ICD code S72.435S – Nondisplaced medial condyle left femur fracture sequela

Key takeaways

S72.435S is a valid, billable ICD-10-CM code for sequela of a nondisplaced left medial condyle femur fracture, not an active one.

The 7th character S applies only after the fracture has healed. Use A, D, G, K or P while a closed fracture is still present.

A code for the nature of the sequela, such as M25.562 for left knee pain, is sequenced first and S72.435S follows it.

Claims software such as Pabau, with its Claim.MD clearinghouse integration, helps orthopedic and musculoskeletal practices catch 7th character errors before submission.

ICD-10 code S72.435S: Definition, billable status, and code hierarchy

ICD-10 code S72.435S describes a nondisplaced fracture of the medial condyle of the left femur, coded at the sequela stage. A sequela is a late effect that persists after the fracture itself has healed. The code is valid and billable in the current (FY2027) ICD-10-CM, and it sits in the injury chapter at this point in the hierarchy:

S72.435 is a non-billable stem. Every claim must carry the full 7-character code. S72.435S is the sequela variant. It is the only appropriate code once the fracture has resolved but still causes symptoms, such as chronic knee pain, stiffness, or deformity. Codes for other femur fracture sites sit in our ICD-10-CM code library, grouped by category.

Clinical anatomy: Nondisplaced fracture of the medial condyle of the left femur

The medial condyle is the rounded projection at the distal end of the femur that forms the inner half of the knee joint. A nondisplaced fracture means the bone fragments retain their normal anatomical alignment, unlike a displaced fracture where fragments have shifted. This distinction has direct coding consequences: Displaced fractures of the left medial condyle map to S72.432, not S72.435.

Nondisplaced medial condyle fractures typically result from direct axial loading, valgus stress, or a fall onto a partially flexed knee. Because the cortical alignment is maintained, these fractures are often managed conservatively with immobilization and partial weight-bearing. Comminution or articular surface involvement can still prompt open reduction and internal fixation (ORIF). The 7th character follows the episode of care at each visit, whatever the treatment was.

Understanding the 7th character for S72.435

The 7th character extension is the most consequential coding decision for the S72.435 code family. Per the CMS ICD-10-CM coding guidelines, each character maps to a specific episode of care. Assigning the wrong one is a frequent cause of denials for this code family.

S72.435 takes sixteen 7th characters in all. The ten open-fracture characters are B, C, E, F, H, J, M, N, Q and R, which leaves six for closed fractures and sequela. The table covers the closed-fracture characters plus sequela, since a nondisplaced condyle fracture is usually closed.

Key distinction: S72.435K (closed fracture with nonunion) means the fracture still exists and has failed to heal. S72.435S (sequela) means the fracture is gone and only the aftermath remains. Assigning K to healed bone is a coding error. So is assigning S while the fracture still shows on imaging, and each one weakens the medical necessity record differently.

When to use S72.435S: Sequela vs subsequent encounter vs initial encounter

Sequela coding applies once the nondisplaced medial condyle fracture has fully healed. The patient then presents with a late effect caused by that prior injury. ICD-10-CM Official Guidelines Section I.C.19.a assigns the 7th character S to these late effects, and Section I.B.10 covers sequela coding generally. The fracture no longer exists as a current condition, so the code describes its consequence.

Use this decision sequence to select the correct 7th character:

1. Is the fracture still present on current imaging? If yes, the fracture is active or healing. Use A, D, G, K, or P for a closed fracture, depending on healing status. Do not use S.
2. Has the treating provider documented that the fracture has healed? If the record states “fracture healed,” “callus formation complete,” or “no fracture line visible,” the fracture has resolved.
3. Is the patient presenting for a condition caused by the prior fracture? Common late effects include post-traumatic arthritis, chronic pain at the medial knee compartment, stiffness limiting range of motion, or deformity secondary to the original injury. If yes, S72.435S is appropriate.
4. Does the documentation link the current condition to the original fracture? The medical record must establish causality. A note that reads “knee pain, history of left medial condyle fracture” does not automatically justify S72.435S. The provider must state the current condition is a sequela of the prior fracture.

The chart condenses those four questions into one path, from the imaging check to the final 7th character.

Sequela codes under ICD-10-CM are not time-limited. There is no defined minimum elapsed time between the fracture and the sequela visit. What matters is clinical documentation confirming the fracture has healed and the presenting condition is its late effect.

S72.435S vs adjacent codes: Laterality, displacement, and 7th character variants

The S72.43 family contains several easily confused codes. Getting laterality or displacement wrong leads to a specificity denial. The record documents the side, but the billed code does not reflect it. According to the CDC/NCHS ICD-10-CM web tool, laterality must always be coded to the highest level of specificity when the medical record documents it.

The most common confusion is between S72.435S and S72.435K. Both involve a patient with a past fracture who still has symptoms. Imaging is the differentiator. If current imaging confirms nonunion, with a visible fracture gap and no bridging callus, assign K to the claim. If imaging shows healed bone with late-effect symptoms, assign the sequela character.

Documentation requirements to support S72.435S

Payer medical necessity review for sequela codes is more document-intensive than for active fracture codes. The medical record must contain all of the following to support S72.435S and pass medical billing compliance standards for orthopedic sequela claims:

• Evidence the original fracture has healed: A dated radiology report or provider note confirming healing, callus formation, or absence of fracture line on current imaging.
• Date and description of the original injury: The record must establish when and how the fracture occurred. This anchors the causal chain between the original event and the current sequela.
• Current condition described as a sequela: The treating provider must explicitly link the current problem to the prior fracture. Medial knee pain and limited flexion are typical examples. A phrase like “sequela of left medial condyle fracture, now healed” in the assessment section satisfies this requirement.
• Nature of the sequela coded separately: ICD-10-CM guidelines call for a code describing the nature of the sequela alongside S72.435S. Examples include M25.562 (pain in left knee), M25.662 (stiffness of left knee, not elsewhere classified), or a post-traumatic arthritis code. S72.435S is sequenced after it.
• Medical necessity narrative for any associated procedure: The visit may involve a physical therapy evaluation, hardware removal, or a pain management injection. The documentation must explain why the sequela calls for that service.

Medicare and commercial payers may request medical records for retrospective review on sequela claims, particularly when the time elapsed since the original fracture is short. Maintaining a documented imaging timeline strengthens the record significantly.

CPT codes commonly paired with S72.435S

S72.435S represents a healed fracture with a late effect. The CPT codes for sequela visits therefore differ from those used in the acute or healing phases. Acute fracture treatment codes are for active fracture repair. Examples are CPT 27503 (closed treatment of supracondylar or transcondylar femoral fracture, with manipulation) and CPT 27506 (open treatment of femoral shaft fracture). Pairing them with S72.435S creates a clinical inconsistency that payers flag.

Hardware removal is the procedure most often tied to this sequela. When a retained plate or screw causes the knee pain, the removal bills as 20680 with S72.435S as the supporting diagnosis.

Common claim denial reasons for S72.435S

Denials on S72.435S claims cluster around three root causes: The wrong 7th character, insufficient documentation of the sequela-fracture link, and laterality mismatches. Understanding the specific Claim Adjustment Reason Code (CARC) attached to each denial type speeds up denial management in healthcare for orthopedic billers.

• Wrong 7th character (most common): Using S72.435D instead of S72.435S when the fracture has healed. Payers see the subsequent-encounter character D and expect active fracture documentation. When the record shows healing, the claim is denied for inconsistent documentation. CARC 11 (diagnosis inconsistent with procedure) and CARC 50 (not medically necessary) are commonly attached.
• Missing causality statement: The record notes current knee pain and, separately, a history of left medial condyle fracture. It never explicitly connects the two. Without that causal link, the sequela code has no documentary support.
• Secondary sequela code absent: Some payers require the sequela condition code, such as M25.662 (stiffness of left knee), to appear on the claim alongside S72.435S. When only S72.435S is billed, the claim may reject for missing specificity on the nature of the condition being treated.
• Laterality mismatch: Imaging documents a left-sided injury, but the billed code is S72.434S (right side). This produces a claim edit that requires correction before resubmission.
• Acute fracture CPT paired with a sequela ICD: Billing CPT 27503 or 27506 alongside S72.435S trips payer diagnosis-to-procedure edits. The procedure implies an active fracture, while the diagnosis states the fracture has healed. Check the payer’s coverage edits before pairing any acute surgical CPT with S72.435S.
• Unspecified code used when laterality is documented: S72.436S covers a nondisplaced medial condyle fracture of an unspecified femur. Coding it when the record names the left femur can trigger a specificity denial.

Pre-submission claim scrubbing checks these edit pairs before a claim reaches the clearinghouse, so most of these errors never reach a payer. The clean claim requirements for sequela codes are stricter than for active fracture codes, because payers scrutinize the healed-fracture assertion more heavily.

Coding tips and common mistakes with S72.435S

A few recurring errors cost orthopedic and physical therapy practices time on appeals every billing cycle. These apply across the ICD-10-CM code range for femur fractures, but they are especially common with sequela codes.

• Do not assign S72.435S for an active fracture. Sequela coding requires a healed fracture. If the patient is still in casting, immobilization, or post-surgical fracture care, the fracture has not healed. Use A, D, or G as appropriate.
• Never code S72.435S simultaneously with an active fracture code for the same bone. You cannot have both an active and a healed fracture of the left medial condyle at the same time. The combination generates an edit.
• Add the sequela condition code. S72.435S alone tells payers what caused the patient’s problem but not what the problem is. Add a code such as M25.662 (stiffness of left knee) or M25.562 (pain in left knee) to complete the picture. Sequence the condition code first, S72.435S second.
• Confirm code validity for the billing year. Verify S72.435S remains active in the current FY ICD-10-CM release before billing. Codes can be added, revised, or deleted with each October 1 update.
• Document the original injury date. Payers occasionally request the original trauma date to confirm the claim does not duplicate an active fracture episode already on file. Having it in the record settles the question.

How practice management software supports accurate fracture sequela coding

Each femur sequela claim needs three items confirmed: The original fracture date, the healed-fracture confirmation, and the nature of the sequela. When those live in separate notes or systems, coders miss them. Gathered in one structured record, they make the 7th character choice straightforward.

Pabau, the all-in-one practice management system we build, stores clinical notes, imaging reports, and provider attestations against the patient record. Billing staff see them without switching systems. Our claims management software then routes each claim through the Claim.MD clearinghouse integration, which checks CPT-ICD pairs against payer edits. An acute fracture code paired with S72.435S gets flagged before the payer sees it.

Physical therapy and sports medicine practices gain most when the PT evaluation and the referring orthopedic visit share one record. The PT evaluation (97161-97163) and the referring E&M visit then carry the same sequela diagnosis and the same side. Left-right errors and date mismatches tend to start where two disconnected systems meet.

Keeping the episode of care visible in scheduling and in the clinical record also stops returning patients from defaulting to the wrong 7th character. That habit is part of a wider revenue cycle management workflow built to keep sequela denials low.

Catch sequela coding errors before submission

Pabau keeps imaging reports, sequela statements, and claims in one patient record. Its Claim.MD integration checks CPT-ICD pairs against payer edits before a claim goes out.

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Conclusion

Code S72.435S only when the record proves two facts: The left medial condyle has healed, and the provider ties the current problem to that fracture. If imaging still shows a fracture line, the claim belongs to A, D, G, K, or P instead.

The trade-off is a minute of documentation at the visit against weeks of appeals later. A standard sequela statement in the assessment and a nature-of-sequela code on every claim remove two frequent denial triggers.

Book a demo to see how Pabau keeps the imaging report, the sequela statement, and the claim in one patient record.

Continue your research

Need help navigating ICD-10 denial codes? Denial codes in medical billing covers CARC and RARC codes that appear on remittances when a sequela claim is rejected.

Want to strengthen your claim submission workflow? Medical superbill documentation explains how to build a superbill that captures sequela diagnosis and nature-of-sequela codes together.

Looking for clearinghouse options for US fracture claims? Medical claims clearinghouse overview explains how clearinghouses validate ICD-CPT pairs before submission.

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