What D7485 means

D7485 covers the surgical reduction of an osseous tuberosity. "D" is dental, "74" is this oral surgery group, and "85" is this tuberosity reduction. A tuberosity is a rounded bony prominence; in the mouth, the relevant one is typically the maxillary tuberosity — the bony prominence at the back of the upper jaw (the posterior end of the upper alveolar ridge, behind the last upper molar). An osseous (bony) tuberosity that is enlarged (excessively large bony prominence) can cause problems — particularly interfering with an upper denture. D7485 is for the surgical reduction of such an enlarged osseous tuberosity — surgically removing/reshaping the excess bone to reduce the tuberosity to a suitable size/contour. So when an enlarged bony tuberosity (usually the maxillary tuberosity) needs reducing (e.g., to allow a denture to fit), D7485 reports it.

So it's surgically reducing an enlarged bony prominence at the back of the upper jaw (the maxillary tuberosity), typically to allow a denture to fit.

An enlarged maxillary tuberosity can interfere with an upper denture — if the tuberosity is too large (bulbous, or hanging down too far), it can prevent the denture from seating properly, reduce the space for the denture, or compromise its fit. Reducing the tuberosity (D7485) creates a suitable contour/space for the denture. This is a pre-prosthetic surgical procedure (preparing the mouth for a denture). The reduction is of the bony (osseous) tuberosity — distinct from reducing excess soft tissue (a fibrous tuberosity, which is soft tissue, would be addressed differently, e.g., D7972 surgical reduction of fibrous tuberosity). D7485 is specifically the osseous (bony) reduction. The procedure involves accessing the tuberosity, removing/reshaping the excess bone, smoothing, and closing. Coverage is under oral surgery benefits (often as prosthetic preparation); documentation of the necessity supports the claim.

When it's typically used

D7485 is reported for the surgical reduction of an osseous (bony) tuberosity — surgically reshaping/removing excess bone of an enlarged bony tuberosity (typically the maxillary tuberosity, at the back of the upper jaw) — when it interferes with a prosthesis (like an upper denture) or function, to create a suitable contour. It's a pre-prosthetic procedure, distinct from reducing a fibrous (soft tissue) tuberosity (D7972).

How much does D7485 cost?

Surgical reduction of an osseous tuberosity is a moderate fee, often roughly 300 to 700 USD depending on region and the extent — for the surgical reshaping/removal of the excess bone. It's typically done as pre-prosthetic surgery (to allow a denture to fit). The fee reflects the surgical nature. It's distinct from (and may accompany) other pre-prosthetic procedures.

Is D7485 covered by insurance?

Covered under oral surgery benefits, often as prosthetic preparation (when the enlarged tuberosity interferes with a denture). Documentation of the necessity (the enlarged osseous tuberosity interfering with a prosthesis or function) supports the claim. It's distinct from reducing a fibrous (soft tissue) tuberosity (D7972) — D7485 is the osseous (bony) reduction. Some plans may exclude pre-prosthetic surgery. Verifying coverage helps.

What the osseous tuberosity is

The osseous tuberosity is a bony prominence at the back of the upper jaw, and understanding it clarifies this procedure.

A tuberosity is a rounded bony prominence (a bump or protrusion of bone). In the context of this code, the relevant tuberosity is typically the maxillary tuberosity — the bony prominence at the posterior (back) end of the upper jaw's alveolar ridge, located behind the last upper molar (or behind where it was). It's a normal anatomical structure (the back end of the upper ridge), but it can be enlarged — excessively large or bulbous — in some people. An osseous (bony) tuberosity refers to this bony prominence (as opposed to a fibrous tuberosity, which is enlarged due to excess soft/fibrous tissue rather than bone). So the osseous tuberosity is the bony prominence at the back of the upper jaw, which D7485 reduces when it's enlarged.

An enlarged maxillary tuberosity (whether bony, fibrous, or both) can be a problem — particularly for denture wearers (discussed next). D7485 specifically addresses the osseous (bony) component — surgically reducing the excess bone of the tuberosity. (If the enlargement is due to excess soft tissue — a fibrous tuberosity — that's reduced differently, e.g., D7972; sometimes both bony and fibrous reduction are needed.) So D7485 is for reducing the bony tuberosity. The dentist identifies an enlarged osseous tuberosity and reduces it when warranted. For patients, understanding what the osseous tuberosity is — the bony prominence at the back of the upper jaw (the maxillary tuberosity) — clarifies this procedure. It's the bony bump at the back of the upper jaw. The dentist reduces it when enlarged. Understanding this helps patients see that the osseous tuberosity is the bony prominence at the back of the upper jaw (the maxillary tuberosity, behind the last upper molar) — a normal structure that can be enlarged (bulbous) in some people — with D7485 surgically reducing the excess bone when the enlarged bony tuberosity causes problems, specifically addressing the osseous (bony) component (as opposed to a fibrous/soft-tissue enlargement, reduced differently).

Why an enlarged tuberosity is reduced

An enlarged tuberosity is reduced when it interferes, and understanding why clarifies the purpose.

An enlarged osseous tuberosity is reduced when it causes problems — most commonly interfering with an upper denture. The maxillary tuberosity is at the back of the upper ridge, where the back of an upper denture sits. If the tuberosity is enlarged (too large, bulbous, or extending down too far): it can prevent the denture from seating properly (the bulky tuberosity getting in the way); it can reduce the space available for the denture (especially the interarch space — the room between the upper and lower ridges — if the tuberosity hangs down too far, leaving insufficient room for the denture and the opposing teeth/denture); it can create undercuts that interfere with the denture's path of insertion; or it can otherwise compromise the denture's fit and stability. So an enlarged tuberosity can make a proper upper denture difficult. Reducing it (D7485) creates a suitable contour and adequate space for the denture.

So the main purpose of reducing the osseous tuberosity is pre-prosthetic — preparing the upper jaw so a denture (or other prosthesis) can fit properly. By reducing the excess bone, the tuberosity is brought to a suitable size/shape, providing the space and contour needed for the denture. (Other reasons to reduce a tuberosity could include if it interferes with function or causes problems, but the prosthetic reason is the main one.) So an enlarged tuberosity is reduced to enable a proper denture fit. The dentist reduces the tuberosity to prepare for the prosthesis. For patients, understanding why an enlarged tuberosity is reduced — because it interferes with an upper denture (fit, space, seating) — clarifies the purpose. It's reduced to allow the denture to fit. The dentist reduces it for that. Understanding this helps patients see that an enlarged osseous tuberosity is reduced when it interferes with an upper denture — a bulky or low-hanging tuberosity preventing proper seating, reducing the space for the denture (especially the room between the arches), or creating undercuts — so reducing the excess bone (D7485) creates a suitable contour and space for the denture, a pre-prosthetic procedure to enable a proper upper denture fit.

The reduction procedure

Reducing the tuberosity involves a surgical procedure, and understanding it clarifies what's involved.

Reducing an osseous tuberosity involves a surgical procedure to reshape/remove the excess bone. The procedure generally involves: anesthesia — numbing the area (local anesthesia, sometimes with sedation); accessing the tuberosity — making an incision and raising the soft tissue over the tuberosity to expose the bone; removing/reshaping the bone — removing the excess bone (using surgical instruments to reduce the bony tuberosity to a suitable size/contour), reducing it appropriately (e.g., taking down a bulbous prominence, or reducing it to gain interarch space); smoothing — smoothing the bone so it's even; and closing — trimming any excess soft tissue as needed and suturing the tissue closed over the reduced area. So the procedure exposes the tuberosity, reduces the bone, smooths it, and closes the tissue.

If the tuberosity enlargement involves both bone and excess soft tissue (a common combination), the procedure may address both — reducing the bone (D7485) and the soft tissue (which might be reported with a soft-tissue code like D7972, surgical reduction of fibrous tuberosity, if a distinct fibrous reduction is done). The procedure is done under local anesthesia (sometimes with sedation), as an outpatient procedure, followed by healing (with post-operative care). Once healed, the tuberosity is appropriately contoured — allowing the denture to fit. The oral surgeon performs the reduction. For patients, understanding that reducing the tuberosity involves a surgical procedure — exposing the bone, reducing/reshaping it, smoothing, and closing — clarifies what's involved. It's a surgical bone reduction. The surgeon performs it. Understanding this helps patients see that reducing an osseous tuberosity is a surgical procedure — numbing the area, raising the tissue to expose the bony tuberosity, removing/reshaping the excess bone to a suitable contour (and gaining space as needed), smoothing, and closing the tissue (sometimes also reducing excess soft tissue if present) — done under local anesthesia (sometimes with sedation) as an outpatient procedure, resulting in an appropriately contoured tuberosity (allowing a denture to fit).

Osseous vs fibrous tuberosity reduction

Osseous reduction differs from fibrous reduction, and understanding the distinction clarifies the coding.

There's a distinction between reducing an osseous (bony) tuberosity (D7485) and reducing a fibrous (soft tissue) tuberosity (D7972) — based on what's enlarged. An enlarged tuberosity can be due to excess bone (osseous), excess soft/fibrous tissue (fibrous), or both. Osseous tuberosity reduction (D7485) addresses excess bone — surgically removing/reshaping the bony enlargement. Surgical reduction of a fibrous tuberosity (D7972) addresses excess soft (fibrous) tissue — removing the excess soft tissue enlargement (a soft-tissue procedure). So the codes differ by the tissue addressed: D7485 for the bony component, D7972 for the soft-tissue (fibrous) component.

This matters for coding: the dentist assesses what's causing the enlargement (bone, soft tissue, or both) and codes accordingly. If the enlargement is bony, D7485 (osseous reduction). If it's excess fibrous soft tissue, D7972 (fibrous reduction). If both are enlarged, both procedures might be done (and both codes potentially reported, if distinct procedures are performed). So the dentist distinguishes the osseous from the fibrous component. Documentation should specify what was reduced (bone for D7485). So the dentist codes by whether the reduction is of bone (D7485) or soft tissue (D7972). The dentist codes by the tissue. For patients, understanding that osseous reduction (D7485, bony) differs from fibrous reduction (D7972, soft tissue) clarifies the coding. D7485 is for the bony component. The dentist codes by the tissue. Understanding this helps patients see that reducing an osseous (bony) tuberosity (D7485) is distinct from reducing a fibrous (soft tissue) tuberosity (D7972) — based on whether the enlargement is due to excess bone (D7485) or excess soft/fibrous tissue (D7972) — so the dentist assesses what's enlarged and codes accordingly (and if both bone and soft tissue are enlarged, both procedures might be done), with D7485 specifically for the surgical reduction of the bony tuberosity.

Frequently asked questions

What is the D7485 dental code?

It's the surgical reduction of an osseous tuberosity — surgically reshaping/removing excess bone of an enlarged bony tuberosity, typically the maxillary tuberosity (the bony prominence at the back of the upper jaw, behind the last molar). It's done when the enlarged tuberosity interferes with a prosthesis (like an upper denture) or function, to create a suitable contour.

What is the maxillary tuberosity?

The bony prominence at the back (posterior end) of the upper jaw's alveolar ridge, behind the last upper molar. It's a normal structure, but can be enlarged (bulbous) in some people. An enlarged one can interfere with an upper denture, which is why it may be reduced.

Why is it reduced?

Mainly when an enlarged tuberosity interferes with an upper denture — a bulky or low-hanging tuberosity can prevent proper seating, reduce the space for the denture (especially the room between the arches), or create undercuts. Reducing the excess bone creates a suitable contour and space for the denture (pre-prosthetic surgery).

What does the procedure involve?

A surgical procedure — numbing the area, raising the tissue to expose the bony tuberosity, removing/reshaping the excess bone to a suitable contour, smoothing, and closing the tissue (sometimes also reducing excess soft tissue if present). It's done under local anesthesia (sometimes with sedation) as an outpatient procedure.

How much does it cost?

Often around 300 to 700 USD, depending on the extent, for the surgical reshaping/removal of the excess bone. It's typically done as pre-prosthetic surgery (to allow a denture to fit). The fee reflects the surgical nature, and it may accompany other pre-prosthetic procedures.

How is it different from fibrous tuberosity reduction (D7972)?

D7485 reduces an osseous (bony) tuberosity (excess bone). D7972 reduces a fibrous (soft tissue) tuberosity (excess fibrous soft tissue). The codes differ by what's enlarged — bone (D7485) vs soft tissue (D7972). If both are enlarged, both procedures might be done.

This page is an independent, plain-language explanation for general information only. It is not billing, coding, or clinical advice. For the official CDT descriptor and current-year wording, refer to the American Dental Association.