Crystal's Coder Hub✂️ CPT 11400 — Excision, Benign Lesion; Trunk/Arms/Legs, Excised Diameter 0.5 cm or Less
Quick Reference
wRVU: 0.80 | Global Period: 010 (10 Days) | Assistant Payable: ❌ No | Bilateral Indicator: 3
📋 Clinical Description
CPT 11400 describes the full-thickness excision of a single benign skin lesion — including margins — located on the trunk, arms, or legs, with an excised diameter of 0.5 cm or less, including simple closure when performed. Unlike the shave removal family (11300-11303), which uses a tangential technique confined to the epidermis and dermis, excision codes describe a full-thickness incision through the dermis into the subcutaneous tissue, resulting in a wound defect that typically requires repair. The excised diameter includes the lesion plus any margins taken and is measured as the greatest single diameter of the excised specimen — not the lesion alone. When simple linear closure is performed, it is bundled into 11400; when an intermediate or complex repair is required, those repair codes are separately reportable.
Benign skin lesions requiring full-thickness removal — including melanocytic nevi with atypical features, epidermal and sebaceous cysts, dermatofibromas, lipomas (when superficial), and benign tumors of the dermis — are the primary indications for CPT 11400. The full-thickness excision technique is selected over shave removal when complete removal of the lesion including its base and margins is clinically necessary — for example, when the lesion has atypical clinical features requiring margin evaluation, when recurrence after shave is anticipated, when the lesion extends deep into the dermis or subcutaneous fat, or when the clinical differential includes malignancy and complete histopathologic evaluation with margins is required. When the clinical impression or pathology confirms malignancy, the appropriate code family is 11600-11646 (excision, malignant lesion), not the 11400 series.
This procedure may be performed in the following clinical contexts:
- Atypical Melanocytic Nevus — Full Excision with Margins — Excision of a clinically atypical or mildly dysplastic-appearing nevus on the trunk or extremity requiring margin evaluation; shave technique is insufficient when Breslow depth assessment or margin status is clinically necessary
- Epidermal or Sebaceous Cyst — Complete Excision with Cyst Wall — Full-thickness excision of a cyst including the intact cyst wall to prevent recurrence; shave removal does not allow removal of the cyst wall, making recurrence highly likely
- Dermatofibroma — Deep Excision — Excision of a firm intradermal fibrous nodule extending into the deep dermis or superficial subcutaneous tissue; these lesions are poorly defined at depth and are not adequately addressed by shave technique
- Recurrent or Previously Incompletely Excised Benign Lesion — Re-excision of a benign lesion with previously positive or close margins; modifier -58 applies if within the 10-day global window of the original procedure
- Benign Lesion with Uncertain Clinical Impression Requiring Margin Assessment — When the provider cannot exclude malignancy based on clinical examination alone and elects full-thickness excision with margins for complete pathologic evaluation; the code is assigned at the time of excision based on clinical impression; if pathology returns malignant, recoding may be required per payer policy
🔬 Anatomical & Procedural Considerations
| Technique Variant | Mechanism / Steps | Key Notes |
|---|---|---|
| Standard Elliptical Excision | Elliptical incision around the lesion with margins; full-thickness cut through dermis to subcutaneous fat; specimen removed en bloc; linear closure | Most common technique; the ellipse length is typically 3× the width; document margins taken and orientation of specimen for pathology |
| Punch Excision | Circular punch tool (4-8 mm) used for full-thickness removal of small round lesions; simple closure with 1-2 interrupted sutures | Appropriate for small round lesions ≤0.5 cm; creates a full-thickness defect distinguishable from punch biopsy by primary intent (removal vs. sampling) |
| Fusiform / Lenticular Excision | Variant of elliptical excision designed to minimize dog-ear deformity; appropriate for extremity lesions where skin tension lines must be respected | Document the excision axis relative to relaxed skin tension lines; particularly important for arm and leg lesions |
| Excision with Undermining | Wound edges undermined at the subcutaneous level to facilitate tension-free primary closure | Undermining is included in the excision and simple repair — not separately reportable unless the closure escalates to intermediate or complex repair criteria |
Clinical Pearl
The excised diameter — used to select the correct tier within the 11400-11406 series — is measured as the greatest single diameter of the entire excised specimen including margins, not the lesion diameter alone. For example, if a 0.3 cm lesion is excised with 1 mm margins on each side, the excised diameter is approximately 0.5 cm — placing this in the 11400 tier (≤0.5 cm). If the same lesion is excised with 3 mm margins, the excised diameter is approximately 0.9 cm — escalating to 11401 (0.6-1.0 cm tier). The operative note must document the excised diameter (the specimen measurement including margins), not just the lesion diameter, to support the tier selected. This is the single most audited documentation element in the benign excision code family.
✅ Procedure Includes…
- Pre-procedure clinical assessment of the lesion including site, morphology, clinical impression, and measured excised diameter
- Local anesthesia — topical or injectable (bundled into 11400; not separately reportable)
- Full-thickness incision through dermis into subcutaneous tissue with margins
- En bloc removal of the lesion with surrounding margin tissue
- Hemostasis
- Simple linear closure (single-layer closure — bundled; intermediate or complex closure is separately reportable)
- Specimen labeling, orientation marking, and submission to pathology (pathology interpretation separately reportable under 88302-88309)
❌ Excludes / Do Not Report Together
| Code | Description | Relationship to 11400 |
|---|---|---|
| 11401 | Excision, benign lesion; trunk/arms/legs; excised diameter 0.6-1.0 cm | Same site family, next size tier; select based on excised diameter including margins — never report 11400 and 11401 for the same lesion |
| 11402 | Excision, benign lesion; trunk/arms/legs; excised diameter 1.1-2.0 cm | Larger tier; same site family |
| 11403 | Excision, benign lesion; trunk/arms/legs; excised diameter 2.1-3.0 cm | Larger tier; same site family |
| 11404 | Excision, benign lesion; trunk/arms/legs; excised diameter 3.1-4.0 cm | Larger tier |
| 11406 | Excision, benign lesion; trunk/arms/legs; excised diameter over 4.0 cm | Largest tier; same site family |
| 11420 | Excision, benign lesion; scalp/neck/hands/feet/genitalia; 0.5 cm or less | Anatomically distinct — same technique but different site family; do not use 11400 for lesions on the scalp, neck, hands, feet, or genitalia |
| 11440 | Excision, benign lesion; face/ears/eyelids/nose/lips/mucous membrane; 0.5 cm or less | Anatomically distinct — face and facial structures; do not use 11400 for facial lesions |
| 11600 | Excision, malignant lesion; trunk/arms/legs; excised diameter 0.5 cm or less | When pathology confirms malignancy, recoding to the 116xx malignant excision family is required per payer policy; 11400 and 11600 are mutually exclusive for the same lesion |
| 11300 | Shave removal, trunk/arms/legs; 0.5 cm or less | Shave removal and excision are mutually exclusive by technique for the same lesion — shave stays within epidermis/dermis; excision is full-thickness; never report both for the same lesion |
| 12001-12021 | Simple repair of superficial wounds | Simple linear closure is bundled into 11400 — do not report a repair code for simple closure of the excision defect; only intermediate (12031-12057) or complex (13100-13160) repair is separately reportable when documented criteria are met |
| E/M codes (992xx / 920xx) | Office visit, any level | Separately reportable only when modifier -25 is appended to the E/M code, documenting a significant, separately identifiable E/M service beyond the routine pre-procedure lesion assessment |
Bundling Alert — Global Period is 010 (10 Days)
CPT 11400 carries a 010 global period (10 days) — this is a critical distinction from the shave removal family (11300-11313) and biopsy (11100), which both carry 000 global periods. The 10-day global means that all related pre- and post-procedure services, including follow-up wound checks and suture removal within 10 days of the procedure, are bundled into the 11400 payment and cannot be separately billed. If a patient returns within the 10-day global window for a condition unrelated to the excision, modifier -24 is appended to the E/M with explicit documentation of the unrelated nature. For a planned staged procedure within the global window, modifier -58 applies. An unplanned return to the OR for a complication within the global period requires modifier -78.
🌳 Code Tree — Surgery: Skin, Subcutaneous and Accessory Structures
CPT 11400-11471 Excision — Benign Lesion
│
├── 11400-11406 Trunk, Arms, or Legs
│ ├── ▶▶ 11400 ◀◀ Excised diameter 0.5 cm or less ← YOU ARE HERE (Global: 010)
│ ├── 11401 Excised diameter 0.6-1.0 cm (Global: 010)
│ ├── 11402 Excised diameter 1.1-2.0 cm (Global: 010)
│ ├── 11403 Excised diameter 2.1-3.0 cm (Global: 010)
│ ├── 11404 Excised diameter 3.1-4.0 cm (Global: 010)
│ └── 11406 Excised diameter over 4.0 cm (Global: 010)
│
├── 11420-11426 Scalp, Neck, Hands, Feet, or Genitalia
│ ├── 11420 Excised diameter 0.5 cm or less (Global: 010)
│ ├── 11421 Excised diameter 0.6-1.0 cm (Global: 010)
│ ├── 11422 Excised diameter 1.1-2.0 cm (Global: 010)
│ ├── 11423 Excised diameter 2.1-3.0 cm (Global: 010)
│ ├── 11424 Excised diameter 3.1-4.0 cm (Global: 010)
│ └── 11426 Excised diameter over 4.0 cm (Global: 010)
│
└── 11440-11446 Face, Ears, Eyelids, Nose, Lips, or Mucous Membrane
├── 11440 Excised diameter 0.5 cm or less (Global: 010)
├── 11441 Excised diameter 0.6-1.0 cm (Global: 010)
├── 11442 Excised diameter 1.1-2.0 cm (Global: 010)
├── 11443 Excised diameter 2.1-3.0 cm (Global: 010)
├── 11444 Excised diameter 3.1-4.0 cm (Global: 010)
└── 11446 Excised diameter over 4.0 cm (Global: 010)
💰 RVU & Reimbursement Profile
| Component | Value |
|---|---|
| Work RVU (wRVU) | 0.80 (verify against current CMS MPFS for applicable year) |
| Global Period | 010 (10 Days) |
| Bilateral Indicator | 3 — Bilateral surgery concept does not apply; no bilateral reduction applied |
| Assistant Surgeon | ❌ Not payable |
| Co-Surgeon | ❌ Not applicable |
| Team Surgery | ❌ Not applicable |
| PC/TC Split | ❌ No — Procedure code only (Indicator 0) |
| Modifier -51 Exempt | No — subject to multiple procedure reduction rules |
| Anesthesia | Local anesthesia — bundled; not separately reportable; general anesthesia separately billable only in rare instances when medically documented |
Multiple Lesion Billing Rules
Like the shave removal family, the benign excision family has no add-on code. Each benign lesion excised is its own separate primary code line, selected based on the individual lesion’s site and excised diameter. When multiple excisions are performed in the same session, each code after the highest-valued procedure is subject to the multiple procedure payment reduction under modifier -51. Document each lesion individually with its own site, excised diameter, clinical impression, and technique. When lesions span different site families (e.g., one on the trunk billed as 11400 and one on the scalp billed as 11420), each code is independently selected from its respective site family.
🏷️ Modifier Reference
| Modifier | Name | When to Apply |
|---|---|---|
| -25 | Significant, Separately Identifiable E/M | Applied to the E/M code — not 11400 — when a separately identifiable office visit is performed on the same date; documentation must support a distinct evaluation with history, exam, and MDM beyond the pre-procedure lesion assessment |
| -24 | Unrelated E/M During Postoperative Period | Applied to the E/M code when a patient returns within the 10-day global window for a condition unrelated to the excision; document the unrelated nature explicitly in the visit note |
| -51 | Multiple Procedures | When 11400 is performed alongside other surgical procedures in the same session; apply to the lower-valued code; each additional benign excision is a separate primary code subject to -51 |
| -52 | Reduced Services | Procedure partially completed; document clinical reason |
| -53 | Discontinued Procedure | Procedure stopped after initiation due to patient safety concern; document thoroughly |
| -58 | Staged or Related Procedure | When a re-excision or related staged procedure is planned and performed within the 10-day global window; must be documented as planned at the time of the initial procedure |
| -78 | Unplanned Return to OR | Unplanned return to the operating room for a complication (e.g., hematoma, wound dehiscence) during the 10-day global period |
| -79 | Unrelated Procedure During Postoperative Period | Unrelated surgical procedure performed during the 10-day global window; document unrelated nature |
| -59 | Distinct Procedural Service | When 11400 is reported alongside another procedure that a payer inappropriately bundles; documents distinct lesion site or independent service |
| -XS | Separate Structure | Preferred X-modifier over -59 when billing 11400 for an anatomically distinct site from another same-day procedure |
| -XU | Unusual Non-Overlapping Service | When a payer inappropriately bundles 11400 with a clearly distinct, non-overlapping service |
🩺 Common ICD-10-CM Pairings
Melanocytic Nevi — Trunk and Extremities
| ICD-10 Code | Description | HCC? | Clinical Notes |
|---|---|---|---|
| D22.5 | Melanocytic nevi of trunk | ❌ No | Benign nevus on the trunk; most specific site code for trunk lesions; assign when provider documents benign clinical impression |
| D22.61 | Melanocytic nevi of right upper limb, including shoulder | ❌ No | Right arm/shoulder nevus; laterality required; assign site-specific code over D22.9 when side is documented |
| D22.62 | Melanocytic nevi of left upper limb, including shoulder | ❌ No | Left arm/shoulder nevus |
| D22.71 | Melanocytic nevi of right lower limb, including hip | ❌ No | Right leg/hip nevus |
| D22.72 | Melanocytic nevi of left lower limb, including hip | ❌ No | Left leg/hip nevus |
| D22.9 | Melanocytic nevi, unspecified | ❌ No | Use only when site is not documented; query provider for specificity before defaulting to unspecified |
Benign Neoplasms and Cysts
| ICD-10 Code | Description | HCC? | Clinical Notes |
|---|---|---|---|
| D23.5 | Other benign neoplasm of skin of trunk | ❌ No | Benign non-nevus lesion on trunk; use when clinical impression is benign but diagnosis is not further specified in documentation |
| D23.61 | Other benign neoplasm of skin of right upper limb | ❌ No | Benign dermal lesion, right arm; assign lateralized code when documented |
| L72.0 | Epidermal cyst | ❌ No | Epidermal inclusion cyst requiring full excision including cyst wall; very common indication for 11400; document “cyst wall removed intact” in operative note to support complete excision |
| L72.3 | Sebaceous cyst | ❌ No | Sebaceous gland cyst; similar coding rationale to L72.0; document complete cyst wall removal |
| L91.0 | Hypertrophic scar | ❌ No | Raised scar tissue excised for symptomatic or functional reasons; cosmetic indication alone may not meet medical necessity criteria |
| L91.8 | Other hypertrophic disorders of the skin | ❌ No | Dermatofibroma or other intradermal hypertrophic lesion |
Uncertain or Pre-Pathology Diagnosis
| ICD-10 Code | Description | HCC? | Clinical Notes |
|---|---|---|---|
| D48.5 | Neoplasm of uncertain behavior of skin | ❌ No | Use at time of excision when clinical impression is uncertain and pathology is pending; do not assign a confirmed malignancy code before pathology results are available |
| Z85.828 | Personal history of other malignant neoplasm of skin | ❌ No | Prior skin malignancy history supporting medical necessity for surveillance excision; assign as additional diagnosis |
| Z12.83 | Encounter for screening for malignant neoplasm of skin | ❌ No | Screening encounter in asymptomatic patient; when a specific lesion drives the visit, the lesion code is the principal diagnosis |
Coding Specificity Reminder
The most common specificity gaps for 11400 ICD-10-CM pairings are (1) failing to assign lateralized D22.- or D23.- codes when the operative note documents right vs. left extremity, and (2) assigning a confirmed malignancy code (C44.-) before pathology results are available. At the time of excision, if the clinical impression is benign, code to the benign diagnosis (D22.-, D23.-) or uncertain behavior (D48.5). If pathology subsequently returns malignant, the diagnosis is updated at the follow-up visit when results are reviewed and documented. ICD-10-CM specificity requirements are not optional — use the operative note’s documented site and clinical impression to drive the most specific code selection available.
🏥 MS-DRG Considerations (Inpatient)
Inpatient Coding Reminder
CPT 11400 is performed exclusively in the outpatient, office, or ASC setting. There are no routine MS-DRG assignments for this procedure — inpatient admission for benign lesion excision would not be supported by any payer, MAC, or utilization review body. If a patient undergoing an inpatient admission for an unrelated diagnosis also has a benign skin lesion excised, an ICD-10-PCS Excision code under Body System H (Skin and Breast) with qualifier Z (No Qualifier) is assigned for completeness; however, this will have no independent impact on DRG grouping in isolation. See the ICD-10-PCS section below.
🔧 ICD-10-PCS Equivalents (Inpatient Facility Coding)
Note
Inpatient PCS coding for benign lesion excision uses the Excision root operation (character B) under Body System H (Skin and Breast) with the External approach (X) and qualifier Z (No Qualifier) for therapeutic removal. This distinguishes therapeutic excision from diagnostic biopsy, which uses qualifier X (Diagnostic). PCS does not differentiate between benign and malignant lesion excision at the code level — both use Excision (B) with qualifier Z; the benign vs. malignant distinction is captured in the ICD-10-CM diagnosis code, not the PCS procedure code. Assign the PCS code corresponding to the documented anatomic body part per the ICD-10-PCS Body Part Key.
| PCS Code | Full Description | Site |
|---|---|---|
0HB5XZZ | Excision of Chest Skin, External Approach | Trunk — chest/anterior thorax |
0HB6XZZ | Excision of Back Skin, External Approach | Trunk — back |
0HB7XZZ | Excision of Abdomen Skin, External Approach | Trunk — abdomen |
0HBCXZZ | Excision of Right Upper Arm Skin, External Approach | Right upper arm |
0HBDXZZ | Excision of Left Upper Arm Skin, External Approach | Left upper arm |
0HBEXZZ | Excision of Right Lower Arm and Wrist Skin, External Approach | Right forearm/wrist |
0HBFXZZ | Excision of Left Lower Arm and Wrist Skin, External Approach | Left forearm/wrist |
0HBAXZZ | Excision of Right Lower Leg Skin, External Approach | Right lower leg |
0HBBXZZ | Excision of Left Lower Leg Skin, External Approach | Left lower leg |
PCS Character Analysis — 0HB6XZZ
| Position | Character | Value | Definition |
|---|---|---|---|
| 1 | Section | 0 | Medical and Surgical |
| 2 | Body System | H | Skin and Breast |
| 3 | Root Operation | B | Excision (cutting out or off, without replacement, a portion of a body part) |
| 4 | Body Part | 6 | Back Skin |
| 5 | Approach | X | External |
| 6 | Device | Z | No Device |
| 7 | Qualifier | Z | No Qualifier |
PCS Qualifier: No Qualifier (Z) vs. Diagnostic (X)
- Use qualifier Z (No Qualifier) when excision is performed for therapeutic removal of a lesion — this is the inpatient PCS equivalent of CPT 11400 (benign excision) and CPT 11600 (malignant excision); PCS does not distinguish between them at the code level
- Use qualifier X (Diagnostic) when excision is performed for diagnostic tissue sampling — this is the inpatient PCS equivalent of CPT 11100 (biopsy)
- When a lesion is completely excised and simultaneously submitted for pathology, the primary intent documented in the operative note drives qualifier selection; therapeutic excision with incidental pathology = qualifier Z
📝 Coding Examples
Example 1 — Office: Epidermal Cyst, Right Forearm, Excision with Simple Closure
Clinical Scenario: A 44-year-old male presents to his dermatologist for removal of a 0.4 cm firm, mobile subcutaneous cyst on the right forearm, consistent with an epidermal inclusion cyst. The patient reports the cyst has been growing slowly and has become tender. The provider documents: “Elliptical excision performed under local anesthesia; cyst wall removed intact; excised diameter 0.5 cm including margins; right forearm; simple linear closure with 3-0 nylon interrupted sutures; specimen submitted for pathology.” No separately documented E/M beyond lesion assessment.
| Field | Code | Rationale |
|---|---|---|
| CPT | 11400 | Excision, benign lesion; trunk/arms/legs (right forearm = arm); excised diameter 0.5 cm — within the ≤0.5 cm tier; simple closure bundled |
| PDx | L72.0 | Epidermal cyst — documented clinical impression; “cyst wall removed intact” supports complete excision documentation |
Note
Simple closure (3-0 nylon interrupted sutures) is bundled into 11400 — do not separately report a simple repair code (12001 series). The pathology interpretation is separately billable by the pathologist under 88305. The 10-day global period begins on the procedure date — suture removal within 10 days is bundled; if the patient returns for suture removal at day 10 or beyond, a separate E/M may be reportable depending on payer policy.
Example 2 — Office: Multiple Benign Excisions, Same Session, With Separate E/M
Clinical Scenario: A 56-year-old female presents for removal of two lesions: a 0.4 cm atypical-appearing nevus on the upper back and a 0.7 cm dermatofibroma on the left upper arm. A separately documented E/M is performed addressing a new complaint of an enlarging lymph node in the right axilla, with distinct history, physical examination, and MDM beyond the lesion removal assessment. Both lesions are excised by elliptical technique with simple closure and submitted for pathology.
| Field | Code | Rationale |
|---|---|---|
| CPT 1 | 99213--25 | Separately identifiable E/M for new axillary lymphadenopathy concern — modifier -25 on the E/M; distinct documentation with history, exam, and MDM |
| CPT 2 | 11400 | Excision, benign lesion; trunk (upper back); excised diameter 0.4 cm — ≤0.5 cm tier; highest wRVU procedure |
| CPT 3 | 11401--51 | Excision, benign lesion; trunk/arms/legs (left upper arm); excised diameter 0.7 cm — 0.6-1.0 cm tier; -51 applied as second procedure |
| PDx | D48.5 | Neoplasm of uncertain behavior of skin — atypical-appearing nevus, clinical impression uncertain pending pathology |
| SDx | L91.8 | Other hypertrophic disorders of the skin — dermatofibroma, left upper arm |
| SDx | R59.0 | Localized enlarged lymph nodes — right axilla; supports the separately identifiable E/M |
Warning
Modifier -25 belongs on the E/M code, never on 11400 or 11401. Each excision is its own separate primary code — there is no add-on code for additional benign excisions. Note that 11400 and 11401 are both from the trunk/arms/legs family, appropriate here since both sites (back and upper arm) fall within that group. The -51 modifier is applied to 11401 as the lower-valued procedure. Both procedures carry 010 global periods beginning on the same date of service.
Example 3 — Office: Atypical Nevus, Re-Excision Within Global Period
Clinical Scenario: A 38-year-old female underwent excision of a 0.4 cm atypical nevus on the right lower leg (CPT 11400) on April 18. Pathology returns April 22 showing moderately dysplastic nevus with positive deep margin. The provider schedules re-excision for April 25, within the 10-day global window. The April 25 procedure note documents: “Re-excision of right lower leg nevus site; excised diameter 0.8 cm including prior scar and new margins; simple closure; specimen submitted.” Clinical impression remains benign — moderately dysplastic nevus, not melanoma.
| Field | Code | Rationale |
|---|---|---|
| CPT | 11401--58 | Re-excision; excised diameter 0.8 cm — escalates to 11401 tier (0.6-1.0 cm); modifier -58 documents planned staged procedure within the 10-day global window of the April 18 procedure |
| PDx | D22.71 | Melanocytic nevi of right lower limb — moderately dysplastic nevus confirmed by pathology; remains in benign/uncertain category; if pathology had confirmed melanoma, recode to C43.- series |
Note
Global period reminder: The April 18 procedure (11400) carries a 010 global period. The April 25 re-excision falls within that 10-day window. Modifier -58 is required to signal a staged/related procedure within the global period — without it, the April 25 claim would be denied as bundled into the global. Document the staging plan in the April 18 note or in the April 22 pathology review note to support the -58 modifier. Note the code escalation from 11400 to 11401 on re-excision — this is appropriate and expected when the re-excision diameter is larger than the original.
⚠️ Common Coding Pitfalls
-
Measuring Lesion Diameter Instead of Excised Diameter: The tier-determining measurement for 11400 is the excised diameter including margins — not the lesion diameter alone. A 0.3 cm lesion excised with standard margins may have an excised diameter of 0.7 cm, pushing the code to 11401. Conversely, coding 11401 when the operative note only documents a “0.4 cm lesion” without margin measurement is unsupported. The procedure note must document the excised specimen diameter — this is the most audited element in the 11400 family.
-
Separately Reporting Simple Closure: Simple linear repair of an excision defect is bundled into 11400 by CPT convention. Appending a simple repair code (12001 series) for the same wound on the same date is an NCCI bundling violation and among the most common dermatology billing errors. Only intermediate (12031-12057) or complex (13100-13160) repair is separately reportable when the closure criteria for those codes are genuinely met and documented.
-
Using 11400 Instead of 11420 or 11440 for Wrong Anatomic Sites: CPT 11400 applies only to the trunk, arms, and legs. Scalp, neck, hand, foot, and genital lesions belong in the 11420 series; face, ear, eyelid, nose, lip, and mucous membrane lesions belong in the 11440 series. Defaulting to 11400 for all benign excisions regardless of site is a site-specificity error that payers can identify through operative note review.
-
Failing to Apply Modifier -24 for Unrelated E/M Within the 10-Day Global Window: Unlike the shave removal and biopsy families (which have 000 global periods), 11400 carries a 010 global period. If a patient returns within 10 days for any reason, the provider must determine whether the visit is related or unrelated to the excision. Related follow-up (wound check, suture removal) is bundled — not separately billable. An unrelated E/M requires modifier -24 with explicit documentation of the unrelated nature; omitting -24 will result in claim denial.
-
Assigning a Malignant Diagnosis Code at Time of Excision Before Pathology: When the clinical impression at time of excision is benign, code to the benign diagnosis (D22.-, D23.-) or uncertain behavior (D48.5). Assigning C44.- (malignant) or C43.- (melanoma) codes on the excision date without pathology confirmation is a diagnosis coding violation. If pathology subsequently confirms malignancy, the diagnosis is updated at the follow-up visit and the excision code may need to be amended to the 11600 series per payer recoding policy.
-
Confusing the 010 Global Period with the Shave Removal 000 Global Period: Providers and coders who regularly bill shave removals (000 global) may incorrectly apply the same same-day-only global logic to 11400. The 10-day global for 11400 means follow-up wound checks, dressing changes, and suture removal within 10 days are all bundled — failing to track this window creates overpayment liability when those visits are billed separately without the appropriate modifier.
📎 Sources
1. AMA CPT 2025 Professional Edition — Codes 11400-11406, Excision of Benign Lesion, Trunk/Arms/Legs · 2. CMS 2025 Medicare Physician Fee Schedule Final Rule (CMS-1807-F) — RVU and Global Period Assignments · 3. CMS RVU25A Relative Value Files — Work RVU: 0.80, Global Period: 010, Bilateral Indicator: 3 · 4. NCCI Policy Manual Chapter 1 & Chapter 4 (Integumentary System), CMS 2024-2025 — Benign Excision Bundling Rules, Simple Repair Bundling, Mutually Exclusive Code Edits · 5. ICD-10-CM Official Guidelines for Coding and Reporting FY2025 — Section I.C.2 (Neoplasms), Section I.C.12 (Skin and Subcutaneous Tissue), Section IV.H (Uncertain Diagnosis — Outpatient) · 6. ICD-10-PCS Official Guidelines for Coding and Reporting FY2025 — Root Operation Excision (B), Qualifier Z (No Qualifier) vs. X (Diagnostic), Body System H (Skin and Breast), External Approach · 7. AAPC Dermatology Coding Guidelines — Benign vs. Malignant Excision Code Selection; Excised Diameter Measurement Standards; Global Period Rules for 010 Codes · 8. CMS Medicare Coverage Database — Billing and Coding: Skin Lesion Excision and Repair · 9. Palmetto GBA Jurisdiction M — Skin Lesion Excision Policy and Medical Necessity Documentation Requirements · 10. ICD-10-CM FY2025 Tabular List — Chapter 2 (D22 Melanocytic Nevi, D23 Benign Neoplasms, D48.5 Uncertain Behavior), Chapter 12 (L72 Follicular Cysts, L91 Hypertrophic Disorders)