CPT Code 13100: Repair, Complex, Trunk; 1.1 cm to 2.5 cm

Learn to report CPT code 13100 for complex wound repair (1.1–2.5 cm) with layered closure. Includes billing & coding rules.

Use Code

What is complex wound repair (trunk/extremities)?

13100 CPT code is assigned when a provider performs a complex repair—that is, a layered wound closure of the subcutaneous tissue and dermis (often with extensive undermining or tissue rearrangement) for traumatic or surgical wounds measuring 1.1 to 2.5 cm on the trunk or extremities. Because the repair penetrates deeper than the epidermis and frequently involves meticulous hemostasis, it is more resource‑intensive than an intermediate repair or simple wound repair code.

Typical scenarios include:

Complicated lacerations with jagged edges or extensive debridement
Wounds requiring retention sutures to prevent tension
Scar revision with layered closure
Re‑closure of traumatic lacerations after delayed presentation

When to use CPT code 13100

Use this code when a patient presents with a wound requiring more than superficial closure. This includes cases where the wound has irregular edges, underlying tissue damage, or needs closure in layers to promote healing. The repair must go beyond simple skin approximation and involve deeper structures such as subcutaneous tissue, requiring more time and skill to ensure proper healing and cosmetic results.

This type of repair may also follow extensive debridement or be necessary in cases of scar revision, traumatic injuries, or after removal of foreign material. In some instances, tissue adhesive may be used in combination with sutures, but this should be clearly documented in the medical record.

CPT code 13100 documentation requirements

To support the use of CPT code 13100, providers must ensure the medical record clearly reflects the complexity of the wound and closure:

Wound length and location: Document the pre-closure measurement and precise anatomic site of the wound.
Closure technique: Include a detailed description of the layered closure, specifying involvement of subcutaneous tissue, dermis, and epidermis.
Sutures and method: List the suture types, number of layers, use of retention sutures, or any tissue adhesive utilized.
Extent of cleaning or undermining: Note if extensive cleaning or extensive undermining was required before closure.
Medical necessity: Clearly state why the repair qualifies as complex repair and not an intermediate repair.
Additional procedures: Record any secondary procedures or unrelated multiple procedures performed, and assign separate procedure codes when appropriate.

CPT code 13100 billing guidelines

Correct coding ensures appropriate reimbursement and prevents bundling errors when reporting complex wound repair:

Use CPT 13100 only for complex closure: This code applies when the repair meets the CPT definition of complex repair for wounds 1.1 to 2.5 cm.
Add 13101 for longer repairs: If the total wound length exceeds 2.5 cm in the same region, use CPT code 13101 for each additional 5 cm or part thereof.
Avoid code overlap: Do not report 13100 with intermediate or simple wound repair codes for the same site.
Do not combine with adjacent tissue transfer: If the procedure involves tissue rearrangement or flap closure, use the appropriate integumentary system CPT codes instead.
Document scar revisions or trauma repairs carefully: These may qualify for 13100 if they meet the criteria—include thorough supporting details.
Suture removal is usually not billable: If done later, it's only reimbursable if unrelated or outside the global period of the original procedure.

Other relevant CPT codes

CPT code 13101: Each additional 5 cm
Codes in the 12031–12057 range: For intermediate repair, if no undermining or deep layer closure is needed
Codes in the 12001–12021 range: For superficial wound or simple wound repair with epidermal approximation only.

Frequently asked questions

Selecting the appropriate laceration repair code depends on several factors, including anatomic location, wound length, and the complexity of the closure. CPT guidelines outline that repairs are classified into simple, intermediate, or complex categories. These distinctions—standardized by resources like those developed by the American Medical Association—depend on the depth of the wound, involvement of tissue layers, and the method of closure used. Reviewing the code descriptors helps ensure accurate coding for each type of laceration repair.

A simple repair typically involves a single layer closure of the skin and subcutaneous tissue without significant involvement of deeper structures. It often includes minimal cleaning and can be closed with adhesive strips or sutures.

Yes. Specific codes exist when the laceration repair involves sensitive anatomic locations such as the mucous membranes or external genitalia, especially if there's significant involvement of deeper tissues. These situations often require more detailed documentation and may be billed differently from standard skin repairs.