ICD code S82.432J – Displaced oblique fracture of shaft of left fibula

Key Takeaways

ICD-10 code S82.432J describes a displaced oblique fracture of the shaft of the left fibula, coded at a subsequent encounter where an open type IIIA, IIIB, or IIIC fracture has resulted in nonunion

S82.432J is a fully billable ICD-10-CM code, effective October 1, 2025 (FY2026); the base code S82.432 without a 7th character is not billable

The J suffix distinguishes nonunion from delayed healing (G suffix) and from closed-fracture nonunion (K/M/N suffixes), making accurate 7th character selection critical to avoid claim denials

Pabau’s claims management software integrates with Claim.MD to validate ICD-10 codes at submission, reducing denials on complex fracture encounters

ICD-10 code S82.432J: full description and billable status

S82.432J is a valid, billable ICD-10-CM diagnosis code for fiscal year 2026. It became effective October 1, 2025 and applies to claims with dates of service on or after that date. The full description reads: Displaced oblique fracture of shaft of left fibula, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with nonunion.

The base code S82.432, without any 7th character extension, is not billable. Coders must always append a valid 7th character before submitting. Confirm the current code against the CDC/NCHS ICD-10-CM web tool or the CMS ICD-10 codes page for the applicable fiscal year before billing.

Code hierarchy: where S82.432J sits in ICD-10-CM

Understanding the parent code chain clarifies which coding rules apply at each level. S82.432J inherits documentation and sequencing requirements from every level above it. Accurate ICD-10 coding for musculoskeletal conditions always starts with confirming the full hierarchy before selecting the specific code.

• Chapter 19: Injury, poisoning and certain other consequences of external causes (S00-T88)
• Block S80-S89: Injuries to the knee and lower leg
• Category S82: Fracture of lower leg, including ankle
• Subcategory S82.4: Fracture of shaft of fibula
• S82.43: Oblique fracture of shaft of fibula
• S82.432: Displaced oblique fracture of shaft of left fibula (non-billable without 7th character)
• S82.432J: Displaced oblique fracture of shaft of left fibula, subsequent encounter, open type IIIA/IIIB/IIIC, nonunion (billable)

Each step down the hierarchy adds specificity. The laterality (left vs right) appears at the S82.432 level. The encounter type and healing status are encoded entirely by the 7th character. Coders who shortcut the hierarchy and jump directly to a sibling code risk selecting the wrong laterality or the wrong fracture pattern.

Understanding the 7th character extensions for S82.432

S82.432 requires a 7th character extension to become billable. The extension encodes two variables simultaneously: the encounter type (initial, subsequent, or sequela) and, for subsequent encounters, the fracture healing status. Selecting the wrong extension is one of the most common sources of claim denials on fracture codes. Getting 7th character extension rules right is foundational to clean claims across all ICD-10 fracture categories.

The J suffix is specific to open fractures classified as Gustilo type IIIA, IIIB, or IIIC where nonunion has occurred. It does not apply to delayed healing (use H for open type I/II delayed healing or the J suffix within a different open-type grouping). Verify extension options against the AAPC ICD-10-CM lookup to confirm all valid characters for the specific fiscal year before submitting.

Clinical meaning: displaced oblique fracture of the left fibula shaft

Each word in the code description carries clinical and coding weight. Misreading any component, particularly laterality or fracture displacement status, shifts the coder to a different code entirely.

• Displaced: The fracture fragments have moved out of normal anatomical alignment. Coding guidelines require coders to default to “displaced” when documentation does not specify; however, for accurate S82.432J assignment the provider’s documentation must explicitly describe or imply displacement.
• Oblique: The fracture line runs at an angle across the fibular shaft, as opposed to transverse (perpendicular to the bone axis) or spiral (helical). Oblique pattern is determined by imaging and recorded in the radiologist or orthopaedic surgeon’s report.
• Shaft of the fibula: The fracture is located in the diaphysis (shaft/body) of the fibula, not the proximal or distal end. Shaft fractures of the fibula often occur alongside tibial shaft fractures but can present in isolation, particularly in lower-energy trauma.
• Left: Laterality is mandatory for all S82 codes. Right fibula fractures use S82.431J. Coding without documented laterality should prompt a query to the provider before submission.

Orthopaedic and trauma clinics, as well as clinicians working in sports medicine software environments, will frequently encounter this code pattern following high-energy lower-extremity trauma or complications from prior open fracture treatment.

What is a Gustilo type IIIA, IIIB, or IIIC open fracture?

The Gustilo-Anderson classification system categorises open fractures by wound severity and soft-tissue damage. ICD-10-CM groups Types IIIA, IIIB, and IIIC together under a single set of 7th character extensions because the coding system does not require distinction between these three subtypes at the code level. Clinically, the distinction remains important for surgical planning and prognosis.

Because ICD-10-CM does not differentiate between the three subtypes at the code extension level, any Gustilo type III open fracture of the left fibula shaft coded at a subsequent nonunion encounter maps to S82.432J regardless of which IIIA, IIIB, or IIIC subtype was documented.

What does “subsequent encounter with nonunion” mean?

Subsequent encounter means the patient is receiving care for a fracture that was already treated at a prior encounter. The active phase of treatment is ongoing, but the initial encounter has already occurred. This contrasts with the sequela extension (S), which is used when the fracture has healed but residual effects remain.

Nonunion specifically means the fracture fragments have failed to unite. There is no defined universal timeframe, but per standard orthopaedic references, a fracture that shows no radiographic evidence of healing progression after a minimum of six months is generally considered a candidate for a nonunion diagnosis, though clinical judgment and payer policies vary. Nonunion is different from delayed healing (fracture still progressing toward union but more slowly than expected) and malunion (fracture healed but in a malpositioned alignment). These distinctions determine which 7th character applies.

Coding guidelines and documentation requirements

ICD-10-CM Official Guidelines for Coding and Reporting provide several rules that directly govern S82.432J assignment. Staying aligned with these guidelines supports medical billing compliance and reduces the risk of audits or denials on complex fracture accounts.

• Laterality is mandatory: Documentation must specify left or right. If not stated, query the provider rather than defaulting to an unspecified code.
• Fracture displacement must be documented: Coders default to “displaced” when documentation is silent per ICD-10-CM guidelines, but explicit documentation reduces audit risk.
• Open fracture type must be documented: The treating clinician or surgeon must record the Gustilo-Anderson classification. Radiology alone typically does not provide this classification; it is usually assigned at time of surgical debridement.
• Encounter type must align with care stage: Use A (initial encounter) only when the patient is receiving active treatment for the fracture for the first time. Use subsequent encounter codes for all follow-up visits during the healing phase. Use sequela (S) only after healing is complete.
• Nonunion requires clinical or radiographic documentation: A note stating “fracture with nonunion” or imaging demonstrating absence of bridging callus supports the J extension. ICD-10-CM guidelines do not require a specific time threshold in the documentation, but clinical specificity reduces query volume.
• Additional codes may be required: Code any associated open wound, wound infection, or other complications separately as directed by the ICD-10-CM tabular list notes for category S82.

Practices using claims management software can automate ICD-10 validation at the point of claim creation, catching missing 7th characters and incomplete code structures before submission. Integrating with a clearinghouse through Claim.MD clearinghouse integration adds a second validation layer, checking diagnosis codes against payer-specific edits before the claim leaves the practice. Understanding medical billing workflows for complex fracture encounters helps teams structure their documentation and claims queue efficiently.

Reduce claim denials on complex fracture codes

Pabau integrates with Claim.MD to validate ICD-10 diagnosis codes before submission. Catch missing 7th characters, incomplete codes, and payer edits automatically, so your team spends less time on rework and more time on patient care.

Book a demo

S82.432J vs related fibula fracture ICD-10 sibling codes

S82.432J sits among a dense cluster of sibling codes that differ by only one variable. Knowing which code applies requires confirming all four coding axes: laterality, displacement, encounter stage, and healing outcome. Reviewing accurate diagnosis code selection practices across all ICD-10 categories reinforces the importance of this systematic approach.

The H vs J distinction deserves particular attention. Both involve subsequent encounters for open type III fractures of the same bone at the same anatomical location. The sole difference is healing status: H indicates the fracture is still progressing toward healing but more slowly than expected, while J indicates progression has stopped entirely and union is not occurring. Radiology reports and orthopaedic clinical notes should clearly describe which of these two situations applies. The Check ICD-10 code lookup tool mirrors official CMS/NCHS data and can be used to cross-reference sibling codes quickly during a coding review.

Approximate synonyms and clinical terminology for S82.432J

Multiple clinical terms map to S82.432J in provider documentation. Coders should recognise these synonyms to correctly identify the applicable code when documentation language varies from standard ICD-10-CM descriptions.

• Displaced oblique fracture of left fibular shaft, subsequent encounter, open type III, nonunion
• Left fibula shaft oblique fracture with nonunion (subsequent care, open grade III)
• Subsequent encounter for left fibula oblique fracture, Gustilo type IIIA/IIIB/IIIC, failure to heal
• Nonunion of open oblique fibula fracture, left, Gustilo type III, follow-up visit
• Left fibular shaft fracture (displaced, oblique) complication: nonunion, open wound type III

When documentation uses terms like “failed healing,” “fracture not healing,” or “no radiographic progression of callus” alongside open type III fracture language for the left fibula, these point toward S82.432J for a subsequent encounter visit. Practices managing superbill documentation for orthopaedic follow-up should ensure the superbill includes both the Gustilo type and healing status fields to support consistent code assignment. Workflow queries for submitting claims via clearinghouse platforms benefit from having this level of documentation granularity built into the encounter form.

Billing, claims, and denial management for S82.432J

Fracture codes with complex 7th character extensions are among the most denial-prone categories in orthopaedic billing. The primary denial triggers for S82.432J claims include mismatched encounter type, missing Gustilo classification documentation, and incorrect healing status selection.

Common denial patterns and their resolutions for S82.432J claims include claims rejected for using an initial encounter code (A suffix) on a follow-up visit, claims denied because the provider note did not specify a Gustilo type, and medical necessity denials where nonunion was not supported by imaging documentation. Structured denial management strategies for fracture code categories start with pre-submission validation of the 7th character against the documented clinical facts.

Practices that route S82.432J claims through a clearinghouse with real-time eligibility checking and CPT-ICD-10 validation catch these issues before the payer sees the claim. Pabau’s integration with Claim.MD, accessible at pabau.com/integrations/claim-md/, supports 837P electronic claim submission with built-in ICD-10 code validation across more than 4,000 US payers. Receiving electronic remittance through ERA/835 workflows also enables faster identification when nonunion claims require appeal with additional documentation.

Conclusion

S82.432J is a precise, fully billable ICD-10-CM code that requires accurate documentation of five clinical variables: displacement, oblique fracture pattern, left laterality, open Gustilo type IIIA/IIIB/IIIC, subsequent encounter, and nonunion. Each variable must appear in the provider’s record to support the code at audit. The 7th character J is not interchangeable with G (delayed healing) or K (closed nonunion), and using the wrong suffix is a frequent cause of claim rework.

For orthopaedic and trauma practices handling a high volume of open fracture follow-ups, building structured documentation workflows reduces the coding query burden and supports faster claim submission. To see how Pabau supports ICD-10 code validation and claim submission for complex fracture encounters, book a demo with the Pabau team.

Continue your research

Need to understand how ICD-10 coding affects your revenue cycle? What is revenue cycle management explains how diagnosis code accuracy connects to payment timelines and denial rates.

Managing insurance claims for orthopaedic encounters? Clean claim submission guidelines outlines the key components that prevent rejections before claims reach the payer.

Looking for structured intake and documentation for trauma follow-ups? Digital intake forms in Pabau allow practices to capture Gustilo classification, healing status, and laterality at the point of care.

Frequently Asked Questions