ICD code S49.011P – Salter-Harris Type I physeal fracture, right humerus, malunion

Key takeaways

S49.011P designates a follow-up visit for a Salter-Harris Type I growth plate fracture of the proximal right humerus that healed in malalignment (malunion). It does not cover nonunion or sequela.

The P suffix requires radiographic confirmation of malunion in the radiology report. Without it, payers deny the claim or downcode it from P to D.

Confusing P (malunion) with K (nonunion) or S (sequela) is a common denial trigger for this code. Each suffix maps to a distinct clinical and billing scenario.

Claims management software such as Pabau helps practices submit cleaner claims and cut rework on physeal fracture follow-ups.

ICD-10 Code S49.011P: Quick reference

ICD-10 Code S49.011P is the billable code for a follow-up visit for a Salter-Harris Type I physeal fracture of the upper right humerus with malunion. Use it once imaging shows the growth plate fracture has healed out of alignment and the malunion is still under active care.

What S49.011P means: Breaking down the code

Each alphanumeric segment of S49.011P carries a distinct clinical meaning. Misreading any one position sends the claim to the wrong code.

• S49 — Injuries to the shoulder and upper arm (other and unspecified). The S40-S49 block covers the entire shoulder and upper arm region.
• 0 (fourth character) — Physeal fracture of the upper end of the humerus. This distinguishes growth plate injuries from shaft or distal fractures.
• 1 (fifth character) — Salter-Harris Type I fracture. A transverse fracture through the physis only, without metaphyseal or epiphyseal fragment involvement.
• 1 (sixth character) — Right arm laterality. The sixth character “2” would indicate the left arm; “9” indicates unspecified.
• P (seventh character) — Subsequent encounter for fracture with malunion. The bone has healed, but in a position that deviates from anatomic alignment.

Per the CMS ICD-10-CM coding guidelines, every fracture code requires a seventh character. That character must reflect the current episode of care, not the initial injury encounter. Understanding medical billing workflows for fracture follow-up helps practices apply this rule consistently across the S49 family.

Salter-Harris Type I fracture of the upper humerus: Clinical context

A Salter-Harris Type I physeal fracture of the proximal humerus is a transverse fracture running entirely through the growth plate. It does not extend into the metaphysis or epiphysis. Because the fracture line stays within the physis, plain radiographs may show only subtle physeal widening rather than a visible fracture fragment. This is a known diagnostic pitfall.

This injury occurs almost exclusively in skeletally immature patients. The proximal humeral physis is among the last to close, typically in the mid-to-late teens, which extends the vulnerable window well into adolescence. Mechanisms include falls onto an outstretched arm, direct shoulder impact in contact sports, and birth-related trauma in neonates.

Growth plate integrity makes early reduction critical. Displaced fractures left in angular malalignment risk remodeling into a fixed deformity, precisely the scenario that produces a malunion requiring the P suffix at follow-up. The AAPC’s ICD-10-CM code lookup confirms S49.011P as distinct from both unspecified physeal fracture (S49.001-) and the higher Salter-Harris types (S49.021- through S49.041-).

Understanding the P suffix: Malunion vs. nonunion vs. sequela

The three outcome-based seventh characters — K, P, and S — are mutually exclusive. Each one names a separate diagnosis, with its own medical necessity case and its own treatment pathway.

Malunion (P): the fracture has consolidated, but imaging shows angular deformity, rotational malalignment, or shortening. The patient is still receiving active fracture-related care.

Sequela (S): the fracture episode is complete. Any residual condition being treated — growth arrest, shoulder stiffness, physeal bar formation — is coded as the sequela condition with S49.011S as an additional code. Do not use S49.011P when the fracture itself is no longer being actively managed.

Check each follow-up encounter in the order below, since a sequela or nonunion visit can still show a deformity on imaging. Stop at the first yes.

S49.011P vs. adjacent codes: How to choose correctly

Three dimensions change the code: Salter-Harris type, laterality, and outcome suffix. Getting any one wrong routes the claim incorrectly. Use the table below to confirm each dimension independently before building the code.

Cross-check the fifth-character Salter-Harris type and its adjacent codes against the current tabular list before submitting. When the treating clinician or radiologist documents only “physeal fracture” without specifying a Salter-Harris type, default to S49.001P (unspecified) rather than assuming Type I.

Documentation requirements to support S49.011P

Payers validate S49.011P against the claim record during medical necessity review. Each of the following documentation elements must be present before submission. Missing any one is a common denial trigger.

• Radiology report confirming malunion: the report must describe angular deformity, rotational malalignment, or shortening. A note stating “fracture healing” without specifying the alignment outcome does not justify P over D.
• Laterality confirmed as right arm: the operative, radiology, and visit notes must all agree. A laterality mismatch between the claim and any document is an automatic edit-flag.
• Salter-Harris type documented: the treating clinician or radiologist must specify Type I. Without this, the coder must downcode to S49.001P (unspecified physeal fracture).
• Subsequent encounter established: the visit note must confirm this is not the acute injury encounter. Prior fracture records or the initial A-suffix claim history support this.
• No active sequela treatment: if the visit is managing a late effect (growth arrest, physeal bar) rather than the malunion itself, S49.011S applies instead. Documenting the specific condition being treated removes ambiguity.

Complete, consistent documentation is the most reliable way to prevent these denials. With denial-reducing claims software, practices can build a documentation checklist into the fracture follow-up workflow. The checklist prompts providers to confirm laterality and alignment status before the encounter closes.

CPT codes commonly paired with S49.011P

The procedure codes billed alongside ICD-10 Code S49.011P depend on whether the visit is a management-only encounter or involves corrective intervention. Confirming each CPT-to-ICD pairing before submission reduces front-end edits at the clearinghouse.

Corrective osteotomy (CPT 24400) requires separate prior authorization from most commercial payers. The ICD-10 Code S49.011P on the authorization request must exactly match the claim code. Therapy claims billed under 97110 or 97161 should list S49.011P as the linked diagnosis. A generic shoulder pain code leaves the payer without the malunion that justifies the therapy.

Payer requirements and prior authorization

Medicare covers fracture follow-up care under the Global Surgery Package rules. Some S49.011P encounters fall within the postoperative global period of the original fracture surgery. Separate E&M visits billed as 99213 or 99214 may be denied. The exceptions are a visit unrelated to the surgery and a significant, separately identifiable service.

For corrective procedures, commercial payers including major health plan carriers typically require prior authorization when surgical correction of a malunion is planned. The authorization package should include the malunion-confirming radiology report, functional impairment documentation, and the proposed CPT code alongside the S49.011P diagnosis. Submitting through a medical claims clearinghouse that supports real-time eligibility checks reduces authorization lag for these cases.

State Medicaid programs vary in their prior authorization requirements for corrective osteotomy in pediatric patients. Verify the specific state Medicaid addendum before assuming standard commercial rules apply. The CMS guidance on fracture care — available via CMS ICD-10 coding resources — provides the federal baseline, but state programs may add requirements.

Common claim denial reasons for S49.011P

Physeal fracture codes generate a predictable denial pattern. Each item below identifies the denial cause and the corrective action to take before resubmission.

• Incorrect encounter suffix (A instead of P): using the initial encounter character on a follow-up visit is a frequent error. Confirm the visit is not the acute injury date. Corrective action: verify the original date of injury and resubmit with P.
• Missing malunion language in the radiology report: payers require explicit confirmation of malalignment. “Fracture healing in progress” does not support P. Corrective action: obtain an amended radiology addendum specifying alignment, then appeal.
• Laterality mismatch: the claim shows right arm, the operative or therapy note documents left arm. Corrective action: reconcile all source documents before resubmission. Do not assume the claim is correct.
• Salter-Harris type not specified: the claim uses S49.011P (Type I) but the clinical notes only say “physeal fracture.” The code defaults to unspecified (S49.001P). Corrective action: obtain a clinician addendum specifying the Salter-Harris type, or resubmit as S49.001P.
• S suffix used for active malunion treatment: S (sequela) signals the fracture episode is closed. Using it while the malunion is still being managed denies medical necessity for the visit. Corrective action: resubmit with P and document that the fracture-related malunion is the reason for the encounter.
• Missing external cause code (state Medicaid): some state Medicaid programs require mechanism-of-injury codes on fracture claims even at subsequent encounters. Corrective action: check the state addendum and append the relevant W or Y code if required.

Systematic denial management workflows route S49.011P claim failures to a coder review queue instead of a general denied-claims bucket. That shortens resolution time for practices handling high volumes of pediatric orthopedic cases. Cross-referencing against medical billing denial codes helps coders trace each CARC denial reason back to the record that was missing.

External cause codes to report with S49.011P

External cause codes document the mechanism of injury that produced the original physeal fracture. For subsequent encounter codes — including S49.011P — Medicare and most commercial payers do not require external cause codes on follow-up claims. However, some state Medicaid programs require them on subsequent-encounter claims, so verify the payer’s addendum before omitting.

When external cause codes are required, append them as secondary codes. S49.011P remains the principal diagnosis. The mechanism code does not drive reimbursement for subsequent encounters, but its absence can trigger a Medicaid edit in mandating states. Consult the CDC/NCHS ICD-10-CM tool for the current year’s external cause code index when selecting the most specific mechanism code available.

How Pabau helps prevent S49.011P denials

The denials above trace back to three checks: alignment language in the radiology report, the arm named on every note, and the documented Salter-Harris type. When coders run those checks after the claim is built, a mismatch only surfaces as a denial on the remittance.

Pabau, the practice management platform we build, keeps the appointment, the treatment note, and the claim in the same patient record. Coders can read the radiology finding and the documented arm next to the diagnosis before the claim goes out.

Claims leave the practice with the code, the arm, and the suffix already agreeing with the record. Fewer S49.011P follow-ups come back for rework or appeal.

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Conclusion

S49.011P is earned in the radiology report, so start every follow-up claim there. If the report names the deformity, the arm matches across every note, and Type I is documented, the code holds. If any one is missing, code what the record supports instead, whether that is D, K, or S49.001P.

The trade-off is a few minutes at the front of the claim. A check of the report and the notes before submission costs less than an appeal that waits on an amended radiology addendum.

Book a demo to see how Pabau helps your coders catch suffix and laterality errors before a fracture follow-up claim goes out.

Continue your research

Need to understand how clean claims are built? Clean claim submission guide covers the elements that keep fracture follow-up claims from triggering front-end edits.

Dealing with repeated denials on orthopedic codes? Revenue cycle management overview explains how to structure the denial appeal and prevention process across specialties.

Want to understand how clearinghouse submission works? 837 file guide details how EDI claims are transmitted and where S49.011P mapping errors appear in the transaction set.

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