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

Key takeaways

ICD-10 code S82.432J covers a displaced oblique fracture of the shaft of the left fibula. The visit is a subsequent encounter for an open type IIIA, IIIB, or IIIC fracture with delayed healing.

S82.432J is a fully billable ICD-10-CM code, effective October 1, 2025 (FY2026). The base code S82.432 is not billable until a 7th character is appended.

Delayed healing is not nonunion. S82.432J applies while union is still progressing slowly, and S82.432N applies once the fracture has stopped healing altogether.

The 7th character also records the wound. J is reserved for open type III, H covers open type I or II, and G covers a closed fracture.

Pabau’s claims management software validates ICD-10 codes through Claim.MD at submission. A missing or mismatched 7th character is caught before the payer sees the claim.

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 delayed healing.

The healing status in that description is delayed healing, not nonunion. The fracture is still moving toward union, only more slowly than the surgeon expected. Once union stops altogether, the encounter belongs to S82.432N instead.

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. Every code in the ICD-10-CM code index is read the same way, from the chapter down to the 7th character.

• 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 a 7th character)
• S82.432J. Displaced oblique fracture of shaft of left fibula, subsequent encounter, open type IIIA/IIIB/IIIC, delayed healing (billable)

Each step down the hierarchy adds specificity. The laterality, left or right, appears at the S82.432 level. The encounter type and the healing status are encoded entirely by the 7th character. Coders who shortcut the hierarchy and jump straight to a sibling code risk picking 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 three variables at once. It records the encounter type, the wound at the time of injury, and, at subsequent encounters, how the fracture is healing. Selecting the wrong extension is one of the most common sources of claim denials on fracture codes.

Category S82 uses the full 16-character set below. Three characters cover initial encounters, twelve cover subsequent encounters, and one covers sequela.

Read the set as a grid rather than a list. The wound runs across it, in three states, closed, open type I or II, and open type III. The healing status runs down it, in four states, routine, delayed, nonunion, and malunion. J is the cell where open type III meets delayed healing. 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 shifts the coder to a different code entirely, and laterality and displacement status are the two that move most often.

• Displaced. The fracture fragments have moved out of normal anatomical alignment. ICD-10-CM guidelines tell coders to default to displaced when the documentation is silent, so an explicit note still reduces audit exposure.
• Oblique. The fracture line runs at an angle across the fibular shaft. That sets it apart from a transverse line, which is perpendicular to the bone axis, and a spiral line, which is helical. The pattern is read off imaging and recorded by the radiologist or the orthopedic surgeon.
• Shaft of the fibula. The fracture sits in the diaphysis, the body of the bone, rather than the proximal or distal end. Fibular shaft fractures often accompany a tibial shaft fracture, but they do present in isolation after lower-energy trauma.
• Left. Laterality is mandatory for every S82 code. A right fibula carries S82.431J instead. Documentation without a stated side should prompt a provider query rather than a guess.

Orthopedic, trauma, and sports medicine practices meet this code pattern after high-energy lower-extremity trauma. It also turns up when an earlier open fracture repair has not healed on schedule.

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

The Gustilo-Anderson classification system sorts open fractures by wound severity and soft-tissue damage. ICD-10-CM groups types IIIA, IIIB, and IIIC under a single set of 7th characters, because the code set does not separate the three subtypes. Clinically the distinction still matters for surgical planning and prognosis.

The three subtypes share one extension. Any Gustilo type III open fracture of the left fibular shaft therefore maps to S82.432J at a subsequent encounter with delayed healing. The documented subtype does not change the character. It does change the surgical narrative and the CPT codes that sit alongside the diagnosis.

What does “subsequent encounter with delayed healing” mean?

Subsequent encounter means the patient is being seen for a fracture that was already treated at an earlier visit. The healing phase is ongoing and the initial encounter has passed. That differs from the sequela extension S, which applies once the fracture has healed and only residual effects remain.

Delayed healing means union is taking longer than expected, while the fracture is still consolidating. Radiographs show callus, but less of it than the interval would predict. Nonunion is the further state, where the fragments have stopped uniting and no healing progression is visible. Malunion is a third state, where the fracture has united in a poor position.

No universal time threshold separates the two. Standard orthopedic references treat a fracture with no radiographic progression after roughly six months as a nonunion candidate. Clinical judgment and payer policy both vary. Until that call is made and documented, a slow-healing open type III left fibular shaft fracture is coded J, not N.

What S82.432J does not cover

Four of the near misses live inside the same subcategory and differ from J by one variable. Three more sit outside S82 altogether, and the tabular list handles them in two different ways.

• A fracture that has stopped healing. Nonunion of the same open type III injury is S82.432N.
• A fracture healed in poor alignment. Malunion of the same injury is S82.432R.
• A slow-healing closed fracture. Closed injuries with delayed healing take S82.432G.
• A slow-healing type I or II wound. Open type I or II injuries with delayed healing take S82.432H.
• The right leg. The mirror-image code is S82.431J.
• Excludes1 at S82. Traumatic amputation of the lower leg (S88.-) is the only Excludes1 note at category S82. It is never reported together with a code from this category.
• Excludes2 at S82. A fracture of the foot except the ankle (S92.-) and a periprosthetic fracture around a prosthetic knee or ankle implant (M97.1-, M97.2-) are Excludes2 notes. A patient can have both conditions, so both codes may appear on the same claim.

A tibial shaft fracture treated at the same encounter is coded separately from category S82.2. Both codes may appear on one claim when both bones are fractured, because ICD-10-CM has no combination code for the pair.

Coding guidelines and documentation requirements

ICD-10-CM Official Guidelines for Coding and Reporting set out several rules that govern S82.432J assignment directly. Working to those rules lowers audit and denial risk on complex fracture accounts.

• Open fracture type must be documented. The treating clinician or surgeon records the Gustilo-Anderson classification, usually at the time of surgical debridement. Radiology reports rarely carry it.
• Encounter type must match the stage of care. Initial-encounter characters apply only while the patient is receiving active treatment for the first time. Subsequent-encounter characters cover the follow-up visits through the healing phase, and S applies after healing is complete.
• Healing status must be stated in clinical terms. A note reading “delayed union” or “healing slower than expected”, or imaging showing reduced callus for the interval, supports the J character. Language pointing to a halt in healing supports N instead.
• Laterality is never assumed. Where the record does not state left or right, query the provider rather than reaching for an unspecified code.
• Additional codes may be required. Code any associated open wound, wound infection, or other complication separately, as directed by the tabular list notes at category S82.
• External cause codes still apply. Fracture encounters carry the applicable external cause code from Chapter 20 for as long as the injury is being actively treated.

Practices can apply these rules automatically with claims software that validates every ICD-10 code at the point of claim creation. A missing 7th character or an incomplete code structure gets flagged before submission. A clearinghouse adds a second layer, checking the diagnosis against payer-specific edits before the claim leaves the practice.

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

S82.432J sits in a dense cluster of sibling codes that each differ by a single variable. Choosing between them means confirming four coding axes, which are laterality, displacement, encounter stage, and healing outcome.

The J versus N distinction deserves the closest attention. Both cover subsequent encounters for an open type III fracture of the same bone at the same site. Only the healing outcome separates them. J says union is still progressing, slower than expected, while N says progression has stopped and the bone is not uniting. Radiology reports and orthopedic notes should state plainly which of the two applies. The Check ICD-10 code lookup tool mirrors official CMS/NCHS data and cross-references sibling codes quickly during a coding review.

Two further codes differ from S82.432J on more than one axis at once. When the note records neither the fracture pattern nor the displacement, the left fibula shaft falls to the unspecified series. S82.402R carries that unspecified fracture at a subsequent encounter for an open type III wound, with malunion instead of delayed healing.

A nondisplaced oblique fracture of the fibula shaft moves out of S82.432 into its own subcategory. S82.434P covers the right side at a subsequent encounter, after a closed injury that healed in poor alignment.

Approximate synonyms and clinical terminology for S82.432J

Several clinical phrasings map to S82.432J in provider documentation. Coders who recognize them land on the right code when the note’s language drifts from the official ICD-10-CM description.

• Displaced oblique fracture of left fibular shaft, subsequent encounter, open type III, delayed healing
• Left fibula shaft oblique fracture with delayed union, subsequent care, open grade III
• Subsequent encounter for left fibula oblique fracture, Gustilo type IIIA/IIIB/IIIC, slow healing
• Delayed union of an open oblique fibula fracture, left, Gustilo type III, follow-up visit
• Left fibular shaft fracture, displaced and oblique, open type III wound, healing behind schedule

Phrases such as “slow to heal”, “delayed union”, or “callus present but sparse for the interval” point to S82.432J. That holds when the wound was type III and the visit is a follow-up.

Wording such as “failed union”, “fracture not healing”, or “no radiographic progression of callus” points to S82.432N instead. An orthopedic follow-up encounter form should carry a field for the Gustilo type and one for the healing status.

CPT codes that pair with an S82.432J diagnosis

S82.432J is a follow-up code, so the procedures billed alongside it are usually assessment and supportive care rather than initial fixation. The two-view tibia and fibula study, 73590, is the code that documents how far union has progressed.

The table below lists the CPT codes that most often accompany a delayed-healing fracture visit. Confirm every one against the current CPT code set, which the American Medical Association maintains and revises each year.

Bone stimulation codes draw payer scrutiny, so keep the medical necessity record tight. Most policies want the interval since injury and the imaging that shows incomplete union. They also want a note on why the surgeon is not yet calling it a nonunion.

Four errors that get S82.432J claims denied

Fracture codes with 7th character extensions are among the most denial-prone categories in orthopedic billing. Four errors account for most of the rework on this code.

Submitting S82.432 with no 7th character

The parent code is invalid on a claim and payers reject it outright. This usually happens when a code is typed from memory rather than picked from the encoder.

Coding J when the note documents nonunion

This is the error the code’s own reputation creates, because J is widely mislabeled as the nonunion character. Nonunion of an open type III left fibular shaft fracture is S82.432N. A J claim against a nonunion note invites a medical necessity denial and an audit finding.

Using an initial-encounter character at a follow-up visit

Characters A, B, and C belong to the first course of active treatment. Once the patient returns for healing-phase care, the claim needs a subsequent-encounter character. Payers match the character against the patient’s claim history and deny the mismatch.

No Gustilo type in the record

J requires a documented type IIIA, IIIB, or IIIC wound. A note that says only “open fracture” supports neither J nor H, so the coder has to query before the claim goes out. Validating the character against the documented wound type is what keeps these claims out of the rework queue.

How Pabau keeps S82.432J claims moving

In most orthopedic practices the healing status lives in free-text notes, and the coder reads the narrative afterward to pick a character. The Gustilo type sits in an operative report from months earlier, in a different part of the chart. A slow-healing fibula then generates a query, a delay, and often a denial.

Practice management software like Pabau closes that loop inside one record. Digital forms capture laterality, Gustilo type, and healing status as structured fields at the follow-up visit. The facts that decide the 7th character then sit on the encounter, not in the middle of a narrative note. The patient’s full fracture history stays on one timeline, which tells the coder immediately whether this visit is initial or subsequent care.

Pabau’s claims management then submits electronically through our Claim.MD integration, with ICD-10 validation and payer-specific edits applied before the claim leaves the practice. Missing 7th characters and invalid parent codes get caught at that point. Electronic remittance through ERA/835 brings the response back into the same record. A claim needing appeal gets identified in days, not at the end of the month.

The outcome is fewer coder queries on fracture follow-ups and fewer resubmissions on open fracture accounts. It also leaves a documentation trail that holds up when a payer asks why the encounter was coded J and not N.

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.

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Conclusion

S82.432J is a fully billable ICD-10-CM code that rests on six documented variables. Those are displacement, the oblique pattern, left laterality, an open Gustilo type IIIA, IIIB, or IIIC wound, a subsequent encounter, and delayed healing. Each one has to appear in the provider’s record for the code to survive an audit.

Delayed healing is all that the character J carries. Nonunion is covered by N, and a closed fracture by the G character. Reading J as nonunion is the most expensive mistake on this code. It puts a claim on record that the clinical note cannot support.

For orthopedic and trauma practices handling a high volume of open fracture follow-ups, structured documentation cuts the coding query burden and speeds up 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

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