ICD-10 code S32.432D: Displaced fracture of anterior column of left acetabulum

Key takeaways

ICD-10 code S32.432D describes a displaced fracture of the anterior column (iliopubic) of the left acetabulum, subsequent encounter for fracture with routine healing.

S32.432D is a billable ICD-10-CM code valid for all HIPAA-covered transactions from October 1, 2025 through September 30, 2026 (FY2026).

The 7th character D is required when the patient is in follow-up care with the fracture healing normally. Using the wrong 7th character (A vs D) is one of the most common denial triggers for pelvic fracture coding.

Pabau’s claims management software helps orthopedic and musculoskeletal practices track encounter type documentation and reduce S32 coding errors at the point of care.

ICD-10 Code S32.432D is a billable code for a displaced fracture of the anterior column (iliopubic) of the left acetabulum. It applies to the subsequent encounter for the fracture, with routine healing. The 7th character determines whether the claim reflects an initial presentation, a follow-up encounter, or a complication. Getting it wrong is a common reason claims in this code family get denied.

The code’s full long descriptor is: Displaced fracture of anterior column [iliopubic] of left acetabulum, subsequent encounter for fracture with routine healing. It is effective for all HIPAA-covered clinical documentation and billing transactions from October 1, 2025 through September 30, 2026, under the FY2026 code year. ICD-10-CM diagnosis codes are maintained by the CDC’s National Center for Health Statistics (NCHS). CMS jointly maintains the code set through the ICD-10 Coordination and Maintenance Committee.

Understanding the 7th character ‘D’ in ICD-10 code S32.432D

The 7th character extension is mandatory for all fracture codes in the S32.432 family. Without it, the code is not billable. Each character defines the type of encounter being documented. Using the wrong one is among the leading causes of claim denials for acetabulum fracture billing.

Character D specifically means the patient is presenting for a follow-up encounter, and the fracture is healing on a normal trajectory. This is distinct from delayed healing, nonunion, or a malunion, each of which requires a different character.

According to the CDC/NCHS ICD-10-CM official tool, the 7th character is not interchangeable between encounter types. Coders must confirm the treating clinician’s documentation explicitly describes the healing status before assigning character D. “Routine follow-up” alone is not sufficient if no healing assessment is recorded.

Anatomy: Anterior column (iliopubic) of the left acetabulum

The acetabulum is the cup-shaped socket in the pelvis that receives the head of the femur to form the hip joint. Fractures to this structure are classified by anatomical column, and accurate coding requires knowing which column is involved. This matters for physical therapy and orthopedic care workflows, where the fracture site determines rehabilitation protocols.

• Anterior column (iliopubic): Extends from the iliac crest anteriorly along the pelvic brim down to the superior pubic ramus. It forms the front wall of the acetabular socket. The bracket notation [iliopubic] in the ICD-10-CM descriptor reflects this dual anatomical identity.
• Posterior column (ilioischial): Runs from the sciatic notch down through the ischium. A fracture here is coded separately (S32.44x series).
• Displaced fracture: The fracture fragments have shifted out of their normal anatomical alignment. This distinguishes S32.432 (displaced) from S32.442 (non-displaced), which carry different clinical management and coding implications.
• Left laterality: The code is specific to the left acetabulum. A right-sided fracture uses S32.431D.

Radiographic and operative reports often describe this injury as “anterior column pelvic ring disruption,” “iliopubic fracture,” or “acetabular wall fracture with anterior column involvement.” Coders should map any of these to the S32.432 family and then assign the correct 7th character based on the encounter type.

Code hierarchy and parent codes for S32.432D

Understanding where S32.432D sits in the ICD-10 diagnosis coding structure helps coders confirm they are working from the correct section of the tabular list. It also ensures they apply the right exclusion notes at each level. The same hierarchy logic applies to sibling injury codes such as S31.142S.

Note that S32.432 (without the 7th character) is not billable on its own. Payers reject claims submitted with the truncated stem code. The full 7-character code is required for all HIPAA-covered transactions.

Related and sibling acetabulum fracture ICD-10 codes

S32.432D sits within a family of closely related codes. Selecting the right one depends on laterality, displacement status, and encounter type. The table below covers the most commonly referenced siblings, and the same selection logic extends to nearby pelvis injury codes such as S31.829A.

Use the AAPC ICD-10-CM code lookup to verify sibling codes and confirm their current FY2026 billable status before submitting claims.

Clinical documentation requirements for S32.432D

Five documentation elements must be present in the medical record to support ICD-10 Code S32.432D. Missing any one of them leaves the claim open to denial or downcoding.

Pabau’s claims management software supports clinical documentation and patient records workflows that capture these elements at the point of care. This reduces the back-and-forth between coders and treating providers at claims submission.

The ICD-10-CM Official Guidelines for Coding and Reporting (Section I.C.19) require that all specificity elements be documentable from the medical record. Coders should not infer laterality or displacement from context alone.

DRG assignment and inpatient billing for pelvic fractures

For inpatient encounters, ICD-10 Code S32.432D maps into the MS-DRG v43.0 (FY2026) system published by CMS. The specific DRG assignment depends on whether a complication or comorbidity (CC) or major complication or comorbidity (MCC) is present. Pelvic fracture codes in the S32 category typically group under MDC 8 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue).

The ICD list tool at ICD List provides DRG grouper functionality that helps coders verify specific DRG assignments for S32.432D combinations before submission. Running a periodic medical chart audit and confirming the MS-DRG grouping before the claim is submitted reduces the risk of post-payment reviews.

Orthopedic and trauma practices manage high volumes of pelvic fracture encounters. Patient data management across clinical workflows should track encounter type and healing status across serial visits, not just at the initial encounter.

Approximate synonyms and clinical terminology for S32.432D

Operative notes, radiology reports, and discharge summaries use various terms that all map to ICD-10 Code S32.432D when coded correctly. Knowing these clinical synonyms helps coders identify the right code without needing to query the treating provider in most cases. This vocabulary is also useful for sports medicine and orthopedic practice management teams reviewing documentation quality.

• Displaced left acetabular fracture, anterior column, follow-up
• Left iliopubic column fracture, subsequent care, routine healing
• Left anterior acetabulum fracture, displaced, follow-up encounter
• Left hip socket fracture, anterior column, post-operative follow-up (where healing is on track)
• Displaced fracture of the iliopubic column of the left acetabulum, subsequent encounter
• Left acetabular anterior wall fracture with displacement, follow-up (if anterior wall is part of the anterior column complex per the operative note)

Terms like “left hip fracture” or “pelvic ring injury” are not specific enough to support S32.432D on their own. Coders need additional documentation confirming the acetabular column, displacement status, and encounter type. Source documentation should guide the code, not the chief complaint alone. For practices adopting orthopedic EMR software, templated clinical notes that prompt for laterality and fracture site at each follow-up visit significantly reduce coding queries.

How Pabau reduces fracture coding queries and denials

Most orthopedic practices catch a missing laterality, displacement, or healing status detail only after a claim comes back denied. Coders query the provider, the provider checks the chart, and the note gets amended days after the visit.

Practice management software like Pabau builds these five elements into the encounter template itself. The clinician records laterality, fracture site, displacement, encounter type, and healing status before the visit closes. Pabau’s claims management software then carries that structured data straight through to the claim.

For orthopedic and musculoskeletal practices, that means fewer provider queries per claim and fewer S32.432-family denials tied to an incomplete 7th character.

Reduce coding queries with structured clinical documentation

Pabau helps orthopedic and musculoskeletal practices capture laterality, displacement, and healing status at every encounter, cutting the documentation errors that lead to fracture code denials.

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Conclusion

Accurate coding for displaced acetabulum fractures hinges on getting the 7th character right and ensuring all five documentation elements are present in the record. For S32.432D, that means confirming left laterality, anterior column site, displacement, a subsequent encounter, and documented routine healing before the claim goes out.

Practices that build structured follow-up note templates around these five elements see fewer coding queries and faster reimbursement on pelvic fracture claims. If you want to see how Pabau’s claims management tools support documentation completeness across orthopedic and musculoskeletal workflows, book a demo to explore the platform.

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