ICD-10 code S72.442C: Displaced lower femur fracture, left

Key takeaways

ICD-10 code S72.442C covers a displaced fracture of the lower epiphysis of the left femur. It applies at the initial encounter for a Gustilo type IIIA, IIIB, or IIIC open fracture.

The code is fully billable under the 2026 ICD-10-CM edition, effective October 1, 2025. Parent code S72.442 is not billable without a 7th character.

The 7th character C applies only at the initial encounter. Subsequent visits take characters D through R, depending on healing status.

Six documented elements have to be in the record before a coder can assign S72.442C, and the Gustilo sub-grade is the one most often missing.

Practice management software like Pabau ties clinical notes to claim submission, so billing teams catch a missing Gustilo grade before the claim goes out.

ICD-10 code S72.442C is a billable diagnosis code for a displaced fracture of the lower epiphysis of the left femur. It covers the initial encounter for an open fracture graded Gustilo type IIIA, IIIB, or IIIC.

The code is specific on six points, and all six have to appear in the record before a coder can assign it. This reference walks through the full descriptor, every 7th character variant, the Gustilo criteria, and the documentation a payer expects to see behind the claim.

ICD-10 code S72.442C: Quick reference

S72.442C became effective October 1, 2025 as part of the 2026 ICD-10-CM edition. The table below gives coders and billing staff the at-a-glance facts before the clinical detail starts.

Billable status and reimbursement are separate questions. Payer policy decides what actually gets paid, so verify coverage before you submit. To confirm the code is still valid in the active edition year, check the CDC/NCHS ICD-10-CM tool.

What S72.442C means: Full code description

Every character in S72.442C carries clinical meaning. Read the structure once and the rest of the S72.44 family becomes straightforward to assign.

Displaced vs. nondisplaced: a displaced fracture means the bone fragments have shifted out of alignment. In pediatric and adolescent patients, that displacement often involves separation of the growth plate.

Physeal separation carries its own healing implications. Nondisplaced lower epiphysis fractures use S72.445 for the left femur, S72.444 for the right, and S72.446 when laterality is unspecified.

Accurate clinical documentation at the point of care decides whether the claim clears first time. Laterality, displacement status, and open-fracture grade must all appear explicitly in the operative or emergency report before a coder can assign S72.442C.

Understanding the 7th character C: Open fracture types IIIA, IIIB, and IIIC

The 7th character C carries two pieces of information at once. It marks the initial encounter, and it marks an open fracture graded Gustilo type IIIA, IIIB, or IIIC. A wrong grade makes the whole code wrong.

The Gustilo-Anderson classification grades open fractures by the degree of soft tissue injury and contamination. It was published in the Journal of Bone and Joint Surgery in 1976 by Gustilo RB and Anderson JT.

Gustilo RB and colleagues refined it in 1984. Type III is the most severe category, and its three sub-types map directly to 7th character C.

Assigning a Gustilo grade takes clinical judgment. The IIIA and IIIB distinction rests on an intraoperative assessment of soft tissue viability, rather than on wound measurement alone.

A coder cannot assign 7th character C unless the surgeon documents the sub-type in the operative report. When the note says only “open fracture, type III”, query the surgeon before coding.

All 7th character variants for S72.442

The parent code S72.442 requires a 7th character to be billable. The valid extensions cover three scenarios: initial encounter, subsequent encounter during healing, and complications such as nonunion or malunion. Check the patient’s encounter type and healing status against this table before you select one.

Take a patient first coded S72.442C for a Gustilo IIIB fracture. When they come back for a cast check with routine healing, the code shifts to S72.442F.

Reusing the initial encounter code on follow-up visits is one of the most audited errors in orthopedic billing. Patient care workflows that flag encounter type at scheduling catch it before the claim goes out.

S72.442C vs related open fracture codes: When to use which

Three codes describe the same injury at the same encounter, and they differ only on open-fracture status and Gustilo grade. Picking the wrong one changes both the clinical picture on the record and the reimbursement level.

The S72.442B vs S72.442C decision point: the emergency note may say only “open fracture” while the operative report later specifies Gustilo IIIB. The operative report wins, so the claim carries S72.442C. Always code to the highest specificity the documentation supports.

For right-sided injuries, the equivalent codes are S72.441A, S72.441B, and S72.441C. Unspecified laterality takes S72.443 with the matching 7th character. Avoid it whenever the record clearly states left or right, because payers read unspecified codes as a documentation problem.

Clinical anatomy: Lower epiphysis fractures of the femur

The lower epiphysis of the femur sits at the distal end of the femoral shaft, just above the knee. In growing patients, this physeal cartilage is weaker than the bone around it. High-energy trauma in children and adolescents therefore tends to produce physeal separation rather than a shaft fracture.

Clinicians usually classify these injuries with the Salter-Harris system. Types I through V describe the fracture pattern relative to the physis, epiphysis, and metaphysis.

S72 code descriptors do not mention Salter-Harris anywhere. They turn on displacement and laterality instead. So the surgeon’s Salter-Harris grade guides treatment, while the coder still needs the words “displaced” and “left” in the note.

In adults, these fractures usually follow high-velocity trauma such as motor vehicle collisions or falls from height. Those are the same mechanisms that produce Gustilo type III open injuries.

S72.442C therefore signals a complex wound. Expect operative debridement, possible vascular repair, and months of rehabilitation. Physical therapy software built for orthopedic recovery tracks the same patient through every subsequent encounter code.

Documentation requirements for S72.442C

A claim carrying S72.442C needs documentation that establishes all six qualifying elements. Missing any one of them creates audit exposure, even when the clinical picture clearly fits the code.

• Fracture displacement: the operative or radiology report must confirm the fragments are displaced. “Epiphyseal separation with displacement” or equivalent wording supports this.
• Anatomical location: documentation must name the lower epiphysis, or the distal femoral physis, as the fracture site. The femoral neck, shaft, and intertrochanteric region all code elsewhere.
• Laterality: the note must explicitly state left femur. “Left distal femur” and “left knee area fracture” both support left laterality coding.
• Open fracture confirmation: the emergency or operative note must document an open wound communicating with the fracture, not just a laceration near the injury site.
• Gustilo classification grade: the surgeon must specify IIIA, IIIB, or IIIC in the operative report. “High-energy open fracture” alone will not support 7th character C, so query the provider.
• Encounter type: the patient must be receiving active, initial treatment for this fracture. A follow-up, wound check, or rehabilitation visit does not qualify. The initial encounter ends when active treatment concludes, not when the fracture heals.

The CMS ICD-10-CM guidelines require coding to the highest level of specificity the documentation supports. All six elements have to be documented rather than inferred. When the record falls short, the AHA Coding Clinic recommends querying the provider instead of dropping to a less specific code.

High-volume orthopedic trauma practices lean on structured documentation review. A template that prompts the surgeon for a Gustilo grade at the time of operative reporting removes the most common query on these claims.

That front-end discipline is what produces a clean claim on the first pass. It also keeps the practice inside billing compliance rules on specificity and provider queries.

Fracture volume is lower in sports medicine practices, and that is exactly where the prompt earns its place. The habit never forms on volume alone.

ICD-10-CM coding guidelines for S72 fractures of the femur

The S72 category follows the ICD-10-CM Official Guidelines for Coding and Reporting. CMS and the National Center for Health Statistics (NCHS) maintain them jointly, and they govern every femur fracture code.

Encounter type selection rules

The initial encounter characters A, B, and C apply throughout active treatment. That covers the emergency visit, the surgery, and any encounter where the fracture is still being managed actively.

Once treatment moves into the aftercare and healing phase, characters D through R take over. The phase of treatment decides the character, not the number of visits.

External cause codes

For traumatic fractures like those in the S72 category, official guidelines recommend an external cause code to identify the mechanism of injury. For a Gustilo type IIIA-C open femur fracture, that mechanism is usually high-velocity trauma.

Common companions include V49.xx for a motor vehicle occupant and W17.xx for a fall from height. These codes support medical necessity, and workers’ compensation and liability payers often require them.

Sequencing rules

When the fracture is the reason for the visit, it sequences as the principal diagnosis. If the patient is admitted mainly for a complication, such as infection of the open wound, the complication code may sequence first. S72.442C then follows as an additional code.

High-energy trauma rarely produces one injury on its own. Associated damage takes its own code alongside the fracture. Examples include S86.921A for lower leg muscle and tendon injury, and S94.20XA for nerve injury at ankle level.

Follow the Tabular List sequencing instructions for the encounter in front of you. The AAPC code range reference gives searchable access to the full tabular list with its coding notes and crosswalks.

When an S72.442C claim does come back rejected, the remittance carries a reason. Reading denial codes against the documentation usually points straight at the missing Gustilo grade. A standing denial management process turns that pattern into a fix rather than a rework queue.

How Pabau keeps S72.442C claims documented and submitted

In most orthopedic practices the operative note lives in one system and the claim is built in another. A coder reads the note, then types the code into a billing screen. The missing Gustilo grade only surfaces when the remittance arrives weeks later.

Practice management software like Pabau keeps both halves in one record. Clinical notes, laterality, imaging, and the encounter date sit against the same patient the claim is built from. Our claims management tools then submit electronically through the Claim.MD integration, the clearinghouse we file through.

Encounter type is set at scheduling, the coder sees the operative note beside the claim, and rejections land back in the same record. The submission passes through a medical claims clearinghouse before it reaches the payer. A clean file at source saves a rework cycle later.

Reconstruction and rehabilitation after a type III fracture usually need approval first. Prior authorization software keeps those requests attached to the same case file, so nothing is rebuilt from scratch at the next encounter.

Submit orthopedic fracture claims with the documentation attached

Pabau keeps operative notes, laterality, and encounter type in the same record your claim is built from, then files electronically through Claim.MD. Billing teams catch a missing Gustilo grade before the claim leaves the practice.

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Conclusion

Assigning S72.442C is straightforward. Defending it is the work, because five of its six elements live in a note the coder did not write.

So the fix sits upstream of billing. Build the Gustilo prompt into the operative template, set encounter type at scheduling, and the 7th character stops being a judgment call. The claims that follow need no query and no rework.

Book a demo to see how Pabau ties clinical documentation to claim submission for orthopedic and trauma practices.

Continue your research

Coding the immobilization as well as the fracture? HCPCS code L0636 covers the documentation and billing rules for supplied orthotic devices.

Treating physeal injuries in children? Pediatric assessment sets out the examination structure behind a defensible pediatric trauma note.

Billing a tendon repair alongside the diagnosis? CPT code 24340 explains the operative detail payers expect on a tendon repair claim.

Tracking recovery after a type III fracture? Pain journal template gives patients a structured way to record symptoms between appointments.

Need a cleaner record of each encounter? Patient visit summary template captures the encounter detail that later supports your 7th character choice.

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