🩹 CPT 15100 — Split-Thickness Autograft, Trunk, Arms, Legs; First 100 Sq Cm Or Less, Or 1% Of Body Area Of Infants And Children (Except 15050)
Quick Reference
wRVU: 9.65 | Global Period: 090 | Assistant Payable: Yes | Bilateral Indicator: 1 Rule: This is a 90-day major surgery global package, so all typical postoperative visits related to graft healing are bundled into the single payment.³ The bilateral indicator of 1 means the 150% payment adjustment applies when grafts are placed on paired trunk/limb sites bilaterally in the same session, reported with modifier -50 or paired -RT/-LT modifiers. Assistant-at-surgery is generally payable for this procedure given its complexity, subject to documentation of medical necessity.⁴ Because donor and recipient sites are both part of the same anatomic region group (trunk/arms/legs), no separate graft-harvest code is reported.
📋 Clinical Description
CPT 15100 describes the surgical application of a split-thickness skin autograft — a thin layer of epidermis and partial dermis harvested from the patient’s own trunk, arm, or leg — onto a prepared recipient wound in the same body region group, covering the first 100 sq cm of surface area or up to 1% of body area in infants and children. The graft is meshed or applied as a sheet, secured with sutures, staples, or tissue adhesive, and dressed to promote vascular ingrowth (“take”) over the following days. Unlike 15120, which reports the identical first-100-sq-cm autograft technique but is restricted to specialized cosmetically or functionally sensitive sites (face, scalp, eyelids, mouth, neck, ears, orbits, genitalia, hands, feet, or multiple digits), CPT 15100 is limited to the trunk, arms, and legs.
Compared with skin substitute application codes such as 15271, CPT 15100 involves autologous (self) tissue rather than biologic or synthetic skin substitute material, which changes both the clinical indication and payer coverage rules significantly. Wound bed preparation — excision of eschar, granulation tissue, or necrotic debris — is not bundled into 15100 and must be reported separately using surgical preparation codes when performed at a different anatomic depth or session criteria are met.⁵
This procedure may be performed in the following clinical contexts:
- Traumatic wound closure — Following degloving injuries, avulsions, or large lacerations on the trunk or extremities where primary closure is not feasible due to tissue loss.
- Burn reconstruction — To resurface partial- or full-thickness thermal, chemical, or electrical burn wounds on the trunk, arms, or legs after adequate debridement and stabilization.
- Chronic wound closure — For diabetic, venous, or pressure ulcers refractory to conservative wound care once granulation tissue is well established.
- Post-tumor excision defects — To close surgical defects remaining after excision of skin cancers or soft tissue tumors on the trunk or limbs.
- Post-infection or necrotizing soft tissue defects — After surgical debridement of necrotizing fasciitis or severe cellulitis has created a large soft tissue defect requiring durable coverage.
🔬 Anatomical & Procedural Considerations
| Variant | Mechanism |
|---|---|
| Sheet Graft | The harvested split-thickness skin is applied to the recipient bed as a single unbroken sheet, without meshing or perforation. This provides the best cosmetic outcome and is typically reserved for visible or functionally important trunk and limb areas. Sheet grafts require a very clean, well-vascularized recipient bed since fluid cannot escape through the graft as easily as with meshed grafts. |
| Meshed Graft | The donor skin is passed through a mesher to create a fenestrated pattern, allowing expansion of the graft to cover a larger recipient area from a smaller donor site. Meshing also allows serous fluid and blood to drain through the graft interstices, reducing the risk of hematoma or seroma lifting the graft. This variant is common for large burn or trauma wounds where donor site skin is limited. |
| Pediatric/Infant Application | For infants and children, the code descriptor allows billing based on 1% of total body surface area instead of a fixed 100 sq cm, reflecting proportionally smaller graftable donor and recipient areas. Documentation should reference percentage of body surface area calculated using a pediatric-specific chart (e.g., Lund-Browder) rather than the adult rule of nines. This distinction is critical for correct unit calculation when reporting the add-on code 15101. |
Clinical Pearl
Always confirm the anatomic site documented in the operative note matches the trunk/arms/legs description for 15100 rather than the specialized-site descriptor used for 15120; misreporting anatomic location is one of the most common audit findings for skin graft claims. Also verify the recipient wound size in square centimeters is explicitly stated, since payers frequently deny claims lacking measurable documentation to support unit calculations for the add-on code.⁶
✅ Procedure Includes
- Harvesting the split-thickness donor skin graft from the trunk, arm, or leg donor site using a dermatome or similar instrument.
- Meshing or preparing the graft as a sheet graft based on surgeon’s clinical judgment.
- Transfer and precise application of the graft onto the prepared recipient wound bed.
- Securing the graft with sutures, staples, skin adhesive, or bolster dressing.
- Application of a standard postoperative dressing to both donor and recipient sites.
- Routine postoperative wound checks included within the 90-day global period.
❌ Excludes / Do Not Report Together
| Code | Description | Relationship |
|---|---|---|
| 15101 | Split-thickness autograft, trunk, arms, legs; each additional 100 sq cm | Add-on code reported only in conjunction with 15100 for graft area beyond the first 100 sq cm; it cannot be billed as a stand-alone service and carries no independent global period. |
| 15120 | Split-thickness autograft, face, scalp, eyelids, mouth, neck, ears, orbits, genitalia, hands, feet, and/or multiple digits; first 100 sq cm | Mutually exclusive by anatomic site with 15100; the two codes should not be reported together for the same graft unless truly separate, distinct anatomic sites are grafted in the same session. |
| 15002 | Surgical preparation or creation of recipient site by excision of open wounds, burn eschar, or scar; first 100 sq cm, trunk, arms, legs | Separately reportable when significant wound bed debridement is performed at a distinct depth or session from simple graft placement; not bundled into 15100 but frequently reported together when clinically indicated.⁵ |
| 15271 | Application of skin substitute graft, trunk, arms, legs; first 25 sq cm or less | Represents a different graft material (biologic/synthetic skin substitute rather than autologous tissue) and is not reported for the same wound area as 15100 in the same operative session. |
Bundling Alert
Because CPT 15100 carries a 90-day global period, any evaluation and management visits, dressing changes, or minor wound checks performed within that window related to the graft are bundled into the global fee and are not separately billable without modifier -24 or -79 to document an unrelated service. Auditors frequently flag claims where surgical preparation codes (15002) are billed on the same date without clear documentation distinguishing debridement from simple graft-bed cleansing, so operative notes must explicitly describe both steps as separate, medically necessary components.
🌳 Code Tree — Surgery: Integumentary System
CPT 15002-15278 Skin Replacement Surgery and Skin Substitutes
│
├── 15002-15005 Surgical Preparation (Recipient Site)
│ ├── 15002 Surgical preparation, trunk/arms/legs, first 100 sq cm
│ └── 15004 Surgical preparation, face/scalp/hands/feet, first 100 sq cm
│
├── 15040-15078 Skin Substitute Grafts and Tissue-Cultured Autografts
│ ├── 15040 Harvest of skin for tissue cultured skin autograft
│ ├── 15050 Pinch graft, single or multiple, to cover small ulcer or defect
│ ├── ▶▶ 15100 ◀◀ Split-thickness autograft, trunk/arms/legs; first 100 sq cm ← YOU ARE HERE (Global: 090)
│ ├── 15101 Split-thickness autograft, trunk/arms/legs; each additional 100 sq cm (Global: ZZZ)
│ ├── 15120 Split-thickness autograft, face/scalp/genitalia/hands/feet; first 100 sq cm (Global: 090)
│ └── 15121 Split-thickness autograft, face/scalp/genitalia/hands/feet; each additional 100 sq cm (Global: ZZZ)
│
└── 15271-15278 Application of Skin Substitute Grafts
├── 15271 Skin substitute graft, trunk/arms/legs; first 25 sq cm or less
└── 15275 Skin substitute graft, face/scalp/hands/feet; first 25 sq cm or less💰 RVU & Reimbursement Profile
| Component | Value |
|---|---|
| Work RVU | 9.65 |
| Global Period | 090 |
| Bilateral Indicator | 1 (150% adjustment applies) |
| Assistant Surgeon | Payable (documentation-dependent) |
| Co-Surgeon | Not typically applicable |
| Team Surgery | Not typically applicable |
| PC/TC Split | 0 — Physician service, PC/TC concept does not apply |
| Modifier -51 Exempt | No |
| Anesthesia | Typically reported separately by an anesthesia provider using the corresponding integumentary anesthesia base unit code |
Bilateral Billing Rules
When grafts are applied to symmetric trunk or limb sites bilaterally in one operative session, report 15100 once with modifier -50 rather than reporting the code twice with -RT and -LT separately. Under bilateral indicator 1, Medicare bases payment on 150% of the single-code fee schedule amount rather than doubling the full fee. If the graft areas are non-symmetric but both exceed 100 sq cm, use the add-on code 15101 to capture the additional area rather than duplicating the base code.
🏷️ Modifier Reference
| Modifier | Name | When to Apply |
|---|---|---|
| -RT | Right Side | Append when the recipient graft site is clearly documented as the right side of the trunk, arm, or leg. |
| -LT | Left Side | Append when the recipient graft site is clearly documented as the left side of the trunk, arm, or leg. |
| -50 | Bilateral | Use when grafts are placed on both right and left corresponding sites in the same operative session, triggering the 150% bilateral payment adjustment. |
| -22 | Increased Procedural Services | Apply when graft complexity, size, or difficulty substantially exceeds the typical work described by the code, with supporting documentation of the additional time and effort. |
| -51 | Multiple Procedures | Use when 15100 is reported with other significant, separately payable surgical procedures during the same session, subject to multiple-procedure payment reduction rules. |
| -52 | Reduced Services | Apply when the graft procedure is electively reduced in scope from what is typically performed, such as a smaller-than-usual graft area relative to the planned procedure. |
| -58 | Staged Procedure | Use when a planned staged graft procedure is performed by the same physician during the 90-day global period of a prior related surgery. |
| -59 | Distinct Procedural Service | Apply when 15100 represents a distinct procedure or session from another same-day service that might otherwise be bundled under NCCI edits. |
| -78 | Return to Operating Room | Use when the patient requires an unplanned return to the OR for a related complication, such as graft failure, during the global period. |
| -79 | Unrelated Procedure | Apply when an unrelated procedure is performed by the same physician during the 90-day global period following the original graft surgery. |
🩺 Common ICD-10-CM Pairings
Primary Diagnosis Group
| ICD-10 | Description | HCC? | Notes |
|---|---|---|---|
| T21.31XA | Burn of third degree of trunk, unspecified site, initial encounter | No | Common primary indication when a full-thickness trunk burn requires autograft closure after adequate debridement and stabilization. |
| L97.929 | Non-pressure chronic ulcer of unspecified part of unspecified lower leg with unspecified severity | No | Reported when a chronic non-healing lower extremity ulcer has been adequately prepared and requires autograft coverage; specificity to laterality and depth is strongly preferred when documented. |
| S71.101A | Unspecified open wound, right hip, initial encounter | No | Used for traumatic soft tissue loss on the trunk/hip region requiring split-thickness autograft closure during the initial encounter. |
Secondary Group
| ICD-10 | Description | HCC? | Notes |
|---|---|---|---|
| Z48.813 | Encounter for surgical aftercare following surgery on the skin and subcutaneous tissue | No | Appropriate for staged follow-up encounters within the global period related to graft site care. |
| L90.5 | Scar conditions and fibrosis of skin | No | Reported when a prior scar contracture is the underlying reason a graft procedure is being performed for functional release. |
Etiology / Complication
| ICD-10 | Description | HCC? | Notes |
|---|---|---|---|
| E11.622 | Type 2 diabetes mellitus with skin ulcer | Yes | Establishes the underlying etiology driving a chronic wound requiring graft closure and supports HCC risk-adjustment documentation. |
| I83.012 | Varicose veins of left lower extremity with ulcer of calf | No | Documents venous insufficiency as the etiologic driver of a chronic leg ulcer requiring split-thickness autograft coverage. |
Coding Specificity Reminder
Always code to the highest level of specificity available in the documentation, including laterality, encounter type (initial, subsequent, sequela), and, for ulcers, the specific depth/severity stage when documented. Avoid defaulting to unspecified codes such as L97.929 when the operative or progress note supports a more specific laterality or severity code. Etiology codes (diabetes, venous insufficiency) should always be sequenced according to ICD-10-CM sequencing guidelines and linked explicitly in the documentation to the wound requiring graft closure.
🏥 MS-DRG Considerations
When CPT 15100 is performed during an inpatient stay, the corresponding ICD-10-PCS Replacement procedure code groups to the Skin Graft MS-DRG family (573-579), with the specific DRG assignment driven by whether the patient has major complications/comorbidities (MCC), complications/comorbidities (CC), or neither, as well as the underlying principal diagnosis (burn, ulcer, or traumatic wound).² Inpatient coders must translate the CPT-based procedure into the correct ICD-10-PCS code, since CPT codes themselves do not directly drive DRG assignment. Documentation of graft size, anatomic site, and any debridement performed at a distinct depth is essential for accurate PCS code selection and appropriate DRG weighting.
🔧 ICD-10-PCS Equivalents
| PCS Code | Full Description | Modality |
|---|---|---|
| 0HR5X7Z | Replacement of skin, chest, with autologous tissue substitute, external approach | Autograft |
| 0HR6X7Z | Replacement of skin, back, with autologous tissue substitute, external approach | Autograft |
| 0HRCX7Z | Replacement of skin, right upper arm, with autologous tissue substitute, external approach | Autograft |
| 0HRLX7Z | Replacement of skin, right upper leg, with autologous tissue substitute, external approach | Autograft |
PCS Character Analysis
| Position | Character | Value | Definition |
|---|---|---|---|
| 1 | Section | 0 | Medical and Surgical section, covering the vast majority of operating room procedures. |
| 2 | Body System | H | Skin and Breast body system, encompassing all integumentary structures. |
| 3 | Root Operation | R | Replacement — physically replacing a body part with autologous, synthetic, or nonautologous tissue. |
| 4 | Body Part | Varies | Specifies the exact anatomic site of the recipient graft (chest, back, arm, or leg segment). |
| 5 | Approach | X | External approach, since the skin surface is accessed directly without an internal cavity. |
| 6 | Device | 7 | Autologous Tissue Substitute, reflecting the use of the patient’s own harvested skin. |
| 7 | Qualifier | Z | No qualifier, as no additional qualifying detail applies to this replacement procedure. |
Root Operation Comparison
Replacement (R) is distinguished from Supplement (U) because Replacement removes and physically replaces the entire thickness of tissue being treated, whereas Supplement reinforces or augments existing tissue without full replacement. Skin substitute grafts coded under 15271-15278 are also typically coded to Replacement in ICD-10-PCS but use device values J (Synthetic Substitute) or K (Nonautologous Tissue Substitute) rather than 7 (Autologous Tissue Substitute).
📝 Coding Examples
Example 1
Clinical Scenario: A 45-year-old male sustains a third-degree burn to the anterior trunk covering approximately 90 sq cm after a workplace accident. Following adequate wound bed preparation and stabilization over the prior week, the surgeon harvests a split-thickness autograft from the patient’s thigh and applies it to the trunk wound as a meshed graft. The graft is secured with staples and a bolster dressing is applied. No additional grafting is required since the total area is under 100 sq cm. The patient tolerates the procedure well and is scheduled for routine postoperative wound checks.
| Field | Code | Rationale |
|---|---|---|
| CPT | 15100 | Reports the split-thickness autograft to the trunk for a wound area of 90 sq cm, which falls within the first-100-sq-cm threshold of the base code. |
| PDx | T21.31XA | Documents the third-degree trunk burn as the underlying condition necessitating graft closure, coded to the initial encounter. |
Note
Because the total graft area is under 100 sq cm, the add-on code 15101 is not reported; billing it in this scenario would constitute an inappropriate unbundling of services.
Example 2
Clinical Scenario: A 62-year-old diabetic woman has a chronic left lower leg ulcer that has failed four weeks of conservative wound care. The surgeon first performs excisional debridement of necrotic tissue at the wound base, then applies a split-thickness autograft harvested from the same leg to close the 80 sq cm defect. Both the debridement and graft application are clearly documented as distinct steps with separate operative time. The patient’s diabetes is documented as contributing to poor wound healing.
| Field | Code | Rationale |
|---|---|---|
| CPT 1 | 15002 | Reports the separately identifiable surgical preparation of the recipient site by excision of necrotic tissue prior to graft placement. |
| CPT 2 | 15100 | Reports the split-thickness autograft application covering the 80 sq cm leg wound after adequate preparation. |
| PDx | E11.622 | Documents the underlying type 2 diabetes with skin ulcer as the etiologic driver requiring graft closure. |
Warning
Example 3
Clinical Scenario: A 30-year-old patient with symmetric traumatic degloving injuries to both forearms undergoes bilateral split-thickness autografting in a single operative session, each recipient site measuring approximately 95 sq cm. The surgeon harvests donor skin from the bilateral thighs and applies meshed grafts to both forearm wounds. Documentation clearly specifies bilateral, symmetric anatomic sites and equivalent graft sizes.
| Field | Code | Rationale |
|---|---|---|
| CPT | 15100-50 | Reports the bilateral autograft application to symmetric forearm sites using modifier -50, triggering the 150% bilateral payment adjustment rather than duplicate line reporting. |
| PDx | S71.101A | Documents the traumatic open wound as the primary indication for graft closure at the initial encounter. |
Global period reminder
All routine postoperative visits related to graft healing on both arms are bundled into the single 90-day global period established by the bilateral 15100 claim; separate E/M billing for routine wound checks during this window would be inappropriate without modifier -24 or -79 to document unrelated care.
⚠️ Common Coding Pitfalls
- Confusing anatomic site codes — Reporting 15100 (trunk/arms/legs) when the operative note documents a specialized site such as the hand or face, which should instead be coded to 15120; anatomic site documentation must be reviewed carefully before code selection.
- Missing graft area documentation — Failing to confirm the exact recipient wound size in square centimeters, which is required to correctly determine whether the add-on code 15101 applies for area beyond the first 100 sq cm.
- Inappropriate bundling of debridement — Reporting surgical preparation codes (15002) without clear operative documentation distinguishing true excisional debridement from simple graft-bed cleansing already included in 15100.
- Duplicate bilateral reporting — Reporting 15100 twice with -RT and -LT modifiers instead of once with modifier -50 for symmetric bilateral grafting, which misapplies the bilateral payment methodology.
- Unbundling global period services — Separately billing routine postoperative wound checks or dressing changes performed within the 90-day global period without an appropriate modifier to indicate unrelated or staged care.
- Confusing autograft with skin substitute coding — Mistakenly applying skin substitute graft codes (15271-15278) or their associated LCD coverage criteria to an autograft procedure, when 15100 uses the patient’s own tissue and is governed by standard medical necessity criteria rather than skin-substitute-specific coverage policy.⁴
¹ American Medical Association, CPT 2026 Professional Edition, Surgery — Integumentary System, code 15100. ² Centers for Medicare & Medicaid Services, MS-DRG Definitions Manual, Skin Graft MS-DRGs 573-579, FY2026. ³ Centers for Medicare & Medicaid Services, National Physician Fee Schedule Relative Value File and Global Surgery Indicator descriptions, 2026. ⁴ Centers for Medicare & Medicaid Services, Local Coverage Determination L35041, Application of Bioengineered Skin Substitutes to Lower Extremity Chronic Non-Healing Wounds (applies to skin substitute grafts, not autografts; no dedicated NCD/LCD restricts autograft CPT 15100 itself as of 2026). ⁵ AAPC, “Surgical Preps: When Do You Code Them?” coding guidance on separate reportability of 15002-15005 with skin replacement codes. ⁶ ICD10Data.com, 2026 ICD-10-CM code lookup and specificity guidance.
Sources listed above correspond to superscript citations throughout this note. Verify all Medicare payment figures against your current CMS PFS Lookup tool and applicable MAC LCD prior to claim submission. Please use the latest AAPC/AHIMA Coding Books to verify each code within this note.