ICD-10 Code S32.411A: Displaced fracture of anterior wall of right acetabulum

Key takeaways

S32.411A is a billable ICD-10-CM code for displaced fracture of anterior wall of right acetabulum, initial encounter for closed fracture, valid for FY2026.

The 7th character ‘A’ designates initial encounter for closed fracture; subsequent encounters use D (routine healing), G (delayed healing), or S (sequela).

Documentation must specify four elements: laterality, displacement status, fracture wall, and encounter type. Missing any one of them can trigger a claim denial.

S32.412A is the displaced left acetabulum, not the non-displaced right one, and mixing the two produces a laterality mismatch denial.

Practice management software like Pabau supports ICD-10-CM claim submission and remittance tracking through its Claim.MD integration.

ICD-10 code S32.411A: Definition and clinical description

ICD-10 code S32.411A is a billable, specific ICD-10-CM diagnosis code.

The CDC/NCHS ICD-10-CM web tool publishes its full official description as Displaced fracture of anterior wall of right acetabulum, initial encounter for closed fracture. The 2026 edition took effect on October 1, 2025 under FY2026 ICD-10-CM.

This page covers the code hierarchy, the valid 7th characters, and the four documentation elements a coder needs. It then works through the related S32.4 codes and the mistakes that generate denials.

S32.411A code details and hierarchy

S32.411A sits four levels down the ICD-10-CM tabular list. Seeing the full hierarchy laid out makes it clear why none of the parent codes can be billed on their own.

S32.411 without a 7th character is not valid for claim submission. The CMS ICD-10-CM code files confirm that codes in this series need a 7th character extension before they become billable.

How to choose the 7th character

The S32.411 base code has four valid 7th character extensions. Each one reflects a specific clinical phase of care, and picking the wrong one is a common denial trigger on orthopedic fracture claims.

Per ICD-10-CM Official Guidelines Section I.C.19, the default assumption when physician documentation does not specify open or closed is closed fracture. So 7th character A is the appropriate selection when a physician’s notes describe a fracture without qualifying it as open. Coders should not assume open status without explicit documentation.

Documentation requirements for coding S32.411A

Claim denials for acetabular fracture codes almost always trace back to incomplete physician documentation. Four elements must be present before a coder can confidently assign S32.411A.

1. Laterality: The note must specify the right acetabulum. “Acetabular fracture” without a side is insufficient. The coder has to query the physician rather than assume.
2. Displacement status: The note must confirm the fracture is displaced. Imaging reports alone are not always enough. The physician’s diagnosis statement is what has to reflect displacement.
3. Fracture wall: The note must identify the anterior wall specifically. Acetabulum fractures can involve the anterior wall, posterior wall, anterior column, posterior column, or medial wall. Each maps to a different code family.
4. Encounter type and open vs closed: The note must clarify whether this is an initial encounter, subsequent encounter, or sequela. For initial encounters, open vs closed status determines the 7th character. Document it explicitly or the coder has to apply the closed default.

Each of those elements controls a specific character position in the code. That is why one missing detail changes which code you submit, rather than just weakening the note.

Payer remittance reports are the fastest way to see which of the four elements your physicians skip most often. Log the denial reason code against the note that produced it, and the pattern shows up within a quarter.

Displaced vs non-displaced anterior wall fractures

The most costly error on right acetabular anterior wall fractures is confusing the displaced and non-displaced codes. A common misconception holds that S32.412A is the non-displaced counterpart to S32.411A. It is not.

S32.412A is the displaced fracture of the anterior wall of the LEFT acetabulum. The non-displaced fracture of the anterior wall of the RIGHT acetabulum is S32.414A. Submitting S32.412A when you mean S32.414A creates a laterality mismatch that payers will flag.

Confirm both the side and the displacement status from the operative or ED note before selecting the code. Imaging reports often note displacement, but the physician’s diagnosis statement is the authoritative source for coding.

Related ICD-10 codes for acetabular fractures

The S32.4 subcategory covers every acetabular fracture. Coders working orthopedic or trauma cases meet these codes alongside S32.411A regularly. The wider ICD-10-CM code set applies the same specificity logic in every chapter, so the habits transfer.

Coders in orthopedics and rehabilitation should know the full S32.4 range. Subsequent encounter coding with the D and G extensions draws on exactly the same wall and laterality detail as the initial claim.

Initial encounter vs subsequent encounter vs sequela

The split between initial encounter (A), subsequent encounter (D or G), and sequela (S) is one of the most misapplied concepts in trauma coding. The terminology is counterintuitive. “Initial encounter” does not mean the patient’s first visit to a provider, it means the patient is still in the active treatment phase.

• Initial encounter (A): Use while the patient is receiving active treatment. That includes emergency department visits, surgical repair, open reduction internal fixation, closed reduction, and any encounter where definitive treatment decisions get made. Multiple visits can carry 7th character A as long as active treatment continues.
• Subsequent encounter (D or G): Use once the patient has moved to routine care or monitoring. Physical therapy visits, cast changes, and follow-up imaging during the healing phase all take D (routine healing) or G (delayed healing). The shift from A to D happens when the fracture is no longer being managed with new interventions.
• Sequela (S): Use for late effects that arise after the fracture has healed. Post-traumatic arthritis of the hip joint following a healed anterior wall fracture is the classic example. The sequela code S32.411S is reported second. The nature of the sequela, such as post-traumatic arthritis of the right hip, comes first.

The 7th character is read off the encounter in front of you, not off the patient’s history with the practice. A patient on their fourth visit can still be an initial encounter if surgery is still on the table.

Alphabetic index terms and synonyms

Coders who search by clinical description rather than code number need to know which terms the ICD-10-CM alphabetic index maps to S32.411A. The following terms all lead to this code in the tabular list.

• Right acetabular anterior wall fracture, displaced, initial encounter
• Displaced fracture of anterior wall of right acetabulum
• Right acetabulum anterior wall fracture, closed, initial
• Fracture, acetabulum, anterior wall, right, displaced
• Traumatic fracture, right acetabular anterior wall (initial, closed)

These synonyms also appear in coding software keyword searches, so they help coders confirm they have landed on the correct code. Searching “anterior wall right acetabulum displaced” in a compliant lookup tool should return S32.411A first for initial encounters.

ICD-10-CM guidelines that apply to this code

Several sections of the ICD-10-CM Official Guidelines apply directly to S32.411A. The AAPC Codify ICD-10-CM lookup surfaces them under coding guidelines for the code.

• Section I.C.19.a (traumatic fractures): Traumatic fractures take the appropriate 7th character for initial versus subsequent encounter. A fracture not indicated as open or closed is coded as closed.
• External cause codes (mandatory): An additional code from the external cause chapter must be reported alongside S32.411A to identify how the fracture happened. Examples include W19 for an unspecified fall and V09 for a pedestrian injury. This is not optional.
• Sequencing: When S32.411A is the principal diagnosis, it is sequenced first. When it is a secondary diagnosis, such as a fracture found while treating another condition, the sequencing rules in Section II apply.
• S32 chapter notes: A fracture of the pelvis is coded to the most specific level available. Using S32.401A when the anterior wall is documented is undercoding, and it may draw a payer query on audit.

Embed these rules in the coding workflow rather than leaving them to memory. A pre-submission scrub that checks for a missing 7th character and an absent external cause code catches most of the guideline failures above.

Common coding errors and how to avoid them

These are the mistakes that generate the most denials on right acetabular anterior wall fracture claims.

• Missing 7th character: Submitting S32.411 without the A, D, G, or S extension. This is an invalid code and gets rejected at the clearinghouse before it reaches the payer.
• Confusing S32.412A with the non-displaced right: S32.412A is displaced, left side. The non-displaced right anterior wall fracture is S32.414A. This mix-up generates a laterality mismatch denial that takes weeks to correct.
• Using the wrong encounter type: Continuing to submit 7th character A for follow-up visits after the patient has moved into routine healing. Once active treatment ends, switch to D. Overuse of A draws payer audits on high-volume orthopedic practices.
• Using S32.401A instead of S32.411A: Coding the unspecified acetabulum code when the note clearly specifies the anterior wall. This is undercoding, and it can affect coverage determination on some Medicare Advantage plans.
• Omitting the external cause code: Leaving out the external cause code alongside S32.411A. ICD-10-CM guidelines require it. The omission will not always trigger an immediate denial, but it creates compliance exposure on audit.

Solid denial management is the practical backstop for all five. Log the denial reason code and trace it back to the missing documentation. Then fix it at the source rather than reworking claims one at a time.

How claims management software prevents acetabular fracture denials

In most orthopedic practices, a bad fracture code gets caught by the payer rather than by the practice. The coder reworks the claim, resubmits, and waits another cycle for payment. A laterality mismatch on a single acetabular claim can hold up reimbursement for weeks.

Practice management software like Pabau moves that check earlier. Our claims management software keeps the ICD-10-CM catalog inside the claim screen. A coder who picks S32.411 sees the valid 7th characters before the claim goes out, so an incomplete code never reaches the clearinghouse.

Eligibility checks and electronic remittance tracking run in the same place, through our Claim.MD integration. So the claims that do come back carry a remittance record you can trace to the encounter that caused it. That is what turns a denial into a documentation fix instead of a rework.

Streamline orthopedic claim submissions

Pabau integrates with Claim.MD to support ICD-10-CM claim submission, real-time eligibility checks, and electronic remittance tracking for orthopedic and trauma practices.

Book a demo

Conclusion

S32.411A rewards precision in the note more than fluency with the code book. If the physician records side, displacement, wall, and encounter type, the code follows in seconds.

So the fix worth making sits upstream, in the note template rather than the coder’s checklist. A practice that changes the template stops paying twice a quarter for the same laterality mismatch. The trade-off is a slightly longer note, and it buys back the rework cycle every time.

Book a demo to see how Pabau validates diagnosis codes before an orthopedic claim ever reaches the payer.

Continue your research

Need a clearinghouse submission walkthrough? Medical claims clearinghouse guide covers how claims move from EHR through clearinghouse to payer, including ICD-10-CM validation steps.

Want to understand denial reason codes? Denial codes in medical billing explains the CARC codes that appear when fracture claims are rejected for an invalid diagnosis code.

Looking to verify codes before submission? Superbill best practices outlines how to structure encounter documentation so code selection holds up on the first pass.

Frequently asked questions