What D7943 means

D7943 covers an osteotomy of the mandibular rami with bone graft, including obtaining the graft. "D" is dental, "79" is this oral surgery area, and "43" is this ramus osteotomy with bone graft. It's the mandibular rami osteotomy (cutting the rami to reposition the lower jaw — see D7941) plus a bone graft, with the code explicitly including obtaining (harvesting) the graft material. So D7943 is the grafted version of the mandibular rami osteotomy.

So it's the same lower-jaw ramus osteotomy as D7941, but also including a bone graft and harvesting that graft — used when grafting is needed.

D7943 is essentially D7941 (the mandibular rami osteotomy — see that code for the full description of the osteotomy: cutting the rami, repositioning the lower jaw, fixation, closure, and post-op care) with the addition of a bone graft. It's reported instead of D7941 when the surgery includes grafting bone — which may be needed in situations such as: a large advancement — when the lower jaw is advanced a significant distance, the bone cut surfaces may not fully overlap, leaving a gap that's bone-grafted to promote healing and stability; reconstruction/defects — when there's a bony defect or deficiency to graft in conjunction with the osteotomy; and stability — when grafting supports the healing/stability of the repositioned jaw. The key distinction from D7941 is the inclusion of the bone graft and, importantly, the obtaining of the graft material — the code covers harvesting the bone graft (e.g., from a donor site) as well as placing it. So if a graft is harvested and used as part of the ramus osteotomy, D7943 captures the osteotomy-plus-graft as a unit (rather than coding the graft separately). It's done under general anesthesia as part of orthognathic surgery. It's performed by an oral and maxillofacial surgeon. These procedures are frequently medically necessary, so medical coverage often applies. This code is in the orthognathic surgery area (D7940-D7949). Documentation supports the claim.

When it's typically used

D7943 is reported for a mandibular rami osteotomy that includes a bone graft (and obtaining the graft) — the same lower-jaw ramus osteotomy as D7941, but with bone grafting added — used when the jaw repositioning needs grafting (e.g., a large advancement leaving a gap, a bony defect, or for stability/healing). It's the grafted version of D7941, including harvesting the graft.

How much does D7943 cost?

A mandibular rami osteotomy with bone graft is a major orthognathic surgery (under general anesthesia) — its cost is significant (typically more than the non-grafted D7941, given the added graft and harvesting), often in the multiple-thousands range. Sample fee-schedule values are in the four-figure range (varying by region/case). As it's frequently medically necessary, medical coverage often applies. Verify your specific coverage.

Is D7943 covered by insurance?

Like the non-grafted version, a mandibular rami osteotomy with bone graft (orthognathic surgery) is frequently medically necessary, so it's often covered under medical benefits (check both medical and dental plans; many have specific orthognathic-surgery criteria). Documentation of the deformity, the medical necessity, and the need for the bone graft is essential, and preauthorization is typically required. The code includes obtaining the graft (so the graft harvesting isn't separately coded). Verifying coverage helps.

The osteotomy plus a bone graft

D7943 adds grafting to the ramus osteotomy, and understanding this clarifies the code.

Understanding D7943 clarifies how it relates to D7941. D7943 is the mandibular rami osteotomy — the same core procedure as D7941 (cutting through the rami of the lower jaw to reposition it, with the exposure, bone cut, fixation, closure, and routine post-op care) — but with the addition of a bone graft. So everything D7941 covers, D7943 also covers, plus the grafting. A bone graft is bone (the patient's own, or donor/substitute bone) placed at a site to fill a gap, support healing, or augment the bone. In the context of the ramus osteotomy, a graft may be placed where the repositioned bone needs it.

Importantly, the code includes obtaining the graft — meaning the harvesting of the graft material (e.g., taking bone from a donor site) is part of this code, not a separate procedure. So D7943 bundles the osteotomy and the complete grafting (harvest + placement) into one code. This is why D7943 (rather than D7941) is used when the surgery includes grafting: it captures the added work of the graft and its harvest. So D7943 is the ramus osteotomy with bone grafting included. Understanding this helps patients see that D7943 is the mandibular rami osteotomy (the same core procedure as D7941 — cutting through the rami to reposition the lower jaw, with the exposure, bone cut, fixation, closure, and routine post-op care) but with the addition of a bone graft (so everything D7941 covers, D7943 also covers, plus the grafting) — a bone graft being bone (the patient's own, or donor/substitute) placed to fill a gap, support healing, or augment the bone, placed in the ramus osteotomy where the repositioned bone needs it — with the code importantly including obtaining the graft (the harvesting of the graft material, e.g., from a donor site, being part of this code, not a separate procedure), so D7943 bundles the osteotomy and the complete grafting (harvest + placement) into one code, used (rather than D7941) when the surgery includes grafting.

When grafting is needed

Certain situations call for a graft with the osteotomy, and understanding them clarifies the indication.

Understanding when grafting is needed clarifies why D7943 (vs D7941) is used. Not every mandibular osteotomy needs a bone graft — D7943 applies when grafting is part of the procedure, which may be indicated in situations such as: a large advancement — when the lower jaw is moved a significant distance forward, the cut bone surfaces (which normally overlap for healing) may separate or leave a gap; grafting bone into the gap supports healing and the stability of the large movement; a bony defect or deficiency — when there's a defect, deficiency, or area needing bone augmentation in conjunction with the osteotomy (e.g., reconstructing along with repositioning); and stability/healing support — when the surgeon judges that grafting will improve the healing or stability of the repositioned jaw in that case.

So grafting is added when the bony situation calls for it — most classically a large jaw movement that leaves a gap to fill. When grafting is done, D7943 (with its included graft and harvest) is the appropriate code; when no graft is needed, D7941 is used. The surgeon determines whether grafting is needed based on the planned movement and the bony anatomy. So D7943 is for osteotomies where grafting is needed. Understanding this helps patients see that not every mandibular osteotomy needs a bone graft (D7943 applying when grafting is part of the procedure) — indicated in situations such as a large advancement (when the lower jaw is moved a significant distance forward, the cut bone surfaces, which normally overlap for healing, may separate or leave a gap, so grafting bone into the gap supports healing and the stability of the large movement), a bony defect or deficiency (a defect, deficiency, or area needing bone augmentation in conjunction with the osteotomy, e.g., reconstructing along with repositioning), and stability/healing support (when the surgeon judges grafting will improve the healing or stability of the repositioned jaw) — so grafting is added when the bony situation calls for it (most classically a large jaw movement leaving a gap to fill), with D7943 (graft + harvest included) the appropriate code when grafting is done and D7941 used when no graft is needed, the surgeon determining the need based on the planned movement and bony anatomy.

'Includes obtaining the graft'

The harvesting is bundled into this code, and understanding this clarifies the coding.

Understanding the 'includes obtaining the graft' part clarifies the coding of D7943. In CDT, grafting procedures vary in whether the code includes harvesting the graft material or whether the harvest is coded separately — and the nomenclature specifies which. D7943 explicitly states it includes obtaining the graft — so the harvesting of the bone graft (taking it from the donor site) is part of D7943, bundled in, not billed as a separate procedure. This is important for correct coding: the surgeon doesn't separately code the graft harvest when using D7943 (the harvest is already in the code).

This contrasts with some other situations where graft harvesting is coded separately (e.g., there's a specific code for harvesting bone in certain contexts, used when a graft procedure's code doesn't include the harvest). For D7943, though, the inclusion is explicit — the osteotomy, the graft placement, and the graft harvest are all one code. So when reporting D7943, it captures the complete osteotomy-with-grafting (including the harvest). Knowing this prevents incorrect separate coding of the harvest. So D7943 includes obtaining the graft. Understanding this helps patients see that in CDT, grafting procedures vary in whether the code includes harvesting the graft material or whether the harvest is coded separately (the nomenclature specifying which), and D7943 explicitly states it includes obtaining the graft — so the harvesting of the bone graft (taking it from the donor site) is part of D7943 (bundled in, not billed separately) — important for correct coding (the surgeon not separately coding the graft harvest when using D7943, since the harvest is already in the code), contrasting with some situations where graft harvesting is coded separately (e.g., a specific code for harvesting bone in certain contexts, used when a graft code doesn't include the harvest), so for D7943 the osteotomy, the graft placement, and the graft harvest are all one code (capturing the complete osteotomy-with-grafting), which prevents incorrect separate coding of the harvest.

Where D7943 fits in the codes

D7943 is the grafted mandibular osteotomy, and understanding this clarifies the coding.

Understanding where D7943 sits clarifies the coding. D7943 is among the orthognathic surgery codes (D7940-D7949), paired with D7941 as the mandibular rami osteotomy codes: mandibular rami osteotomy (D7941) — without a bone graft; and mandibular rami osteotomy with bone graft, includes obtaining the graft (D7943, this code) — with a bone graft and its harvest. So the choice between D7941 and D7943 is simply whether a bone graft is part of the procedure (D7943 if grafting, D7941 if not). The other mandibular osteotomy codes are D7944 (segmented/subapical) and D7945 (body of mandible); the maxillary ones are the LeFort codes (D7946-D7949).

D7943 specifically is the grafted ramus osteotomy. The surgeon codes D7943 when the ramus osteotomy includes a bone graft (and uses D7941 when it doesn't), plus the maxillary code(s) if the upper jaw is also operated. The 'with bone graft, includes obtaining the graft' distinction is the key feature versus D7941. So D7943 is the grafted mandibular rami osteotomy among the orthognathic codes. Understanding this helps patients see that D7943 is among the orthognathic surgery codes (D7940-D7949), paired with D7941 as the mandibular rami osteotomy codes — mandibular rami osteotomy (D7941, without a bone graft) and mandibular rami osteotomy with bone graft, includes obtaining the graft (D7943, this code, with a bone graft and its harvest) — so the choice between them is simply whether a bone graft is part of the procedure (D7943 if grafting, D7941 if not), with the other mandibular osteotomy codes being D7944 (segmented/subapical) and D7945 (body of mandible) and the maxillary ones the LeFort codes (D7946-D7949) — so D7943 specifically is the grafted ramus osteotomy, coded when the ramus osteotomy includes a bone graft (and D7941 when it doesn't), plus the maxillary code(s) if the upper jaw is also operated, the 'with bone graft, includes obtaining the graft' distinction being the key feature versus D7941.

Frequently asked questions

What is the D7943 dental code?

It's an osteotomy of the mandibular rami WITH a bone graft, including obtaining the graft — the same lower-jaw ramus osteotomy as D7941 (cutting the rami to reposition the lower jaw), but also including a bone graft and the harvesting of that graft. It's used when the jaw repositioning needs grafting (e.g., a large advancement leaving a gap, or for stability/healing).

How is it different from D7941?

D7943 is D7941 (the mandibular rami osteotomy) PLUS a bone graft (and obtaining the graft). So the difference is the bone graft: D7943 when the procedure includes grafting, D7941 when it doesn't. Everything D7941 covers (the osteotomy, fixation, closure, follow-up), D7943 also covers, with the graft added.

When is a bone graft needed with the osteotomy?

Most classically when the lower jaw is advanced a significant distance, leaving a gap between the cut bone surfaces that's grafted to support healing and stability. Also for a bony defect/deficiency to reconstruct in conjunction with the osteotomy, or when the surgeon judges grafting will improve the healing/stability of the repositioned jaw.

What does 'includes obtaining the graft' mean?

It means the harvesting of the bone graft (taking it from the donor site) is part of this code — bundled in, not billed as a separate procedure. So when using D7943, the surgeon doesn't separately code the graft harvest; the osteotomy, the graft placement, and the graft harvest are all in the one code.

Where does the graft bone come from?

It can be the patient's own bone (autograft, harvested from a donor site) or donor/substitute bone, depending on the case. When it's the patient's own bone, the harvesting from the donor site is included in D7943 ('includes obtaining the graft'). The surgeon chooses the graft type based on the situation.

What does it cost, and is it covered?

It's a major orthognathic surgery (under general anesthesia) — cost is significant (typically more than the non-grafted D7941, given the added graft and harvesting), often in the multiple-thousands range. As it's frequently medically necessary, medical coverage often applies (check both plans; specific criteria and preauthorization typically apply). Verify your coverage.

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.