ICD-10 code S42.143B: Displaced open glenoid cavity fracture

Key takeaways

S42.143B covers a displaced fracture of the glenoid cavity of the scapula, at an initial encounter for an open fracture.

The glenoid cavity sits on the scapula, so humerus codes never belong on this claim.

Category S42 uses only the 7th characters A, B, D, G, K, P and S.

A plain B means an open initial encounter, and category S42 has no Gustilo type behind it.

The shoulder side is unspecified here, so confirm it and move to S42.141B or S42.142B.

An open fracture of the scapula rarely arrives on its own. It usually sits inside a larger trauma case, and the emergency note gets written fast. So the shoulder side goes unrecorded, and nobody writes the word displaced.

Both omissions land in the same place. S42.143B describes a displaced fracture of the glenoid cavity of the scapula. The shoulder side is not stated, and the encounter is an initial one for an open fracture. ICD-10-CM tells you to code an unlabeled fracture as displaced, and an undocumented side as unspecified.

The code will pay. It also tells the payer that the chart was thin when the code was picked. Fixing that usually takes one look at the operative report.

S42.143B answers four questions at once

The full descriptor settles four things in a single line. It names the bone, the state of the fragments, the side, and the type of encounter. Here is the whole code in summary form.

The Centers for Medicare and Medicaid Services (CMS) revises ICD-10-CM every fiscal year. So confirm the code is still active for the year you are billing.

Every part of the descriptor needs backup in the chart

Each element of the descriptor commits you to something in the record. The table below shows what, element by element.

One of those five elements causes far more trouble than the rest, and it is not laterality.

Why humerus codes never belong on S42.143B

The glenoid cavity is part of the scapula, so a humerus code can never describe it. Think of the shoulder as a ball and socket joint. Its ball is the head of the humerus. That socket, on the outer edge of the scapula, is the glenoid cavity.

Any fracture of the humeral head, the greater tuberosity or the surgical neck sits in a different subcategory. That distinction causes the most common error on this code.

The swap looks like this. A nondisplaced greater tuberosity fracture of the right humerus, at an open initial encounter, is S42.254B. It belongs to S42.25, the greater tuberosity subcategory, and S42.256P shows how that family handles healing characters.

Because the glenoid cavity forms the joint surface, a displaced fracture here is intra-articular. Surgeons usually classify the pattern with the Ideberg system, modified by Goss.

Some use the AO classification instead. Those systems shape the operative plan, but they do not change the ICD-10-CM code.

Open scapular fractures also travel with company. Chest wall injuries, rib fractures, pneumothorax and brachial plexus injury show up alongside them.

Read the full trauma note before you close the encounter, because each finding carries its own code. The girdle can break in more than one place. Clavicle codes such as S42.012P follow the same displacement and laterality pattern.

Category S42 uses seven 7th characters and no others

Category S42 offers seven 7th characters, and S42.143 needs one of them to be billable. The CDC/NCHS ICD-10-CM web tool confirms the current list by fiscal year.

Two details in that list catch coders out. First, the subsequent characters drop the open and closed distinction. A healing open fracture still takes D, G, K or P, whichever fits.

Second, there is no character for a subsequent encounter during active treatment. Active treatment keeps A or B, even at a second visit. The character follows the type of care, not the number of visits.

Why there is no Gustilo type behind the B

For S42.143B, B means initial encounter for open fracture and nothing more. Category S42 has no Gustilo classification in its characters, and it has no C character at all. If a coding tool offers you S42.143C, the tool is wrong.

The Gustilo split that many coders expect does exist, but only in three fracture categories. Those are S52 for the forearm, S72 for the femur, and S82 for the lower leg and ankle. In those three, B covers Gustilo type I or II, and C covers type III.

You can see the forearm pattern in S52.021R and the femur pattern in S72.452Q.

That has a practical upside at the point of coding. The note does not need a Gustilo grade before you assign S42.143B. Nobody has to raise a query for it. The trauma surgeon may still grade the wound for treatment planning, and that grade belongs in the record. It just has no effect on the diagnosis code.

Six base codes split S42.14 by displacement and side

S42.14 splits six ways before the 7th character is added. The first three cover displaced fractures, and the last three cover nondisplaced ones. Within each set, the final digit carries the side.

Category S42 carries a note that fills the displacement column when the record is silent. A fracture not described as displaced or nondisplaced is coded as displaced. One not described as open or closed is coded as closed. S42.143B therefore sits where one default meets one documented finding.

Follow the tabular list down to the billable code

Working down the tabular list makes the neighboring codes easier to find. It also shows which level adds each piece of specificity.

• S00-T88 – Injury, poisoning and certain other consequences of external causes
• S40-S49 – Injuries to the shoulder and upper arm
• S42 – Fracture of shoulder and upper arm
• S42.1 – Fracture of scapula
• S42.14 – Fracture of glenoid cavity of scapula
• S42.143 – Displaced fracture of glenoid cavity of scapula, unspecified shoulder (base code, not billable on its own)
• S42.143B – Displaced fracture of glenoid cavity of scapula, unspecified shoulder, initial encounter for open fracture

Two exclusion notes sit at the category level. Traumatic amputation of the shoulder and upper arm is an Excludes1 note pointing to S48. That one is never coded with S42.143B.

Periprosthetic fracture around a prosthetic shoulder joint is an Excludes2 note pointing to M97.3. An Excludes2 code may be reported alongside S42.143B when the record documents both.

S42.143B is billable, and six rules shape how you report it

S42.143B is a complete seven-character code, and Medicare, Medicaid and commercial payers accept it. Six rules shape how you report it.

• Principal diagnosis: the code can lead the claim when the open fracture is the reason for the encounter. That is typical in emergency and acute orthopedic settings.
• External cause codes: the ICD-10-CM Official Guidelines for Coding and Reporting ask for a code from V00-Y99. It captures the mechanism of injury, such as a fall or a motor vehicle collision.
• Do not code the wound twice: the open fracture code already accounts for the wound. Leave the separate open wound code for the shoulder off the claim.
• Present on admission: inpatient claims need a POA indicator. A fracture sustained before arrival is present on admission.
• Grouping: on inpatient claims the code groups to the MS-DRG pair for fracture, sprain, strain and dislocation. That pair excludes femur, hip, pelvis and thigh, and it splits on major complications.
• Laterality is expected: payers query unspecified side codes, so treat S42.143B as a placeholder rather than a final answer.

How an open fracture claim actually moves

An open fracture claim runs through six steps, and two of them decide whether it pays clean. The wider medical billing chain is the same for any encounter, but fracture cases stall in predictable places.

1. Registration opens the encounter and the trauma workup begins.
2. Radiology reads the imaging and names the fracture site.
3. The surgeon documents the wound, the displacement and the operative plan.
4. A coder abstracts the record, assigns S42.143B and adds the external cause code.
5. Charges post, and a scrubber checks the claim for missing or conflicting fields.
6. The payer adjudicates, pays, or asks for the records.

Steps two and three carry the weight. Between them they supply the side, the displacement and the wound status. That is everything the diagnosis code needs.

When either one is vague, the coder at step four has to raise a query. The encounter then waits in accounts receivable while the answer comes back.

The scrubber at step five catches format problems, not clinical ones. It flags a missing POA indicator or an invalid 7th character. Software cannot see that the operative report named the left shoulder and the claim did not. A person catches that, or a template that asked for the side back at step three.

Four chart elements an auditor will look for

An auditor reviewing an S42.143B claim looks for four things. Three are usually in the chart already. The fourth is the one that sends the claim back.

1. Anatomic site: the imaging report should place the fracture line in the glenoid cavity. A radiology note that says glenoid fossa or glenoid rim supports the same subcategory.
2. Displacement: the treating clinician or radiologist should state that the fragments are displaced. If nobody says either way, the category default assigns displaced for you.
3. Open wound: the exam, emergency note or operative report must record a wound that communicates with the fracture. Without it, the A character applies.
4. Laterality: the note has to name the right or left shoulder. This is the element that is missing whenever S42.143B lands on a claim.

Chase laterality at the encounter rather than at billing. Operative reports, consent forms and imaging orders all carry the side. A query on it usually resolves in minutes, and the claim then moves to S42.141B or S42.142B.

Practices using digital intake forms can make these four elements required fields in a fracture assessment template. The answers then land in the record at the point of care, instead of in a retrospective query queue.

Structured fields beat free text here for one reason. A coder can read a checkbox without interpreting a sentence. Clinical documentation software stores those fields inside the encounter, not in a scanned attachment, which keeps them searchable at billing.

One trauma note, two possible codes

Here is how thin the margin gets. A cyclist arrives after a collision with a car. Emergency staff record a laceration over the left shoulder with bone visible. The CT report reads comminuted fracture through the glenoid fossa with a 6 mm step-off. Nobody writes the word displaced.

Four decisions follow from that note.

• Site: the fracture line runs through the glenoid fossa, so the subcategory is S42.14.
• Displacement: a step-off means the fragments have moved, which supports displaced. Even without the word, the category default lands in the same place.
• Wound: the laceration exposes bone at the fracture site, so the 7th character is B.
• Side: the note names the left shoulder, so the code is S42.142B.

Now delete one word. Strike left from every line of that chart, and the same injury becomes S42.143B. One adjective is the whole difference between a specific claim and an unspecified one.

The neighboring codes that get picked by mistake

Most wrong picks around this code come from thin documentation rather than a coding slip. The table shows the near neighbors and what separates each one.

The last three rows are the ones to watch. Body, neck and glenoid cavity are all scapula fractures, and radiology reports move between those terms freely. If the report describes a fracture line through the joint surface, the glenoid cavity subcategory is right.

Which CPT codes ride along with this diagnosis

S42.143B is a diagnosis code, so the procedure codes depend on how the fracture is treated.

Displaced intra-articular fractures with an open wound usually go to surgery. Confirm every descriptor against the current AMA CPT manual before you submit.

Debridement is the tier payers audit hardest

Debridement is where open fracture claims tend to stall. Payers audit these codes closely, so the operative note should record wound size, depth and contamination. The reference on 11012 sets out the note detail that supports the deeper tissue tiers.

Two more codes are worth knowing. 23670 covers open treatment of a shoulder dislocation with a greater tuberosity fracture. That sits on the humeral side of the joint, which is a different diagnosis code. Surgical cases also generate an anesthesia claim, and 00450 covers anesthesia for clavicle and scapula procedures.

Later visits move the encounter character

Rehabilitation billing needs the same care in the other direction. A therapy visit weeks after surgery is a subsequent encounter, so it takes S42.143D rather than S42.143B.

Carrying the initial encounter character into rehabilitation is a compliance error. A connected clinical record keeps the original fracture detail visible to whoever codes the follow-up.

Late reconstruction sits further out again. Post-traumatic arthritis of the shoulder can eventually lead to joint replacement, and 23472 covers that procedure. At that point the fracture is reported with the sequela character, S42.143S, after the code for the late condition.

Five mistakes that get this code denied

Five mistakes account for most denials on this code, and all five are avoidable at the desk.

1. Coding the humerus instead of the scapula. Greater tuberosity and humeral head fractures live in S42.2, not S42.14.
2. Reaching for a Gustilo type. There is no C character in this category, so B stands alone.
3. Leaving the side unspecified. If the operative report names a shoulder, the claim should carry S42.141B or S42.142B.
4. Adding a separate open wound code. The B character already accounts for the wound at the fracture site.
5. Reusing B at rehabilitation. Once active treatment ends, the encounter takes D, G, K or P instead.

Run this check before you submit

All of the above condenses into seven questions. Answer them from the chart before the claim leaves the practice.

• Does the imaging report place the fracture in the glenoid cavity, rather than the scapular body or neck?
• Does any note name the right or left shoulder? If so, the code is S42.141B or S42.142B.
• Is there a documented wound at the fracture site? Without one, the character is A.
• Is this encounter still active treatment? If the patient is in rehabilitation, use D, G, K or P.
• Is a mechanism code from V00-Y99 on the claim?
• On an inpatient claim, is the POA indicator set?
• Have you kept a separate open wound code off the claim?

None of these takes long on its own. Together they remove the two most common reasons an open fracture claim comes back. Those two are a missing side and a wrong encounter character.

How Pabau keeps open fracture claims moving

In most practices the fracture detail is captured once and then re-entered several times. The radiology report lands in one place and the operative note in another. A coder then rebuilds the picture at billing, which is where the shoulder side goes missing.

Practice management software like Pabau keeps the whole episode in one patient record. Custom fracture templates capture side, displacement and wound status as structured fields.

Imaging and operative notes attach to the same encounter, so coders read the answer instead of chasing it. That matters most in orthopedic and sports medicine practices, where trauma volume is high.

From there, claims management validates insurer fields before submission, so incomplete claims are corrected in-house rather than returned. Follow-up visits open against the same record, so the physical therapy team picking up rehabilitation sees the original encounter. Switching from an initial to a subsequent character is then straightforward.

Send fracture claims out complete the first time

Pabau is practice management software for orthopedic, sports medicine and rehabilitation practices. It keeps imaging, clinical notes and claim submission in one record. Coders then get the laterality detail without raising a query.

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Conclusion

S42.143B is a billable code with one soft edge. The site, the displacement and the open wound are all firm. That soft edge is the unspecified shoulder, and it tells you the record was thin. Treat it as a prompt to open the operative report, not a finished answer.

Get the anatomy right first, since the glenoid cavity is scapula and the tuberosities are humerus. Skip the Gustilo question, because category S42 does not ask it. Then confirm the side, and the claim usually becomes S42.141B or S42.142B. To see how Pabau supports that workflow in your practice, book a demo.

Continue your research

Coding the humerus side of the same joint? ICD-10 code S42.256P walks through the greater tuberosity family and its healing characters.

Need the categories where Gustilo type does change the character? ICD-10 code S52.021R shows the open fracture split in the forearm group.

Coding another shoulder girdle fracture? ICD-10 code S42.012P covers clavicle displacement and laterality rules in the same category.

Billing the debridement alongside the fracture? CPT code 11012 explains the tissue depth tiers and the note detail payers expect.

Coding the shoulder replacement years later? CPT code 23472 sets out the billing rules for total shoulder arthroplasty.

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