as major work at typically 50%. A waiting period on a new policy is the commonest reason it is not.
What is the difference between D2643 and D2642?
D2642 is porcelain onlay, two surfaces: it covers two surfaces instead of three surfaces. Because that is the only difference, a reviewer who disagrees with it simply reprices the claim to D2642 rather than refusing it.
Also known as: onlay, partial crown, cusp coverage, indirect restoration, cracked tooth restoration.