ICD code S72.424B – Nondisplaced lateral condyle femur fracture

Key takeaways

S72.424B covers a nondisplaced fracture of the right femur’s lateral condyle. The left side is S72.425B, and ICD-10-CM has no bilateral femur code, so code each side.

The 7th character B means initial encounter for an open fracture, Gustilo-Anderson type I or II. Use A for closed fractures and C for type IIIA, IIIB or IIIC, while D, E and F are subsequent encounters.

The operative or emergency department note must state the Gustilo-Anderson grade, because coders cannot assign the grade themselves.

A fracture the record does not call nondisplaced defaults to displaced, which moves the claim to S72.421B.

Pabau’s claims management software submits S72.424B claims through its Claim.MD integration, which checks the diagnosis-procedure pairing and eligibility first.

ICD-10 code S72.424B: Quick reference

What S72.424B covers: Full code descriptor explained

Each segment of the S72.424B descriptor carries a specific clinical meaning. Misreading any one of them produces a miscoded claim.

• S72: Fracture of femur. The S72 category covers traumatic femur fractures from the femoral head and neck (S72.0-) through the distal condyles (S72.4-).
• .4: Fracture of lower end of femur. The fourth character places the fracture at the distal femur rather than the shaft or proximal end.
• .42: Fracture of lateral condyle of femur. The fifth character narrows the site to the lateral condyle. That is the bony prominence at the outer edge of the distal femur, part of the knee joint. A medial condyle fracture at the same level uses .43 (S72.43-). S72.41- is the unspecified condyle code.
• 4 (6th character): Nondisplaced fracture, right femur. In S72.42-, 1, 2 and 3 are displaced right, left and unspecified. 4, 5 and 6 are nondisplaced right, left and unspecified. Left nondisplaced is S72.425B.
• B (7th character): Initial encounter, open fracture type I or II. This character carries both the encounter type (active treatment) and the open fracture grade (Gustilo-Anderson type I or II).

Displaced vs. nondisplaced: Nondisplaced means the fracture fragments have not moved from their normal anatomical alignment. The fracture shows on imaging, but the cortical surfaces stay apposed. The ICD-10-CM guidelines code a fracture to displaced when the record does not say which it is. Without the word “nondisplaced” in the note, the claim belongs on S72.421B.

The six codes in the S72.42- subcategory differ only in their 6th character, and the 7th character then sets the wound grade.

Understanding the 7th character B: Initial encounter for open fracture

The 7th character B designates the initial encounter for an open fracture classified as Gustilo-Anderson type I or II. Under the ICD-10-CM Official Guidelines for Coding and Reporting (Section I.C.19.a), initial encounter means the patient is receiving active treatment. It does not depend on whether this provider has seen the patient before.

Gustilo-Anderson classification and open fracture type selection

The Gustilo-Anderson classification grades open fractures by wound size, contamination level, and soft-tissue damage. The treating physician, not the coder, assigns the grade. Coders abstract the grade from the operative note or emergency department documentation.

S72.424B vs. similar codes: How to choose the right code

The codes below differ from S72.424B by a single character, and each describes a different injury. Payers check every one of those characters against the record.

Excludes notes and coding conventions for S72.424B

ICD-10 code S72.424B inherits tabular notes from two levels, the S72 category and the S72.4 subcategory. They decide which codes may sit alongside it on the claim.

• Category scope: S72 covers fractures of the whole femur, from the head and neck (S72.0-) and the trochanteric region (S72.1-) to the lower end (S72.4-). Lateral condyle fractures sit under S72.4-, fracture of lower end of femur.
• Excludes1 (S72 level): Traumatic amputation of hip and thigh (S78.-). An Excludes1 note means the two conditions are never coded together.
• Excludes2 (S72 level): Fracture of lower leg and ankle (S82.-), fracture of foot (S92.-), and periprosthetic fracture of a prosthetic hip implant (M97.0-). These are not part of S72, so both codes may be reported when both injuries are present.
• Excludes (S72.4 level): Fracture of the femoral shaft (S72.3-) and physeal fracture of the lower end of the femur (S79.1-). A growth-plate fracture in a child goes to S79.1-, not S72.424B.
• Open wound (general guidance): The 7th character B captures the wound. A separate wound code is not usually added unless the wound is distinct from the fracture site.

Clinical presentation and documentation requirements

A valid assignment of ICD-10 code S72.424B requires the medical record to explicitly support each element of the descriptor. Coders who rely on inference rather than explicit documentation expose claims to audit risk.

The medical record must contain:

• Mechanism of injury: High-energy trauma (motor vehicle collision, fall from height, sporting impact) consistent with a distal femur fracture. A low-energy mechanism in an older patient may point to a pathological fracture, which is coded in M80-M84 instead of S72.
• Imaging findings: X-ray or CT confirming fracture at the lateral condyle, with a note stating nondisplaced or “fragments in anatomical alignment.” The radiologist’s report or the treating physician’s interpretation must use this language.
• Laterality confirmation: The note must identify the right limb. A note that says “femoral condyle fracture” without specifying a side requires clarification before coding S72.424B.
• Open wound documentation: The emergency department or operative note must show that the wound communicates with the fracture. Visible bone, a wound that probes to bone, or an explicit statement that the fracture is open all qualify.
• Gustilo-Anderson grade: The surgeon or emergency physician must state the grade. It can sit in the operative note, the ED note or a documented query response. “Open fracture, Gustilo type II” or “type I open injury” satisfies this requirement.

Every entry should also be dated and signed by the responsible provider. Cross-check the operative and radiology reports so both describe the same side, site and displacement.

Procedures commonly reported with S72.424B

Open fractures of the lateral femoral condyle almost always need surgery. The CPT codes below are commonly reported with S72.424B. Check each pairing against the current National Correct Coding Initiative (NCCI) edits before submission. A sound medical billing workflow confirms these pairings on every claim, not once per template.

When the surgeon stages treatment, the temporary frame is reported with 20690 and the definitive ORIF with 27514 at a later surgery. Both dates of service carry S72.424B, because the patient is still in active treatment.

Payer requirements: Medicare and commercial insurer rules

Medicare coverage for distal femur fracture repair follows national coverage policy. Where they apply, Local Coverage Determinations (LCDs) from the regional Medicare Administrative Contractor (MAC) add to it. LCDs vary by contractor and are revised over time. Check the current version for your region before submitting a claim.

A clean claim for S72.424B depends on four checks before it leaves your system. Claims software for billing teams should run them on every claim:

• Admission diagnosis vs. principal diagnosis: S72.424B is typically the inpatient principal diagnosis. That holds when, after study, the open condyle fracture is chiefly responsible for the admission.
• DRG assignment: Without an OR procedure, a femur fracture admission groups to MS-DRG 533-534 (fractures of femur). Once ORIF is performed, the stay groups to the hip and femur procedure DRGs 480-482. Check the output of the current grouper before transmission.
• Prior authorization: ORIF of an open fracture is urgent, so it rarely needs advance authorization. Many commercial payers still expect notification within 24 to 48 hours of admission. Check your payer contract for exact timelines.
• Medical necessity documentation: Imaging must confirm the fracture. The record also needs a physician attestation that surgery was medically necessary, plus an operative note detailing the fixation approach.

Each check sits inside the wider revenue cycle management process, which runs from the coded encounter to the final payment.

Common denial reasons and how to avoid them

ICD-10 code S72.424B claims deny for predictable reasons. Each one takes minutes to fix in the operative note and hours to fix in an appeal.

• Wrong 7th character (most common): Assigning A (closed) to an open fracture, or C (Gustilo III) when the note documents type I or II. Both errors trigger medical necessity or coding validity denials. Fix: Confirm the Gustilo grade in the operative note before selecting the 7th character.
• Displaced vs. nondisplaced miscoding: S72.421B (displaced) and S72.424B (nondisplaced) are frequently swapped when the imaging report uses vague language. Fix: The radiologist or treating physician’s note must explicitly state “nondisplaced” or “in anatomical alignment.” Query the provider if the record is ambiguous.
• Missing Gustilo grade in operative note: Auditors look for an explicit Gustilo grade on open fracture claims. A note that says only “open fracture” without the grade will not support B vs. C selection. Fix: Implement a documentation template in your orthopedic practice that includes a Gustilo grade field in every open fracture operative report.
• Laterality mismatch: Submitting S72.424B (right) when the operative site is the left femur (use S72.425B). Fix: Cross-reference the operative note laterality statement against the code’s laterality character before submission.
• Debridement reported with ORIF: Payers often bundle debridement into the fracture repair. Fix: Check the NCCI column 1/column 2 edits for the specific CPT pair. Append modifier 59 only when the debridement is separate and distinct from the repair.

Structured denial management workflows tag each reason code back to the original claim. Billing teams can then see which pattern keeps recurring and fix it at the source. Common payer denial codes on fracture claims include CO-4 (modifier inconsistent with the procedure) and CO-11 (diagnosis inconsistent with procedure). CO-22 (care may be covered by another payer) also turns up.

How Pabau keeps S72.424B claims accurate

A fracture claim usually passes through three people. The surgeon dictates the operative note, and a coder reads it for side, displacement and Gustilo grade. A biller then keys the claim into a clearinghouse portal. Each handoff is a chance for B to become A, or right to become left.

Pabau, the practice management and billing platform we build, submits S72.424B claims electronically through its Claim.MD integration. The integration validates diagnosis-procedure pairings and checks eligibility before the claim goes out.

Electronic remittance advice comes back into Pabau as well, so denial reasons show beside the claim instead of in paper EOBs. Your billing team can trace a CO-11 to the note that caused it and correct the template, not just the claim.

Streamline your orthopedic claims workflow

Pabau’s integrated claims management connects diagnosis coding, electronic submission, eligibility checks and ERA retrieval in one platform. S72.424B claims reach the payer with the right documentation attached.

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Conclusion

S72.424B is only correct when the record states four facts in so many words. The fracture is on the right, it is nondisplaced, it is open, and the surgeon graded it type I or II. If any one of them is missing, query the provider before you code, because the defaults point elsewhere.

The trade-off is a short delay at coding against weeks lost to a denial and appeal. A Gustilo field in the operative template and a laterality check at charge entry remove most of that delay.

Book a demo to see how Pabau checks fracture claims for pairing and eligibility before they reach the payer.

Continue your research

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