ICD code S72.402D – Left femur lower end fracture follow-up

Key takeaways

S72.402D covers the left femur only: The right side uses S72.401D, and the unspecified side uses S72.409D.

The 7th character D requires that active treatment is complete and the fracture is healing routinely, without delay, malunion, or nonunion.

Missing laterality documentation or using character A instead of D for a follow-up visit are the two most common denial triggers for this code.

Pabau’s claim validation checks each claim for missing or invalid details before submission, so fixes happen before the payer sees it.

ICD-10 code S72.402D: Quick reference

ICD-10 code S72.402D reports a follow-up visit for a closed fracture of the lower end of the left femur that is healing on schedule. The record doesn’t name the fracture pattern, which is why the code is “unspecified.” The table below confirms its core details.

What does S72.402D mean? Breaking down the code structure

S72.402D is a seven-character code, and each segment carries a distinct clinical meaning. Reading the characters left to right gives coders the anatomy, the fracture specificity, the laterality, and the encounter type in a single string.

The digit “2” in position six signals the left femur. The parallel right-side code is S72.401D, and S72.409D covers cases where laterality is not documented. Coders shouldn’t default to S72.409D just because the current note is vague. If the operative or imaging report states “left,” the code must reflect it.

Clinical context: Unspecified fracture of the lower end of the left femur

The lower end of the femur, also called the distal femur, encompasses the supracondylar region and the femoral condyles just proximal to the knee joint. Fractures here are anatomically complex because the bone flares outward and sits close to major neurovascular structures, the popliteal artery in particular.

“Unspecified” in the code descriptor means the documentation does not differentiate between fracture subtypes such as supracondylar, unicondylar medial, unicondylar lateral, or comminuted patterns. Physical therapists treating post-fracture rehabilitation see this code often, because the imaging details from the acute episode are not always restated in follow-up notes.

Common causes and patient populations for lower-end femur fractures include:

• High-energy trauma in younger patients (motor vehicle collisions, falls from height)
• Low-energy falls in older adults with underlying osteoporosis, where a ground-level fall generates sufficient force at the distal femur
• Periprosthetic fractures around a total knee replacement, which code to M97.1- (periprosthetic fracture around internal prosthetic knee joint) instead of S72.4-
• Pathological fractures secondary to metastatic bone disease, which use M84.5- (pathological fracture in neoplastic disease) instead of S72.-

Because S72.402D applies only to closed fractures with routine healing, any open fracture follow-up or complicated healing pattern must use a different 7th character. The clinical record has to support whichever character the coder picks.

Understanding the 7th character D: Subsequent encounter versus other options

The 7th character for S72.402 determines encounter type and healing status. Character D specifically means the patient is in the subsequent-encounter phase for a closed fracture that is healing without complication. S72.402 takes 16 valid 7th characters. The most common are listed below.

Characters H, J, M, N, Q, and R cover open-fracture subsequent encounters with delayed healing, nonunion, and malunion respectively. Character S (sequela) applies only after the fracture itself has fully resolved. The visit then addresses a residual condition caused by it, such as chronic knee stiffness.

When to use S72.402D: Correct versus incorrect encounter types

S72.402D applies when active treatment of the fracture is complete and the patient attends a follow-up visit during which the fracture is healing on schedule. The ICD-10-CM Official Guidelines for Coding and Reporting set this out in Section I.C.19. The subsequent encounter phase begins once the visit’s main purpose is monitoring a healing fracture rather than delivering active treatment.

A different provider treating the same fracture at a follow-up visit still uses the D character. The 7th character tracks the phase of care for the injury, whichever provider sees the patient. The three questions below take the full choice in order, from laterality to healing status.

S72.402D versus related codes: Avoiding common coding errors

Several codes share almost identical descriptors with S72.402D but differ in a single variable, such as laterality, fracture specificity, or healing status. Selecting the wrong one creates a claim that may pass automated edits but fail a post-payment audit.

Excludes notes and coding instructions for S72.402D

The S72 category carries coding notes that apply to every code in the family, including S72.402D. Coders must review these before submitting any claim in this category.

Excludes1 note (cannot code together)

• Traumatic amputation of hip and thigh (S78.-): Assign an S78 code instead of S72.402D when amputation occurred at the fracture site.

Excludes2 notes (may be coded together when both conditions exist)

• Fracture of shaft of femur (S72.3-): A shaft fracture is a separate condition from a lower-end fracture. When the record documents both, report both codes.
• Physeal fracture of lower end of femur (S79.1-): Growth-plate fractures in pediatric patients code to S79.1-. Add S72.402D only when a separate lower-end fracture is also documented.

Use-additional-code instructions

• External cause codes (W, X, Y range): The ICD-10-CM Official Guidelines instruct coders to identify the cause of injury with an additional code. A ground-level fall uses W18.xx or W19.xx, and a fall on stairs uses W10.xx. On a follow-up claim, the external cause code takes the same 7th character D as the injury code.
• Place of occurrence (Y92): Code the setting where the injury happened on the initial-encounter claim. Y92 is reported only at the initial encounter, so it doesn’t appear on an S72.402D claim.
• Activity (Y93): Add a Y93 code for what the patient was doing when injured, if your payer or registry wants it. Like Y92, it is reported once, at the initial encounter.

Associated CPT codes for distal femur fracture treatment

Pairing S72.402D with the correct CPT code is essential: Payers cross-reference the diagnosis code against the procedure code to confirm medical necessity. The table below maps the most common procedures to the care phase where S72.402D typically appears.

Understanding the full medical billing process for orthopedic follow-up helps practices choose the right CPT-diagnosis pairing from the outset, rather than correcting denials after submission.

CPT 27511 (open treatment, supracondylar/transcondylar fracture without intercondylar extension) and CPT 27513 (with intercondylar extension) are surgical codes billed at the initial encounter. Pairing either with S72.402D requires confirmation that a new procedure happened at a subsequent visit, which is uncommon. Check NCCI edits before billing a surgical CPT code with a subsequent-encounter ICD-10 code.

Medicare and payer requirements for S72.402D claims

CMS and most commercial payers expect the clinical record to demonstrate that the visit is medically necessary as a monitoring encounter. For subsequent-encounter fracture claims, “medically necessary” means the provider is actively assessing healing progress, managing a complication, or directing a defined course of rehabilitation.

• Documentation frequency: Medicare does not define a specific number of visits for closed-fracture follow-up. The Local Coverage Determination (LCD) for the relevant Medicare Administrative Contractor (MAC) jurisdiction governs. Coders should verify the applicable LCD before assuming unlimited follow-up is covered.
• Progress notes: Each claim must be supported by a progress note confirming the fracture status, the patient’s functional progress, and the provider’s assessment. A copy of the imaging report alone is insufficient.
• Healing confirmation: If imaging at the follow-up visit shows the fracture is healing normally, the note should state this explicitly. Vague language such as “patient doing well” increases audit risk without confirming the healing criterion the 7th character D requires.

Common S72.402D denial reasons and how to prevent them

S72.402D denials are predictable. The same small set of errors drives the majority of rejections, and each one has a documentation-level fix that prevents it before submission. Practices with strong denial management workflows catch these at the coding review stage rather than the appeals stage.

Each trigger above comes back on the remittance as a payer reason code. Decoding the denial codes tells you which fix to apply. Catching the error at the pre-submission review keeps each S72.402D visit a clean claim from the start.

Documentation requirements to support S72.402D

Solid documentation for S72.402D does two jobs. It justifies the subsequent-encounter character D, and it separates routine healing (D) from delayed healing (G), nonunion (K) or malunion (P). Coders rely on the provider’s clinical language to make this call.

Strong medical billing compliance in orthopedic and PT settings comes down to documentation habits that support the code at every follow-up visit.

The clinical record for each S72.402D encounter must include:

• Explicit laterality: The note must state “left femur” or “left lower extremity” in the assessment or HPI. “Left” in a prior note does not carry forward automatically for coding purposes.
• Confirmation that active treatment is complete: The provider should note that the original treatment, such as casting or surgical fixation, is finished. The note should also say the current visit is for monitoring or rehabilitation.
• Healing status assessment: Language such as “fracture healing as expected,” “callus formation noted on X-ray,” or “alignment maintained” supports character D. “No change” or “patient tolerated well” does not.
• Imaging reference: If X-rays were taken, the radiology report should be referenced in the note with a statement about healing progress. If imaging was not taken, the provider should document clinical signs of healing.
• Fracture type documentation: Because this code is for an unspecified fracture, the note need not describe the fracture pattern. If the provider has since specified it, the coder should reassess the code. A supracondylar fracture moves to the S72.45- subcategory, for example, and another specified pattern may fit S72.492D better.

How Pabau keeps S72.402D follow-up claims clean

On a busy orthopedic or PT schedule, the follow-up claim often reuses the code from the first visit. The 7th character stays at A, or the side slips to unspecified, and the denial arrives weeks later.

Pabau, the practice management and billing platform we build, keeps the clinical note and the claim in the same system. Pabau’s claim validation checks each claim for missing or invalid details before submission, so fixes happen before the payer sees it. That check is built into Pabau’s error-checking claims management.

Validated claims then go out electronically through the Claim.MD clearinghouse, Pabau’s US clearinghouse partner, which routes to thousands of US payers. Your billing team spends its time on new claims instead of appeals.

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Pabau’s claim validation checks each claim for missing or invalid details before it reaches Claim.MD. See how it works for orthopedic and PT practices.

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Conclusion

ICD-10 code S72.402D has a narrow scope: Closed, left-side, lower-end femur fracture, follow-up visit, healing on schedule. Each part of that description is a coding criterion, and the visit note has to prove every one.

The two most common denial triggers, the 7th character and laterality, are both fixable before the claim leaves the practice. Update the character at the first follow-up visit and confirm the side in that visit’s own note. When imaging shows slow healing, move to G before submission instead of defending D on appeal.

Pabau’s claim validation checks each claim for missing or invalid details before submission, so fixes happen before the payer sees it. Book a demo to see how Pabau handles orthopedic and PT follow-up claims from the visit note to payment.

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