What D7550 means

D7550 covers a partial ostectomy/sequestrectomy for removal of non-vital bone. "D" is dental, "75" is this oral surgery group, and "50" is this dead-bone removal. 'Non-vital bone' is dead bone — bone that has lost its blood supply and/or vitality and is no longer living. 'Ostectomy' means removal of bone; 'partial ostectomy' means removing part of the bone. 'Sequestrectomy' means removing a sequestrum — a sequestrum (plural sequestra) is a piece of dead bone that has separated/detached from the surrounding living bone. So D7550 is for surgically removing dead (non-vital) bone from the jaw — removing the dead bone fragments (sequestra) and/or partially removing affected bone — to clean out the dead bone and allow healthy healing.

So it's removing dead (non-vital) bone from the jaw — the dead pieces (sequestra) and affected bone — so the area can heal.

Bone can become non-vital (die) from various causes: osteomyelitis (a bone infection — the infection can kill areas of bone, which then become sequestra); osteonecrosis (bone death from causes like impaired blood supply — e.g., medication-related osteonecrosis of the jaw, or radiation-related osteoradionecrosis); trauma; or other causes. Dead bone is a problem — it can't heal, it can harbor infection (acting as a nidus/source), and it impedes the healing of the surrounding area (the body tries to wall off and expel the dead bone). Removing the non-vital bone (D7550) — the sequestra and affected bone — eliminates this dead, often infected material, allowing the healthy bone to heal. The procedure involves accessing the area and removing the dead bone (down to healthy, bleeding bone — viable bone bleeds, dead bone doesn't), and is part of managing the underlying condition (e.g., the osteomyelitis or osteonecrosis). D7550 is a 'report needed' code in some contexts (documentation of the procedure). Coverage may be under dental or medical (especially for conditions like osteomyelitis/osteonecrosis, which are medical); documentation of the non-vital bone and its removal supports the claim.

When it's typically used

D7550 is reported for removing non-vital (dead) bone from the jaw — a sequestrectomy (removing detached dead bone fragments, sequestra) and/or partial ostectomy (partially removing affected bone). It's used when bone has died (from osteomyelitis, osteonecrosis, trauma, or other causes) and the dead bone must be removed to allow healing and address infection.

How much does D7550 cost?

A partial ostectomy/sequestrectomy is a moderate fee, often roughly 300 to 1,000+ USD depending on region and the extent — for removing the non-vital bone. The cost varies with how much dead bone is removed and the complexity (a small sequestrum vs extensive non-vital bone). It's part of managing the underlying condition (e.g., osteomyelitis/osteonecrosis), which may involve other treatment (antibiotics, etc.). Verify your specific coverage.

Is D7550 covered by insurance?

Coverage may be under dental or medical benefits — especially for underlying conditions like osteomyelitis or osteonecrosis (which are medical conditions), medical insurance may be relevant. D7550 is a 'report needed' code in some contexts (documentation of the procedure required). Documentation of the non-vital bone (the dead bone, the cause/condition) and its removal supports the claim. It's part of managing the underlying condition. Verifying coverage (and whether medical or dental applies) helps.

What non-vital bone is and why it forms

Non-vital bone is dead bone, and understanding why it forms clarifies the need for removal.

Understanding what non-vital bone is and why it forms clarifies D7550. Bone is living tissue with a blood supply that keeps it vital (alive). 'Non-vital bone' is dead bone — bone that has lost its blood supply and/or been killed, so it's no longer living tissue. When a piece of dead bone separates from the surrounding living bone, it's called a sequestrum. Bone becomes non-vital from various causes: osteomyelitis — a bone infection; the infection (and the inflammation/pressure it causes) can impair the blood supply to areas of bone, killing them (forming sequestra) — osteomyelitis is a classic cause of bone sequestration; osteonecrosis — bone death from impaired blood supply or other causes, including medication-related osteonecrosis of the jaw (MRONJ, associated with certain medications like bisphosphonates/antiresorptives or others) and osteoradionecrosis (ORN, related to prior radiation to the jaw, which damages the bone's blood supply); trauma — severe trauma can devitalize bone; and other causes. So non-vital bone forms when the bone's vitality is lost, often from infection, impaired blood supply, or related conditions.

Why it's a problem: dead bone can't heal or remodel (it's not living), it can harbor and sustain infection (acting as a persistent source/nidus that bacteria colonize, perpetuating osteomyelitis), and it impedes healing of the surrounding area (the body recognizes it as foreign/dead and tries to wall it off and expel it, but it interferes with normal healing). So non-vital bone needs to be removed for the area to heal and for infection to be controlled. So non-vital bone is dead bone (from infection, impaired blood supply, etc.) that must be removed. The surgeon removes it. For patients, understanding what non-vital bone is and why it forms clarifies the need for removal. It's dead bone causing problems. The surgeon removes it. Understanding this helps patients see that non-vital bone is dead bone — bone that has lost its blood supply/vitality (a separated piece being a sequestrum) — which forms from causes like osteomyelitis (a bone infection that impairs the blood supply and kills bone), osteonecrosis (bone death from impaired blood supply or related conditions, including medication-related osteonecrosis of the jaw and osteoradionecrosis from prior radiation), trauma, or others — and is a problem because dead bone can't heal, harbors and sustains infection, and impedes the surrounding area's healing, so it needs to be removed (D7550) for healing and infection control.

The removal procedure

Removing non-vital bone involves cleaning down to healthy bone, and understanding this clarifies the procedure.

The removal of non-vital bone (D7550) involves accessing and removing the dead bone down to healthy bone — and understanding this clarifies the procedure. The procedure generally involves: accessing the area — accessing the non-vital bone (which may be exposed already, e.g., in some osteonecrosis, or require accessing through the tissue); removing the dead bone — removing the sequestra (the detached dead fragments — a sequestrectomy) and partially removing affected non-vital bone (a partial ostectomy), taking away the dead material; removing down to viable bone — a key principle is removing the dead bone until healthy, viable bone is reached — viable (living) bone has a blood supply and bleeds when cut (the 'bleeding bone' sign), while dead bone doesn't bleed; so the surgeon removes the non-bleeding (dead) bone until bleeding (living) bone is encountered, indicating healthy bone; and managing the area — smoothing the bone, irrigating, and closing/managing the site to promote healing. So the procedure removes the dead bone down to healthy, bleeding bone.

The extent varies with the amount of non-vital bone — a small sequestrum is a minor removal, while extensive non-vital bone (e.g., from significant osteomyelitis or osteonecrosis) requires more removal (and the condition may need staged or more extensive surgery). The removal is often combined with treating the underlying condition (e.g., antibiotics for osteomyelitis, managing the factors in osteonecrosis). After removing the dead bone, the healthy bone and tissue can heal. So removing non-vital bone means clearing the dead bone down to viable bone. The surgeon performs it. For patients, understanding that removing non-vital bone involves cleaning down to healthy bone clarifies the procedure. It removes dead bone to healthy bone. The surgeon performs it. Understanding this helps patients see that removing non-vital bone (D7550) involves accessing and removing the dead bone — the sequestra (detached dead fragments, a sequestrectomy) and affected non-vital bone (a partial ostectomy) — down to healthy, viable bone (a key principle: removing the non-bleeding dead bone until bleeding, living bone is reached, indicating healthy tissue) and then managing the area (smoothing, irrigating, closing) to promote healing — with the extent varying from a small sequestrum to extensive non-vital bone (which may need more or staged surgery), often combined with treating the underlying condition (antibiotics for osteomyelitis, etc.), so the healthy bone can then heal.

Underlying conditions: osteomyelitis and osteonecrosis

Non-vital bone relates to underlying conditions, and understanding them clarifies the broader care.

The removal of non-vital bone (D7550) is usually part of managing an underlying condition — and understanding the main ones clarifies the broader care. Osteomyelitis (bone infection): an infection of the bone (in the jaw, often from a dental source — e.g., a severe tooth infection spreading to the bone — or other causes), which can cause areas of bone to die (sequestra). Managing osteomyelitis involves both removing the dead/infected bone (D7550) and treating the infection (antibiotics, often a prolonged course; addressing the source; sometimes more extensive surgery for severe cases). Osteonecrosis of the jaw: bone death not primarily from infection but from impaired bone vitality — the main types being medication-related osteonecrosis of the jaw (MRONJ — associated with certain medications, notably antiresorptive drugs like bisphosphonates used for osteoporosis/cancer, and some others, which can impair the bone's ability to heal) and osteoradionecrosis (ORN — from prior radiation therapy to the head/neck, which damages the bone's blood supply). Managing osteonecrosis is nuanced — it involves careful, often conservative management (since aggressive surgery can sometimes worsen it), with removal of non-vital bone (D7550) as appropriate, alongside managing the contributing factors and the symptoms.

So D7550 (removing dead bone) is one component within managing these conditions — which involve a broader approach (infection control, managing medications/radiation history, conservative vs surgical decisions, and follow-up). These conditions (especially MRONJ and ORN) are significant and require specialist management (oral and maxillofacial surgery, in coordination with the patient's physicians — e.g., the prescriber of an antiresorptive, or the oncologist/radiation history). The care is individualized to the condition. So non-vital bone removal relates to managing these underlying conditions. The team manages the broader care. For patients, understanding the underlying conditions clarifies the broader care. The dead bone relates to a condition. The team manages it. Understanding this helps patients see that removing non-vital bone (D7550) is usually part of managing an underlying condition — most notably osteomyelitis (a bone infection that kills bone, managed by removing the dead/infected bone plus treating the infection with antibiotics and addressing the source) and osteonecrosis of the jaw (bone death from impaired vitality, including medication-related osteonecrosis/MRONJ from antiresorptive and other drugs, and osteoradionecrosis/ORN from prior radiation, managed carefully — often conservatively — with non-vital bone removal as appropriate alongside managing the contributing factors) — so D7550 is one component within a broader, often specialist-managed approach (infection control, managing medications/radiation history, conservative vs surgical decisions, follow-up), coordinated with the patient's physicians, and individualized to the condition.

When to seek care for jaw bone problems

Certain signs warrant care for jaw bone problems, and understanding them clarifies when to seek help.

Certain signs and situations warrant seeking care for potential jaw bone problems (that might involve non-vital bone) — and understanding them clarifies when to seek help. Signs that may indicate a bone problem (like osteomyelitis or osteonecrosis) include: exposed bone — an area of bone visible/exposed in the mouth (not healing over), especially if persistent — exposed bone in the jaw is a hallmark of osteonecrosis (e.g., MRONJ/ORN); persistent pain or swelling — ongoing pain, swelling, or signs of infection in the jaw; non-healing — an area (e.g., an extraction site) that isn't healing as expected, or that breaks down; drainage — pus or drainage from an area of the jaw; loose pieces of bone — feeling rough or loose bony fragments (sequestra) in the mouth; and numbness or other concerning symptoms. So these signs warrant evaluation.

Importantly, for people with risk factors for osteonecrosis — notably those taking or who have taken antiresorptive medications (like bisphosphonates, often for osteoporosis or cancer) or other associated drugs, or who have had radiation to the jaw — awareness is especially important: such individuals should inform their dentist/surgeon of this history (it affects the approach to any dental surgery, to reduce the risk of triggering osteonecrosis), and should seek care for any concerning signs (like exposed bone). Prevention and careful management are key for these higher-risk situations. So seeking timely care for the signs (and disclosing risk factors) is important. The dentist/surgeon evaluates and manages. For patients, understanding when to seek care for jaw bone problems clarifies when to act. Certain signs warrant evaluation. The provider manages it. Understanding this helps patients see that certain signs warrant seeking care for potential jaw bone problems (which might involve non-vital bone) — exposed bone (a hallmark of osteonecrosis, especially if persistent), persistent pain/swelling or signs of infection, non-healing areas (e.g., an extraction site that breaks down), drainage, or loose bony fragments — and that awareness is especially important for people with risk factors for osteonecrosis (those taking/having taken antiresorptive medications like bisphosphonates, or with prior jaw radiation), who should disclose this history to their dentist/surgeon (it affects the approach to dental surgery to reduce risk) and seek care for any concerning signs — so timely evaluation and management (and prevention in higher-risk situations) are key, with the provider evaluating and managing the condition.

Frequently asked questions

What is the D7550 dental code?

It's a partial ostectomy/sequestrectomy for the removal of non-vital (dead) bone — surgically removing dead bone from the jaw, including detached dead fragments (sequestra) and partially removing affected bone. It's done when bone has died (from infection, osteonecrosis, or other causes) and must be removed to allow healing.

What is non-vital bone?

Dead bone — bone that has lost its blood supply and/or vitality, so it's no longer living. A separated piece of dead bone is a 'sequestrum.' It forms from causes like osteomyelitis (a bone infection), osteonecrosis (including medication-related osteonecrosis or osteoradionecrosis from radiation), or trauma.

Why does dead bone need to be removed?

Because dead bone can't heal, it can harbor and sustain infection (acting as a persistent source), and it impedes the surrounding area's healing (the body tries to wall it off and expel it). Removing it allows the healthy bone to heal and helps control infection. The surgeon removes it down to healthy, bleeding (living) bone.

What conditions cause this?

Most commonly osteomyelitis (a bone infection that kills bone) and osteonecrosis of the jaw — including medication-related osteonecrosis (MRONJ, associated with antiresorptive drugs like bisphosphonates and some others) and osteoradionecrosis (ORN, from prior radiation to the jaw). Also trauma. These often need broader, specialist management beyond the bone removal.

When should I seek care?

For signs like exposed bone in the mouth (especially if persistent — a hallmark of osteonecrosis), persistent jaw pain/swelling or signs of infection, a non-healing area (e.g., an extraction site that breaks down), drainage, or loose bony fragments. People taking antiresorptive medications or with prior jaw radiation should especially disclose this and seek care for such signs.

How much does it cost, and what insurance applies?

Often around 300 to 1,000+ USD depending on the extent. Coverage may be under dental or medical — for underlying conditions like osteomyelitis or osteonecrosis (medical conditions), medical insurance may be relevant. It's part of managing the underlying condition (which may involve other treatment). Verify your specific 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.