ICD-10 code S42.032S: Displaced lateral end clavicle fracture, sequela

Key takeaways

ICD-10 code S42.032S describes a displaced fracture of the lateral (acromial) end of the left clavicle, reported as a sequela.

The lateral end meets the acromion at the acromioclavicular joint, so S42.032S never covers a sternal-end injury.

Sternal-end clavicle fractures belong to S42.01x, and shaft fractures belong to S42.02x.

S42.032S is billable for FY2026, and a sequela claim lists the residual condition code ahead of it.

Practice management software like Pabau carries a diagnosis code library that flags incomplete sequela pairs before submission.

ICD-10 code S42.032S is a billable, specific diagnosis code under the CMS ICD-10-CM classification system for FY2026. It describes a displaced fracture of the lateral end of the left clavicle, reported as a sequela encounter. Coders and clinicians use it when a patient presents with a late effect of an old clavicle fracture, rather than during active fracture treatment.

The code sits within the S42 block (“Fracture of shoulder and upper arm”) of the ICD-10-CM tabular list, under subcategory S42.0 for clavicle fractures. Its seven characters make it valid for direct submission on a claim, with no more specific child code to reach for. The lateral-end group is S42.03x, which is easy to confuse with the sternal-end group S42.01x.

Code breakdown: Understanding S42.032S

Each character in ICD-10 code S42.032S carries specific clinical meaning. Reading the code component by component prevents selection errors and supports clean claim submission. For practices using a physical therapy EMR, understanding this structure also helps automate code validation at the point of documentation.

Within the lateral-end group, the 6th character carries both displacement and side. Values 1, 2, and 3 cover displaced fractures of the right, left, and unspecified clavicle. Values 4, 5, and 6 cover the nondisplaced equivalents in the same order.

Submitting the unspecified variant S42.033S when the record documents a left-sided injury is a common documentation error, and one that draws payer audits. Review guidance from the AAPC’s ICD-10-CM code reference for more detail on laterality rules within the S42 block.

The 7th character ‘S’: Sequela coding rules

Sequela coding is one of the most frequently misapplied concepts in ICD-10-CM Chapter 19. The WHO’s ICD-10 classification framework defines a sequela as a late effect. It is a residual condition that persists after the acute phase of an injury resolves.

S42.032 accepts seven 7th characters. A and B cover initial encounters, D, G, K, and P cover subsequent encounters, and S covers sequela. Most encounters turn on A, D, and S, which are also the three that coders confuse most often. Practices using HIPAA compliance software can build these rules into documentation templates, which cuts manual errors.

Aftercare vs sequela: Coding the correct encounter type

Coders frequently confuse the ‘S’ sequela extension with ‘D’ (subsequent encounter), ‘P’ (subsequent encounter with malunion), or Z-code aftercare. Each maps to a distinct clinical scenario, and selecting the wrong one can result in claim denial.

The sequela rule under ICD-10-CM Official Guidelines Section I.B.10 requires two codes on a sequela encounter. The residual condition comes first, for example M19.112 for post-traumatic osteoarthritis of the left shoulder or M25.512 for left shoulder pain. The injury code with the ‘S’ extension, S42.032S, follows it.

Coding only S42.032S, with no companion residual condition code, is incomplete and may be rejected during adjudication. Traumatic fractures also don’t take aftercare Z codes. Healing-phase care belongs on the fracture code itself, with 7th character D, G, K, or P instead.

Clavicle fracture ICD-10 code hierarchy: S42.0 family

S42.032S belongs to the S42.0 subcategory, which covers every clavicle fracture. The lateral-end group S42.03x separates injuries at the acromial end of the bone from shaft fractures (S42.02x) and sternal-end fractures (S42.01x). Knowing the full sibling set helps coders move quickly when laterality or displacement changes between encounters. Practices working in sports medicine software environments see the whole S42.03x range across a season.

The displaced versus nondisplaced split reflects whether bone fragments have shifted out of anatomical alignment. A displaced lateral-end fracture often means the coracoclavicular ligaments have failed. The acromioclavicular joint is then involved, and the sequela is more likely to matter clinically. Verify the sibling set against the CDC/NCHS ICD-10-CM web tool for the current fiscal year to confirm active status.

Anatomical reference: The lateral end of the clavicle

The lateral end of the clavicle is its outer extremity, articulating with the acromion of the scapula at the acromioclavicular (AC) joint. Fractures at this end account for roughly 10% to 30% of clavicle fractures, well behind midshaft injuries, according to StatPearls.

Stability here depends on two structures: the AC joint capsule and the coracoclavicular ligaments, the conoid and the trapezoid. Whether those ligaments survive the injury decides how the fracture behaves, and therefore what sequela the patient is left with.

Surgeons grade these injuries with the Neer classification, and the grade predicts the outcome. In a Neer type II pattern, the fracture line runs medial to the coracoclavicular ligaments. The medial fragment loses its restraint and rides upward with the trapezius, while the weight of the arm drags the lateral fragment down. Nonunion after nonoperative care is reported in up to roughly 30% of these fractures. That’s why lateral-end injuries so often generate a sequela encounter years later.

• Mechanism: A direct blow to the point of the shoulder is the usual cause. Falls onto the shoulder, cycling crashes, and contact-sport collisions dominate the caseload.
• Displacement patterns: Displacement follows the ligament injury. When the coracoclavicular ligaments tear, the medial fragment displaces superiorly and the fracture becomes unstable.
• Residual conditions: Common sequelae include nonunion, malunion, and post-traumatic AC joint osteoarthritis. Patients also report a palpable bump, pain on overhead movement, and lost range of motion.
• Laterality in clinical records: Operative and imaging reports should state left or right plainly. Left-sided injuries map to S42.032S, and right-sided injuries map to S42.031S.
• Not the sternal end: A medial-end fracture sits at the sternoclavicular joint and belongs in S42.01x. The two groups describe opposite ends of the same bone.

When documenting the residual condition behind a sequela encounter, clinicians should name the late effect exactly. Vague wording such as “shoulder pain following prior fracture” is hard to defend in an audit. “Malunion of the lateral end of the left clavicle with restricted overhead elevation” gives a payer what it needs. Practices tightening musculoskeletal record quality can review physical therapy compliance for broader clinical record standards.

Documentation requirements for a sequela claim

A sequela claim stands or falls on the note behind it. Six elements make S42.032S defensible when a payer asks for records.

• Fracture site and side: State the lateral end of the left clavicle. “Collarbone fracture” cannot be coded to this level of specificity.
• Displacement status: Record displaced or nondisplaced, because that choice moves the 6th character between 2 and 5.
• The original injury: Note the approximate date and mechanism of the fracture that has since healed.
• The residual condition: Name the late effect, such as malunion, nonunion, AC joint osteoarthritis, or restricted elevation, and code it first.
• The causal link: Say in the note that the current condition results from the earlier fracture. Payers look for that sentence.
• Treatment history and function: Record prior fixation or sling management, past therapy, and the patient’s current functional limits.

Templates that hold these six fields as structured entries keep the record consistent between clinicians. They also make the causal link searchable later, which matters when a claim is reviewed months after the visit.

Billing and reimbursement: Using S42.032S in claims

S42.032S is accepted by Medicare, Medicaid, and commercial payers as a valid diagnosis code for FY2026. As a sequela-designated code, it tells the payer that this encounter treats a late effect rather than an acute injury. Several billing considerations follow from that.

• Sequence correctly: The residual condition code, for example M19.112 or M25.512, is listed first. S42.032S follows it as the causal code.
• Do not pair with aftercare Z codes: Traumatic fracture care never takes a Z47.89-style aftercare code. The two frameworks are mutually exclusive on the same encounter.
• Payer-specific rules apply: Some payers hold LCD or NCD policies governing sequela code reimbursement. Verify coverage with the MAC or the commercial payer before submission.
• Common associated CPT codes: Therapeutic activities and therapeutic exercises are billed under 97530 and 97110. Office visits run from 99213 to 99215. These examples are illustrative only, and bundling rules vary by payer.

Reducing claim errors on sequela encounters starts at documentation. Practices that use integrated claims management software can build validation rules that flag a missing residual condition code before submission. That closes the most common denial pattern for this code, where S42.032S arrives alone.

Common coding mistakes with S42.032S

Four errors account for most rejected claims carrying this code. Each one is visible in the note before the claim goes out.

Coding the sternal end by mistake

S42.032S is a lateral-end code. When the record describes a medial-end injury at the sternoclavicular joint, the sequela code belongs in the S42.01x group instead, such as S42.012S. The two families read alike in a code lookup, yet they sit at opposite ends of the clavicle. That’s why the swap can survive in a chart for years.

Defaulting to the unspecified side

S42.033S covers an unspecified clavicle, and it should be rare. If the imaging report names the left side, the claim carries S42.032S. Unspecified codes on a laterality-specific injury are a standard audit trigger.

Submitting the sequela code alone

A sequela encounter needs two codes, and the residual condition is sequenced first. A claim that lists only S42.032S gives the payer no medical reason for the visit, so it is often denied on the first pass.

Choosing ‘S’ when ‘P’ or ‘K’ fits better

While the fracture is still under active follow-up, malunion and nonunion each take their own 7th character. Use ‘P’ for malunion, as S42.242P does, and ‘K’ for nonunion, as in S42.242K. Reserve ‘S’ for the point where the fracture episode has closed. By then the residual condition itself is the reason the patient booked in.

Clinical scenarios: When S42.032S applies

Three short scenarios show where the code fits, and where it does not.

Scenario 1: AC joint pain two years after a cycling crash

A 38-year-old presents with left AC joint pain and a visible bump. Imaging shows a healed, malunited fracture of the lateral end of the left clavicle. Code the residual condition first, then S42.032S as the cause.

Scenario 2: Physical therapy six weeks after injury

The same fracture is still healing and the patient is in therapy for range of motion. This is a subsequent encounter, not a sequela, so the claim carries S42.032D instead.

Scenario 3: Old fracture at the wrong end of the bone

A patient reports chronic pain at the sternoclavicular joint after an old left clavicle injury. The site is the medial end, so the sequela code comes from S42.01x, not from S42.03x.

Related clavicle fracture sequela ICD-10 codes

When clavicle sequela coding moves beyond the lateral end, coders need the wider S42.0xx family. The table below gathers the sequela codes referenced most often across the three fracture sites. Neighboring shoulder-girdle sequelae follow the same pattern, including S42.126S at the acromion.

How practice management software supports accurate ICD-10 coding

Sequela coding errors cost practices time and revenue. Submitting S42.032S without its companion residual condition code, or picking the wrong 7th character, produces denials that need manual review and a resubmission cycle. Practice management software like Pabau removes most of that friction at the point of documentation.

Pabau’s claims tools include a built-in diagnosis code library that clinicians and coders reach from inside the note. It can flag a sequela-coded encounter with no residual condition code attached, so fewer S42.032S claims leave the practice incomplete. Teams handling post-fracture rehabilitation can pair that with Pabau’s digital intake forms, which capture the specifics of a residual condition before the appointment starts.

Structured documentation also lowers the audit risk that sequela claims carry. Notes that record the residual condition and its link to the original fracture give the practice the evidence a payer asks for. Explore how clinical documentation software improves coding accuracy and throughput at once. For practices mapping the wider picture, patient care management workflows connect record quality directly to clean claim rates.

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Conclusion

Two decisions carry S42.032S. The first is anatomical: the lateral end sits at the AC joint, and a medial-end injury belongs in S42.01x however similar the descriptions look. The second is sequencing, because the residual condition code goes first or the claim comes back.

Get both right in the note and the claim follows without argument. If your practice handles post-fracture or musculoskeletal caseloads, build the check into documentation rather than into a billing review at the end of the month. Book a demo to see how Pabau validates ICD-10 codes across your clinical specialties.

Continue your research

Coding a fracture that is still healing? S42.212D covers the subsequent-encounter rules that apply before a sequela code is correct.

Need the delayed-healing extension instead? S42.475G shows how ‘G’ works when a fracture heals slowly and the episode stays open.

Managing compliance documentation across your practice? Physical therapy compliance outlines the documentation standards that support clean ICD-10 submissions.

Want faster notes without losing coding detail? Clinical documentation software shows how structured templates keep diagnosis detail inside the record.

Want to improve patient record quality end to end? Patient care management explains how structured intake and follow-up feed accurate diagnosis coding.

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