ICD code S25.122D – Left innominate or subclavian artery major laceration

Key takeaways

S25.122D is the billable ICD-10-CM code for a major laceration of the left innominate or subclavian artery at a subsequent encounter.

The seventh character D covers routine care while the injury heals after active treatment ends. The active treatment episode itself is coded S25.122A.

The sixth character 2 means left. A right-sided injury is S25.121D, and an injury with no side documented is S25.129D.

A laceration documented without a severity qualifier codes to minor laceration (S25.11-), so the record must state major laceration, complete transection or traumatic rupture.

Pabau, the practice software we build, pre-fills claims from the patient record and submits them through Claim.MD.

ICD-10 code S25.122D is the follow-up code for a major left artery laceration

ICD-10 code S25.122D is the billable ICD-10-CM code for “Major laceration of left innominate or subclavian artery, subsequent encounter.” You use it once the emergency repair is done and the patient comes back for routine care while the vessel heals.

The seventh character carries the most weight. A follow-up billed with A tells the payer that active treatment is still underway, while the visit note says it has ended. That mismatch is one of the fastest routes to a denial.

The code has been valid since October 1, 2015, and it stays valid in the current release. Below, you’ll see how each character is chosen, what the record must show and how a clean follow-up claim moves.

Each character after the category does one job. The fifth character 2 marks a major laceration, and the sixth character 2 marks the left side. The seventh character D marks a subsequent encounter, and the diagram below shows the options at each position.

On the left, S25.122D almost always means the subclavian artery

In typical anatomy, the innominate artery, also called the brachiocephalic artery, is a right-sided vessel. It rises from the aortic arch and divides into the right common carotid and right subclavian arteries. On the left, there is usually no innominate artery, because the left subclavian artery branches directly off the aortic arch.

That means S25.122D almost always describes an injury to the left subclavian artery. A left innominate artery only appears in rare arch variants, such as a right-sided aortic arch with mirror-image branching. Either way, the operative report or attending note must name the vessel and state that it is on the left.

The seventh character D starts when active treatment ends

The seventh character D means the patient is receiving routine care while the injury heals, after active treatment is complete. Under the ICD-10-CM Official Guidelines (Section I.C.19.a), “subsequent” does not mean the second visit. It means the patient has moved past the active treatment phase.

Vascular repairs have no healing marker as clear as a fracture line on an X-ray. The visit note should therefore state that active repair is complete and the patient is in the healing or monitoring phase. That statement is what supports the D character if the claim is reviewed.

S25.122D covers complete transection and traumatic rupture only

So what counts as major? S25.122D covers a complete transection or traumatic rupture of the left innominate or subclavian artery, coded at a subsequent encounter. Those are the two inclusion terms the tabular list gives for the S25.12 major laceration subcategory.

• Included: Complete transection or traumatic rupture of the left innominate or subclavian artery, at visits after active treatment has ended.
• Minor laceration: Incomplete transection, superficial laceration and laceration NOS of the left vessel code to S25.112D. Do not assign major severity without explicit documentation.
• Unspecified injury: An injury of the left vessel with no type documented codes to S25.102D.
• Unspecified side: S25.129D applies when the record does not state right or left. Query the provider before defaulting to it.
• Thoracic aorta: Aortic injuries code to S25.0-, not S25.1-, even though the left subclavian artery branches from the aortic arch.
• Innominate or subclavian vein: Venous injuries code to S25.3-, not to the artery codes.
• Intercostal vessels: Injuries to the intercostal blood vessels code to S25.5-.

One wrong character turns S25.122D into a different code

Severity, side and encounter type decide the code in this family. Get any one of them wrong and the claim carries a different code, as the table below shows.

The minor-laceration trap works the same way on the right side, where an unqualified laceration codes to S25.111D. Before you swap in any neighbor, read its full descriptor in the tabular list or our diagnostic code library.

Documentation for S25.122D must name the vessel, side and severity

The medical record must support every element of the code. Good medical billing documentation starts with the operative or emergency report and carries through each follow-up note.

• Vessel identification: The note must name the left subclavian artery, or the left innominate artery where an arch variant exists. “Left thoracic vessel” is not enough.
• Severity: The record must describe a major laceration, complete transection or traumatic rupture. A laceration with no severity qualifier codes to minor laceration (S25.112D).
• Encounter status: The follow-up note should confirm that active treatment has ended and the patient is in the healing or monitoring phase.
• Associated open wound: Category S25 instructs coders to code also any associated open wound of the thorax (S21.-).
• Supporting imaging: Post-operative CT angiography or duplex ultrasound reports should be referenced in the visit note and kept in the record.
• Service code: The claim needs a CPT code for the service performed. Follow-up visits commonly pair with E/M codes such as 99213 or 99214, or with the imaging study performed.

Billing S25.122D means matching the claim to the visit note

S25.122D is valid on HIPAA-standard electronic claims, but the seventh character must match what the visit note describes. Submitting a clean claim for this code means the vessel, side, severity, encounter type and service code all agree.

Some payers require prior authorization for imaging after a major vascular repair. Check the payer’s policy before scheduling post-operative angiography and billing it alongside S25.122D.

How a follow-up claim for S25.122D moves from visit to payment

Here’s a typical path. A patient’s left subclavian artery transection was repaired in the hospital. Six weeks later, they see the vascular surgeon for a duplex ultrasound check.

1. Visit note: The surgeon confirms the repair is complete and records the duplex findings. That statement supports the D character.
2. Code assignment: The coder assigns S25.122D, plus an S21.- open wound code if the record documents one.
3. Service code: Inside the 90-day global period of the repair, the surgeon’s routine follow-up is part of the surgical package. It is reported with CPT 99024, which carries no separate payment.
4. Scrub and submit: The claim passes clearinghouse edits before it reaches the payer.
5. Remittance: The payer pays, adjusts or denies the claim, and the team posts the result against the visit.

That last step is where the money shows up. The payer’s electronic remittance advice explains each payment or adjustment. Posting it promptly keeps revenue cycle management accurate across a long recovery.

Run this checklist before you submit

• The note names the left subclavian artery, or the left innominate artery in an arch variant.
• The note states major laceration, complete transection or traumatic rupture.
• The note confirms active treatment has ended.
• The seventh character is D, not A or S.
• Any documented open wound of the thorax has its own S21.- code.
• The CPT code matches the service, and global-period visits use 99024.
• The main reason for the visit is sequenced first.

Five mistakes that get S25.122D claims denied

1. Wrong encounter type: S25.122A is billed for a follow-up visit after active treatment has ended. The seventh character must reflect the current encounter, not the original injury.
2. Side not documented: The record says “subclavian artery injury” without naming the left side. The documentation then supports only S25.129D, so S25.122D will not stand up on review.
3. Wrong side: The left-sided code is swapped for its right-sided neighbor, S25.121D, or the reverse. Check the sixth character against the operative report.
4. Severity not documented as major: The note describes a laceration with no severity qualifier. That codes to minor laceration, and a major-laceration claim fails on retrospective review.
5. Incorrect sequencing: S25.122D is listed first when the visit was mainly for another condition. Sequence the main reason for the visit first.

Two codes signal a coding problem when a claim comes back. Claim adjustment reason code 11, usually returned with group code CO, means the payer found the diagnosis inconsistent with the procedure billed. Remark code MA130 means the claim was unprocessable because information was missing or invalid.

An MA130 claim carries no appeal rights, so the fix is a corrected, resubmitted claim. A structured denial management workflow sorts returned claims by these codes, so each one goes straight to the right fix.

How Pabau keeps S25.122D claims tied to the patient record

Many practices still look up injury codes in one tool and type them into a claim in another. Each retyped character is a chance to swap a 2 for a 1 or a D for an A.

Pabau’s claims management tools pull patient, treatment and insurer details from the patient record into a pre-filled claim. Pabau runs validation checks and keeps Send disabled until required details are filled in.

Claims then go out through Pabau’s Claim.MD integration, and each claim’s status stays visible in the same platform. Across a long vascular recovery, every follow-up claim stays linked to one patient record.

Pre-fill and submit injury claims in one place

Pabau lets your team pre-fill claims from the patient record, validate them before sending and submit them through Claim.MD. See how it fits your practice.

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Conclusion

S25.122D is narrow, and that is where claims go wrong. The side, the severity and the encounter type each change the code, and a left subclavian injury is easy to file under its right-sided neighbor.

Make the operative report name the left vessel and the severity, and make every follow-up note confirm that active treatment has ended. With those two habits in place, the code on the claim matches the record. Watch the global period too, because a surgeon’s routine follow-up inside it is already paid through the surgical fee.

Book a demo to see how Pabau keeps claim pre-fill, validation and Claim.MD submission together for your practice.

Continue your research

Need to understand clearinghouse submissions for ICD-10 claims? Medical claims clearinghouse guide explains how electronic claim routing and payer edits work for diagnosis-coded submissions.

Want to build a cleaner billing workflow around injury codes? Superbill documentation guide covers how to structure encounter documentation so ICD-10 codes are supported at the point of service.

Looking for guidance on ICD-10 billing compliance? Medical billing compliance overview outlines documentation and coding standards that apply to complex diagnosis codes like S25.122D.

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