ICD-10 code S32.484A: Nondisplaced dome fracture of right acetabulum

Key takeaways

S32.484A is a billable ICD-10-CM code for a nondisplaced dome fracture of the right acetabulum, initial encounter for closed fracture. It is valid for FY2026, effective October 1, 2025.

The 7th character A covers active treatment during the initial encounter for a closed fracture. Using it on a follow-up visit is a coding error that invites an audit.

Laterality decides the code. S32.484A is right-side only, and S32.485A covers the left acetabulum, so mixing the two produces denials.

Practice management software like Pabau helps orthopedic and trauma practices pair codes correctly, document laterality, and submit HIPAA-compliant claims.

ICD-10 code S32.484A is a billable and specific ICD-10-CM diagnosis code valid for the 2026 fiscal year (effective October 1, 2025). It is valid for HIPAA-covered transactions when submitted on a claim. The full clinical description is nondisplaced dome fracture of the right acetabulum, initial encounter for closed fracture.

Each part of the code carries its own documentation requirement.

• Nondisplaced: The bone fragments stay anatomically aligned after the fracture.
• Dome: The superior, weight-bearing roof of the hip socket.
• Right: The laterality, which a payer reads as a different code from the left side.
• Initial encounter: The patient is still under active treatment for the injury.
• Closed fracture: The skin over the fracture site is intact.

What is a dome fracture of the acetabulum?

The acetabulum is the cup-shaped socket of the pelvis that meets the femoral head to form the hip joint. The dome, also called the acetabular roof, is the weight-bearing portion directly above the femoral head.

Fractures here matter clinically because the dome carries body weight during standing and walking. A nondisplaced fracture means the fracture line is present but the fragments have not shifted out of position.

• Nondisplaced: The fracture line shows on imaging while the fragments stay aligned. The digit 4 in position five records this.
• Displaced: The fragments have shifted out of anatomical position. S32.481A is the displaced equivalent on the right side.
• Closed fracture: The skin over the site is intact, with no wound reaching the bone. The 7th character A confirms a closed fracture at the initial encounter.
• Open fracture: A wound communicates with the fracture site. Open injuries take a different 7th character set and a different parent code.

Displacement status comes from the physician’s note, the imaging report, or the operative note. Coders should never assume it.

Code classification and hierarchy

Knowing where S32.484A sits in the ICD-10-CM hierarchy tells you which parent code to reach for when specificity runs out. It also explains why the code lives in the injury chapter rather than the musculoskeletal one. Other nondisplaced fracture codes such as S52.355J follow the same parent-child structure.

According to the CMS ICD-10-CM tabular list, codes in the S32 category need a 7th character to be complete and billable. Submitting S32.484 without one will reject.

What the 7th character means and when it changes

The 7th character is one of the most audited elements in ICD-10-CM claims. Billing A for a patient who has already finished definitive treatment is a coding error. The same logic drives codes like S42.409P, where the final character records malunion instead of active care.

Initial encounter does not mean the patient’s first visit to any provider. It means the patient is still in the active treatment phase. A patient who transfers to a new orthopedic surgeon for ongoing treatment is still coded with A.

Once definitive treatment ends, move to D or G based on documented healing. The character S works differently, marking the late effect that remains after healing, as it does in S43.491S.

S32.484A initial encounter: Documentation requirements

The physician’s documentation must establish all three defining elements before S32.484A goes on a claim. Weak documentation on any one of them invites a denial. HIPAA compliance in billing rests on notes that substantiate every submitted code. Digital intake forms at the first assessment capture laterality and fracture type consistently.

• Closed fracture: The note must confirm the skin over the fracture site is intact. If the operative report describes a wound reaching the fracture, S32.484A is wrong.
• Nondisplaced: The radiology report or physician note must say nondisplaced or use equivalent wording. Ambiguous documentation is a query, not a coding decision.
• Right laterality: The note or imaging must specify the right acetabulum or the right hip socket. Bilateral injuries need a separate code for each side.
• Initial encounter: Visit notes must show active management, such as diagnostic evaluation, treatment initiation, or surgical planning. Once that ends, the 7th character moves to D, G, or K.
• External cause code: Guidelines expect an external cause code from V, W, X, or Y alongside S32.484A. Many payers require it on trauma claims.

Related ICD-10 codes in the S32.48 family

The S32.48 block covers dome fractures on both sides and in both displacement categories. Picking the wrong member of this family is the most common laterality error in pelvic fracture coding. Teams handling physical therapy billing meet these pairs constantly in post-acute work.

Non-traumatic acetabular conditions sit outside this block. Protrusio acetabuli, for example, is coded as M24.7.

Avoid the unspecified laterality codes when the documentation names the side. S32.483A and S32.486A are last resorts, used only after a physician query fails to settle it.

CPT codes paired with an acetabular dome fracture

S32.484A pairs with a procedural CPT code based on the treatment delivered. The choice depends on whether the surgeon performs open reduction, closed treatment, or non-surgical care. The AAPC ICD-10-CM lookup lists the CPT codes commonly reported with this category.

CPT selection depends on the operative note and payer policy. These pairings reflect common practice patterns rather than mandatory combinations. Prior authorization rules vary by payer and should be confirmed before submission. The CMS Physician Fee Schedule lists current Medicare rates by code.

A nondisplaced dome fracture managed conservatively usually maps to CPT 27220. Open reduction codes are not supported when no manipulation happened, and they will fail an audit. Fixation codes for other sites, such as CPT code 21812, follow the same rule.

Coding guidelines and common errors

The ICD-10-CM Official Guidelines for Coding and Reporting set fracture rules that bear directly on S32.484A. Errors cluster in three fields, namely laterality, displacement, and encounter type. Open fracture claims such as S42.009B carry their own 7th character set. The CDC ICD-10-CM web tool is the official browser for verifying descriptions.

• Error: Using A for follow-up visits. The 7th character must change to D, G, or K once definitive treatment is finished. Billing S32.484A for routine post-op checks is a standard audit target.
• Error: Omitting the external cause code. Guidelines expect a code from V00-Y99 that records how the injury happened. Many commercial payers and Medicare require it.
• Error: Taking laterality from the imaging system. If the radiology report says right but the attending’s note is silent, query the physician. Imaging alone is not enough.
• Error: Submitting S32.484 without a 7th character. The parent code is not billable. Claims carrying it reject at the payer’s front-end edits.
• Excludes notes: The S32 block carries Excludes1 and Excludes2 notes. Never report S32.484A with a code listed as Excludes1 under that block.
• Sequencing: S32.484A is sequenced first as the principal diagnosis. The external cause code follows as an additional code, never as the principal one.

When to use S32.484A vs other acetabulum fracture codes

The S32.4 family covers several anatomical locations and both displacement categories. S32.484A applies only when three conditions hold at once. The fracture must be at the dome, nondisplaced, and on the right side. Practices running sports medicine billing see acetabular injuries in high-impact athletes, where code selection draws close scrutiny.

Dome codes (S32.48) are separate from the wall and column codes. Those cover anterior wall (S32.41), posterior wall (S32.42), anterior column (S32.43), and posterior column (S32.44) fractures. Transverse (S32.45), central (S32.46), and associated (S32.47) fractures each have their own subcategory.

These locations are not interchangeable. Use S32.484A only when the documentation describes a dome fracture of the right acetabulum.

How Pabau keeps acetabular fracture claims accurate

Most orthopedic billing teams check laterality and encounter type by hand. A coder opens the clinical note, the imaging report, and the claim in three places, then hopes nothing drifted between them. That is where the wrong side or a stale 7th character slips through.

Pabau is practice management software that keeps the clinical note and the claim in one record. Charting, imaging notes, and coding sit on the same patient timeline, so the coder reads one source. Claims management then submits the CPT and ICD-10 pairing electronically and tracks it through remittance.

The payoff is fewer reworked claims. Your team spots a missing laterality statement before the claim leaves, not six weeks later in a denial letter. Every Pabau subscription includes the full billing and documentation toolset, so nothing here sits behind a higher tier.

Reduce coding errors on fracture claims

Pabau helps orthopedic, sports medicine, and trauma practices pair codes correctly, document laterality, and submit HIPAA-compliant claims. Fewer denials, less rework.

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Conclusion

Acetabular fracture claims live or die on three fields. Take the side, the displacement, and the encounter type from the physician’s own words, and S32.484A holds up under review.

The trade-off worth remembering is that specificity cuts both ways. A precise code pays cleanly, and it also tells an auditor exactly what your documentation has to prove. So treat an ambiguous note as a query, not a judgment call.

Pabau’s practice management software links diagnosis codes to the right CPT pairing and flags incomplete documentation before submission. Book a demo to see how it handles claims for orthopedic and trauma practices.

Continue your research

Coding a nondisplaced fracture at another site? S52.355J applies the same displacement logic to the shaft of the radius.

Need the 7th character for a malunion? S42.409P shows how the extension changes once healing goes wrong.

Documenting a nonunion after fixation? S42.131K covers the coracoid equivalent and what the note has to prove.

Billing open fixation of a fracture? CPT code 21812 walks through internal fixation documentation for rib fractures.

Coding a late effect rather than active care? S43.491S explains how the sequela extension works on a shoulder injury.

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