D2161 — Amalgam filling — four or more surfaces
Amalgam is the silver-grey filling material that generations of dentists used as the default for back teeth. D2161 is the four-or-more-surface version.
It is one of four codes covering amalgam restoration. For the procedure itself rather than the code, see the amalgam restoration guide; for the code, read on.
What the code requires, what it costs, how it is paid, and how to tell it from its neighbours — each in its own section below.
What D2161 specifies
Extent — four or more surfaces. At four surfaces or more the restoration effectively replaces the crown of the tooth while still relying on bonding or mechanical grip rather than wrapping the tooth. Many dentists will recommend an onlay or crown at this size instead.
Material — silver-grey amalgam. Amalgam is an alloy of silver, tin and copper bound with mercury, mixed at the chairside and packed into the cavity, where it sets hard. It is not bonded to the tooth — it is held by the shape of the preparation — which is why amalgam cavities are cut with slightly undercut walls and take a little more healthy tooth with them. In exchange it tolerates moisture, costs less than anything else, and routinely lasts two decades under heavy load. The material is part of the code rather than a choice made afterwards, so D2161 is only the right code if that is what was actually used.
Not to be confused with
D2160 — Amalgam filling — three surfaces: It covers three surfaces instead of four or more surfaces.
D2150 — Amalgam filling — two surfaces: It covers two surfaces instead of four or more surfaces.
D2140 — Amalgam filling — one surface (silver filling): It covers a single surface instead of four or more surfaces.
Those three codes and D2161 are the whole group — nothing else describes this procedure. There is no penalty for asking which of these is planned, and there is a real cost to finding out from an explanation of benefits weeks later.
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 |
|---|---|
| D2161 | Amalgam filling — four or more surfaces — this page |
| D2140 | Amalgam filling — one surface (silver filling) |
| D2150 | Amalgam filling — two surfaces |
| D2160 | Amalgam filling — three surfaces |
Questions about D2161
What procedure is D2161?
The procedure behind the number is amalgam filling, four or more surfaces, filed under restorative.
What is the typical fee for D2161?
Most private fees fall in $210–$550. Geography accounts for more of that spread than anything clinical.
How do dental plans handle D2161?
Yes on most policies, treated as basic work at typically 70–80% after deductible. A waiting period on a new policy is the commonest reason it is not.
What is the difference between D2161 and D2160?
D2160 is amalgam filling, three surfaces: it covers three surfaces instead of four or more surfaces. Apart from that, the two describe the same treatment — which is why the notes for the visit matter more here than the code itself.
Also known as: silver filling, amalgam, metal filling, back tooth filling.