ICD code S82.434P – Nondisplaced oblique right fibula shaft fracture

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Key takeaways

S82.434P is the billable ICD-10-CM code for a nondisplaced oblique fracture of the right fibula shaft that has united with malunion.

The seventh character P means subsequent encounter for closed fracture with malunion. It does not mean sequela, and sequela for this fracture is S82.434S.

P, Q and R all describe malunion. Fracture type separates them: P is closed, Q is open type I or II, and R is open type IIIA, IIIB or IIIC.

S82.434P can be reported as the first-listed diagnosis. The sequencing rule that puts a residual condition first belongs to sequela codes, not to P.

Denials cluster around three errors: D left in place after malunion is documented, K confused with P, and an open fracture coded as closed.

ICD-10 Code S82.434P: Definition, billability, and code structure

ICD-10 Code S82.434P is a billable, specific ICD-10-CM diagnosis code. Its full official descriptor is Nondisplaced oblique fracture of shaft of right fibula, subsequent encounter for closed fracture with malunion.

The code is valid for claim submission in the current fiscal year under the CDC/NCHS ICD-10-CM system. The base code S82.434 is not billable on its own, because a fracture code in this category needs a seventh character.

Breaking the code down segment by segment helps coders avoid misassignment. Each character carries a specific anatomical or encounter meaning. A single wrong character produces a different clinical statement on the claim.

The code sits within the broader ICD-10-CM framework that governs trauma and injury reporting. Knowing the hierarchy prevents the most common mistake on this family. Payers accept only the seven-character code, so S82.434 and S82.43 are rejected on a claim.

Clinical description: Nondisplaced oblique fracture of the right fibula shaft

In a nondisplaced oblique fracture of the fibula shaft, the fracture line runs diagonally across the bone at an angle. The fractured ends stay in acceptable anatomical alignment, without significant separation. That is the feature separating it from displaced variants coded under S82.431 (right) or S82.432 (left).

The fibula shaft, also called the diaphysis, runs along the lateral aspect of the lower leg. Fractures here differ from ankle fractures (coded under S82.6xx) and fibula head or neck fractures (S82.1xx). The right-side laterality in S82.434P is fixed, so coders must verify the side explicitly from the operative or clinical note before submission.

The seventh character P changes what the encounter is about. The fracture line has united, but it united in a position that is off anatomical alignment. That outcome is malunion. The patient is still in the healing and recovery phase for the same injury. That is why the encounter is a subsequent one rather than a late effect.

Understanding the seventh character: What P means in fracture coding

The seventh character on an S82.434 code states three facts at once: the encounter type, the fracture type, and the healing outcome. Choosing it wrongly is the most common reason a fibula fracture claim is denied.

P is frequently misread as sequela. P means subsequent encounter for closed fracture with malunion. Sequela is carried by a different character, giving the code S82.434S. CMS sets out the full seventh-character set in its ICD-10-CM coding guidelines under Section I.C.19.

P, Q and R all describe malunion, and only the fracture type separates them. P is the closed injury that healed crooked. Q and R cover open injuries, graded under the Gustilo-Anderson system. Coding P for an open grade III injury puts the claim at odds with the operative report. Two questions settle the character, and the chart below walks through both.

There is no fixed interval after the injury at which P becomes correct. ICD-10-CM sets no timeframe for any of the subsequent-encounter characters. What triggers P is a clinical finding. The provider has documented union in a malaligned position on a closed fracture.

Complete S82.434 seventh character reference

All sixteen variants share the same base code, S82.434 (nondisplaced oblique fracture of shaft of right fibula). They differ by encounter status, fracture type, and healing outcome. Every one of them is billable.

Laterality and displacement sit in the fifth and sixth characters, not the seventh. S82.431P covers the displaced right variant, S82.435P the nondisplaced left variant, and S82.436P the unspecified side. Use S82.436P only when the record genuinely does not state a side.

When to use ICD-10 Code S82.434P: Clinical scenarios

S82.434P fits a narrow set of follow-up encounters. Each one needs documentation tying the visit to a closed, nondisplaced oblique fracture of the right fibula shaft that has united out of alignment.

• Post-union deformity confirmed on imaging: X-ray or CT shows the fracture united with angulation, rotation, or shortening, and the provider names the result as malunion.
• Follow-up visit for a documented malunion: The patient returns for assessment of the malunited right fibula. No new injury is involved and no fresh fracture care is starting.
• Surgical planning for malunion correction: The visit evaluates the patient for osteotomy or realignment of the malunited fibula shaft.
• Brace or therapy management after malunion is identified: Routine care continues through the recovery phase, with malunion recorded as the healing outcome.
• Hardware assessment after fixation: The patient is reviewed for implant position or removal, and the record confirms union in a malaligned position.

S82.434P may be reported as the first-listed diagnosis. It describes the current condition itself, so nothing has to precede it on the claim. The sequencing rule that puts a residual condition ahead of the injury code belongs to sequela codes such as S82.434S. Do not reach for an aftercare Z code either, because ICD-10-CM directs coders to report the fracture code with the correct seventh character instead.

What this code excludes: Scenarios that need a different code

S82.434P is narrow in scope. Several neighboring scenarios fall outside it and require different codes entirely.

• Initial treatment of the fracture: Use S82.434A for the first encounter for active treatment of the closed fracture.
• Routine or delayed healing: Use S82.434D for routine healing and S82.434G for delayed healing. Neither describes a bone that has united out of alignment.
• Nonunion: Use S82.434K. Nonunion means the bone ends never united, while malunion means they united in the wrong position.
• Sequela of the fracture: Use S82.434S once the fracture episode is over and a late effect, such as post-traumatic arthritis, is the treatment target.
• Open fractures with malunion: Use S82.434Q for open type I or II injuries and S82.434R for open type IIIA, IIIB, or IIIC injuries.
• Displaced or left-sided fractures: S82.431P covers the displaced right variant and S82.435P the nondisplaced left variant. Laterality errors produce rejections and, potentially, audit flags.
• Fibula head and neck fractures: Coded under S82.1xx, anatomically separate from the shaft and not covered by S82.434P.
• Ankle fractures involving the fibula: Coded under S82.6xx. The distal fibula at the ankle is a distinct anatomical zone.
• Peroneal nerve injuries: Coded separately under S84.1xx. A malunion that compresses the nerve needs both S82.434P and the nerve code.

Documentation requirements to support S82.434P

Ambiguous documentation is the fastest route to a denial on S82.434P. Orthopedic and physical therapy records should carry all five elements below before the code is submitted.

• Malunion stated in the record: The provider must document that the fracture united in a malaligned position. Imaging findings of angulation, rotation, or shortening support that statement.
• Closed fracture confirmed: The original injury must be recorded as closed. An open injury moves the code to S82.434Q or S82.434R.
• Laterality confirmed as right: The record must name the right side. “Lower leg fracture” without a side is not sufficient.
• Fracture pattern documented: The chart should identify the fracture as nondisplaced and oblique at the fibula shaft. A bare “fibula fracture” may not survive an audit.
• Encounter type identified: The note must show this is a follow-up during the healing or recovery phase, not the first encounter for active treatment.

Practices using structured clinical note templates capture these five elements more consistently. That lowers the documentation-related denial rate on fracture follow-up claims.

Pairing S82.434P with CPT procedure codes

CPT selection on an S82.434P claim must match the work done for the malunion, not the work that treated the original fracture. A cleaner claims management workflow confirms CPT-to-ICD-10 medical necessity before each submission. The AAPC ICD-10-CM code range lookup is useful for crosswalk checks.

One pairing trips coders up repeatedly. CPT 27720, 27722 and 27724 describe repair of nonunion or malunion of the tibia, not the fibula. Billing them against S82.434P alone creates a mismatch between the procedure and the diagnosis, so pair them with the relevant tibial diagnosis code.

CPT choice depends on the operative note and the surgeon’s attestation. Verify every code against the current AMA CPT manual before submission. Make the CPT-to-ICD-10 crosswalk a standard pre-submission step on every malunion claim.

Payer requirements and pre-authorization for malunion claims

Medicare applies Local Coverage Determinations (LCDs) to most surgical procedures used to correct a fracture malunion. Which LCD governs a specific claim depends on the MAC jurisdiction covering the practice’s service area, so payer rules cannot be stated as universal absolutes. Review the applicable CMS Physician Fee Schedule for current reimbursement data and LCD links.

S82.434P does not carry the sequencing restriction that applies to sequela codes. It can lead the claim when the malunion is the reason for the visit. Routing the claim through clearinghouse claim submission lets a practice validate code pairs before the payer sees them. The remittance data coming back then shows which payers reject fracture follow-up claims, and why.

• Pre-authorization for surgical correction: Most commercial payers and Medicare Advantage plans require prior authorization for fibula osteotomy. The request should include imaging reports, a functional assessment, and the proposed CPT code alongside S82.434P.
• Medical necessity thresholds: Medicare generally expects imaging that confirms malunion, plus a functional assessment showing the deformity limits the patient’s activity. A note describing pain alone rarely meets the threshold.
• Seventh-character consistency across the episode: Payer edits compare the current claim against earlier claims for the same injury. A jump from S82.434D to S82.434P without documented malunion draws scrutiny.

Coding guidance: Choosing between S82.434D, K, P, and S

These four characters cover the same right fibula fracture at different points in its course. The distinction is clinical rather than clerical. The coder needs to know what the bone has done before picking a seventh character.

Time elapsed does not decide the character. Union status and alignment do. Without a note on alignment, a “fracture follow-up” entry gives the coder no basis for the P character. Query the provider instead of defaulting to the D character.

Common claim denial reasons for S82.434P

Claims submitted with S82.434P fail for predictable, preventable reasons. Review denial codes in medical billing to see how payers communicate each rejection type. Then build the matching fix into your pre-submission workflow.

• D used after malunion is documented: The visit is labeled fracture follow-up, so the coder reaches for D out of habit. Once the record states malunion, D is wrong.
• K used for malunion: K covers nonunion, where the bone never united. Malunion means union in the wrong position, which is P.
• S used instead of P: S is the sequela character. It applies only once the fracture episode has closed and a late effect is the treatment target.
• Open fracture coded as closed: If the original injury was open, the correct character is Q or R, depending on the Gustilo-Anderson grade.
• Laterality error: S82.435P covers the left side. Submitting it for a right-sided fracture creates a contradiction that payer edits catch automatically.
• Displacement mismatch: S82.431P covers the displaced right variant. Check the original fracture classification before choosing between S82.431 and S82.434.
• Aftercare Z code submitted: Aftercare codes do not apply to traumatic fractures. Report S82.434P with its seventh character instead.

A submission platform with built-in ICD-10 and CPT catalogs catches many of these errors before the claim reaches the payer. That removes a costly rework cycle from the billing team’s week.

How Pabau keeps the seventh character tied to the record behind it

Most fibula coding errors start in the note. The provider writes “fracture follow-up”, and the alignment appears only in an attached imaging report. The coder then picks D, since the note offers no alternative.

Pabau, practice management software for medical and multi-specialty practices, keeps the imaging result, the clinical note, and the diagnosis code on one patient record. Coders can see what the last X-ray showed before they choose a seventh character. Structured note templates prompt the provider to state union status and alignment while the patient is still in the room.

Claims then go out through the built-in claims management module and the Claim.MD clearinghouse integration. Code pairs get validated before submission, and remittance data returns to the same record. Your team can then see which fracture claims were rejected and fix the documentation behind them.

Reduce orthopedic claim denials with smarter billing workflows

Pabau connects ICD-10 coding with clinical notes, claims management, and Claim.MD submission, so your team catches seventh-character errors before they reach the payer.

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Conclusion

The seventh character is the only part of S82.434 a coder has to reason about, and it is where claims are lost. Treat P as sequela and the claim comes back. S82.434S is the sequela code, and the two characters describe different points in the same injury.

Get the documentation right and the code follows. The record needs malunion stated, the fracture confirmed as closed, the right side named, and the visit identified as a follow-up. Pabau ties that documentation to the claim itself, so coding errors surface before submission. Book a demo to see how fracture coding and claims run together in one system.

Continue your research

Need to verify ICD-10 code pairs before submission? Clean claim requirements in medical billing covers what every claim needs to pass payer edits the first time.

Seeing denial patterns across your orthopedic claims? Insurance eligibility verification workflows explains how to catch coverage issues before they become denials.

Rejections piling up after submission? Denial management in healthcare shows how to work each rejection back into the documentation that caused it.

Frequently asked questions about ICD-10 Code S82.434P