ICD code S43.215D – Anterior dislocation of left sternoclavicular joint

Key takeaways

S43.215D covers anterior dislocation of the left sternoclavicular joint at a subsequent (healing-phase) encounter. Laterality is encoded in the 6th character (5 = left) and encounter type in the 7th character (D).

The 7th character D applies when the patient is receiving routine or healing-phase care. Active initial treatment takes A instead (S43.215A).

A missing or wrong 7th character is the top denial trigger for this code, so confirm the encounter type against the note before submitting.

Pabau, the practice management platform we build, helps orthopedic and sports medicine practices track encounter type across multi-visit shoulder injury claims.

ICD-10 code S43.215D: Quick reference

ICD-10 code S43.215D is the billable code for anterior dislocation of the left sternoclavicular joint, subsequent encounter. Use it for follow-up, rehab and other healing-phase visits after the dislocation has had its initial treatment. The table below lists its status, chapter, category and edition.

What S43.215D means: Breaking down the code

Each segment of S43.215D encodes a specific clinical fact. Reading the code character by character is the fastest way to confirm you have the right one before a claim goes out.

The code is already 7 characters long, so no placeholder X is needed. S43.215D is a valid, fully specified code in the FY 2027 tabular list, and you can confirm it in the CDC/NCHS ICD-10-CM web tool.

Clinical description: Anterior dislocation of the left sternoclavicular joint

The sternoclavicular (SC) joint is where the medial end of the clavicle meets the manubrium of the sternum. It is the only synovial joint that attaches the upper limb to the axial skeleton. There is one on each side of the sternum, so every code in this family has to state which side is affected.

• Mechanism: Anterior SC dislocations typically result from a lateral compressive force applied to the shoulder, driving the medial clavicle anteriorly. Common causes include contact sports injuries, motor vehicle incidents, and falls onto an outstretched arm.
• Presentation: Visible or palpable anterior prominence at the medial clavicle, localized pain, swelling, and restricted shoulder range of motion. Anterior dislocations are far more common than posterior dislocations.
• Distinction from posterior dislocation: A left posterior SC dislocation (S43.225x) is often treated as a surgical emergency. The mediastinal structures sit close behind the joint. Anterior dislocation is generally managed conservatively with closed reduction. The direction of dislocation is what separates S43.215x (anterior) from S43.225x (posterior) in the tabular list.
• Why laterality matters: The 6th character 5 (dislocation, left) separates S43.215D from right-sided S43.214D. It also separates it from S43.216D, which covers an anterior dislocation where the side is unspecified. Payers can and do deny claims where the coded laterality does not match imaging or operative reports.

When to use S43.215D: Subsequent encounter explained

The 7th character D denotes a subsequent encounter. The patient has already received active treatment for the anterior left SC dislocation and is now returning for routine care during healing or recovery.

Per Section I.C.19.a of the ICD-10-CM Official Guidelines, this includes follow-up visits such as sling or cast checks and physical therapy after reduction. Medication adjustment during recovery and wound care after surgery count too.

A common mistake: Coders keep using S43.215A at later visits because it was used at the initial ED encounter. The 7th character switches to D once active treatment is complete and the patient moves into routine healing care.

S43.215A vs S43.215D vs S43.215S: Choosing the right 7th character

All three variants share the same base anatomy, an anterior dislocation of the left SC joint. The 7th character alone decides which one a claim carries, and it is the easiest part of this code family to get wrong.

Codes commonly confused with S43.215D

Several neighboring codes in the S43 category share similar descriptors. Picking the wrong one usually means laterality or dislocation direction was not checked, and it produces immediate payer edits or medical necessity denials.

Four checks in the record settle which code applies, and each wrong answer leads to a different neighbor:

CPT codes commonly billed with S43.215D

On subsequent encounter claims, the paired CPT codes reflect post-reduction care rather than the initial reduction procedure. Understanding the medical billing workflow for traumatic shoulder injuries helps coders anticipate the common pairings and avoid unbundling errors.

Each paired code carries its own billing rules. CPT 99213 turns on medical decision-making or total time, and CPT 97110 is billed in 15-minute units.

CCI edit caution: Bill an E/M service and a procedure on the same date only when both are separately documented. The E/M line then needs a modifier such as modifier 25. CMS publishes the current NCCI edit tables each quarter.

Documentation requirements for S43.215D

A clean claim submission using ICD-10 code S43.215D depends on documentation that establishes three facts: The specific diagnosis, the laterality, and the encounter type. All three must be traceable in the medical record before billing.

• Confirmed anterior left SC dislocation diagnosis: The clinical note, imaging report, or operative report must explicitly document anterior dislocation of the left sternoclavicular joint. “Shoulder injury” or “clavicle pain” alone does not support this specific code.
• Laterality specificity: The note must state left-sided involvement. If imaging says left and the note says right, query the provider before coding rather than assuming.
• Subsequent encounter justification: The record must establish continuity from an earlier initial encounter. Progress notes should reference prior treatment (e.g. “patient returns 3 weeks after closed reduction”). New injuries presenting for the first time require S43.215A, not S43.215D.
• Provider signature and date: All notes must be signed by the treating provider and dated to the encounter date on the claim.
• Imaging references where applicable: Radiology reports confirming dislocation direction and laterality strengthen medical necessity documentation, particularly for payers with shoulder-specific LCDs.

Common reasons S43.215D claims are denied

Payer denials on ICD-10 code S43.215D claims cluster around a few predictable patterns. Effective denial management workflows begin with understanding which pattern triggered a specific rejection.

Sorting denials by their medical billing denial codes shows whether a problem is coder-specific, provider-specific, or payer-specific. That answer decides the right intervention.

Payer requirements and prior authorization

Prior authorization requirements for subsequent encounter visits billed with S43.215D vary by payer, plan, and geography. No universal rule applies. The following reflects general industry patterns, so verify against the payer’s LCD, plan documents, or provider manual before submitting.

• Medicare: Follow-up office visits (E/M) for healing-phase shoulder care typically do not require prior authorization. Associated procedures may still fall under Local Coverage Determination (LCD) requirements, such as shoulder manipulation or physical therapy beyond a threshold visit count. Check your Medicare Administrative Contractor for applicable LCDs covering musculoskeletal rehabilitation.
• Medicaid: Prior authorization thresholds vary significantly by state. Some state Medicaid programs require authorization for physical therapy after the first 6-12 visits. Query the state Medicaid portal or MCO plan for specifics.
• Commercial payers: Many commercial plans require prior authorization when physical therapy extends beyond a defined visit limit (commonly 20-30 visits per plan year). The diagnosis code S43.215D supporting the continued therapy visits must appear in the authorization request.
• Frequency limitations: Payers may limit follow-up orthopedic visit frequency during the healing phase. Documentation of clinical progress at each subsequent encounter visit substantiates medical necessity for continued billing.

ICD-10-CM official coding guidelines for S43.215D

S43.215D falls under Chapter 19 of ICD-10-CM (Injury, poisoning and certain other consequences of external causes). Section I.C.19 of the ICD-10-CM Official Guidelines for Coding and Reporting governs it. The provisions below are confirmed via the CMS ICD-10-CM Official Guidelines.

• 7th character requirement: All codes in category S43 that require a 7th character extension must use the appropriate character to be valid and billable. S43.215D already contains 7 characters, so no placeholder X is required.
• Highest specificity rule: Code to the highest level of specificity supported by the documentation. S43.215D (anterior, left, subsequent encounter) is more specific than S43.205D (unspecified direction) and must be used when the documentation supports it.
• Laterality: When laterality is not documented, assign the unspecified-joint code, e.g. S43.216D. Do not assume left or right.
• Sequencing: On subsequent encounter claims, S43.215D is generally the principal or first-listed diagnosis for visits focused on the shoulder injury. Codes for complicating conditions, external cause, or place of occurrence may follow per standard sequencing guidelines.
• External cause codes: ICD-10-CM guidelines recommend reporting an external cause code (Chapter 20, V01-Y99) alongside the injury code when the mechanism is known. This is not strictly required for payment but supports complete documentation and epidemiological accuracy.

A clearinghouse that validates ICD-10-CM code format and payer-specific edits before transmission catches format errors before they become rejections.

Use the Check ICD-10 lookup tool to confirm S43.215D against the current fiscal year’s tabular list before billing.

How Pabau keeps S43.215D claims on the right 7th character

Coders usually confirm the encounter type by reading back through earlier notes to see whether the reduction already happened. On a shoulder injury billed across many follow-up visits, that check repeats at every charge entry.

Pabau keeps the notes, imaging reports and claim history for each patient in one record. Its error-catching claims management lets coders see the earlier encounter before choosing A, D or S.

Claims go out through the Claim.MD integration, which runs eligibility verification and payer-specific edit checks before submission. Payments come back as electronic remittance advice, so a 7th-character denial shows up against the claim that caused it.

Reduce ICD-10 coding errors across your practice

Pabau helps orthopedic and sports medicine practices track encounter type, laterality and 7th character selection. Mismatches surface before the claim reaches the payer.

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Conclusion

Treat the switch from A to D as a documented event, not a coder’s judgment call. Once the note records that active treatment is done, each healing-phase visit takes the D code. The code moves to S only when the record describes a late effect.

The cost of checking is a few seconds per claim. The cost of skipping it is a denial, a resubmission and a delayed payment on a multi-visit injury. Book a demo to see how Pabau tracks encounter type across every follow-up visit.

Continue your research

Need guidance on denial management workflows? Denial management in healthcare covers how to build systematic processes for tracking and resolving common payer rejections.

Preparing a clean claim for shoulder injury billing? Clean claim submission outlines the documentation and format requirements payers check before adjudicating a claim.

Want to understand clearinghouse workflows? Medical claims clearinghouse explains how clearinghouses validate, format, and route claims to payers on your behalf.

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