Summary & Overview
CPT 11601: Excision of Malignant Skin Lesion, 0.5 cm or Less
CPT code 11601 represents the surgical excision of a malignant skin lesion, including margins, on the trunk, arms, or legs, with a diameter of 0.5 cm or less. This code is significant in dermatology and surgical practice, as it addresses the removal of early-stage skin cancers and ensures appropriate clinical documentation for reimbursement. The procedure is commonly performed in both hospital and office settings, reflecting its versatility in patient care.
Major national payers, including Aetna, Blue Cross Blue Shield, Cigna Health, Medicare, and UnitedHealthcare, recognize and reimburse for CPT code 11601, making it a widely accepted standard for reporting small malignant skin lesion excisions. Readers will gain insight into payer coverage, clinical benchmarks, and policy updates relevant to this code. The publication also provides context on associated modifiers, relevant provider taxonomies, and ICD-10 diagnoses linked to melanoma in situ and other malignant skin conditions. Additionally, related CPT codes for excision of larger or differently located lesions are outlined, offering a comprehensive view of coding options for malignant skin excisions.
This summary equips healthcare professionals, billing specialists, and policy analysts with the essential information needed to understand the clinical and administrative significance of CPT code 11601 in the broader landscape of skin cancer management and medical billing.
CPT Code Overview
CPT code 11601 is used to report the excision of a malignant skin lesion, including margins, on the trunk, arms, or legs, where the diameter of the lesion is 0.5 cm or less. This procedure is classified as a surgical intervention within the integumentary system and is performed to remove cancerous tissue, ensuring clear margins to reduce the risk of recurrence. The service may be provided in both facility settings, such as hospitals, and non-facility settings, including physician offices, depending on clinical circumstances and patient needs.
Clinical & Coding Specifications
Clinical Context
A patient presents to a dermatology clinic with a suspicious skin lesion on the trunk, arm, or leg. The lesion is clinically diagnosed as malignant, such as melanoma in situ, and measures 0.5 cm or less in diameter. After evaluation, the provider determines that excision is necessary to remove the lesion, including appropriate margins to ensure complete removal. The procedure is performed in either an office or hospital setting, depending on patient needs and provider practice. The excised tissue is sent for pathological analysis to confirm diagnosis and margin status. Documentation includes lesion size, location, and pathology findings.
Coding Specifications
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Modifier
59: Distinct Procedural Service. Used when a procedure or service is distinct or independent from other services performed on the same day, such as excising multiple lesions at different anatomical sites. -
Modifier
51: Multiple Procedures. Used when more than one procedure is performed during the same session, such as excision of multiple lesions.
| Modifier Code | Description |
|---|---|
59 | Distinct Procedural Service |
51 | Multiple Procedures |
- Provider Taxonomies:
| Taxonomy Code | Specialty Name |
|---|---|
207N00000X | Dermatology Physician |
207ND0101X | MOHS-Micrographic Surgery Physician |
208600000X | Surgery Physician |
These taxonomies represent providers specializing in dermatology, MOHS surgery, and general surgery, all of whom may perform excision of malignant skin lesions.
Related Diagnoses
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D03.0: Melanoma in situ of lip- Relevant when the excised lesion is located on the lip and diagnosed as melanoma in situ.
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D03.11: Melanoma in situ of right ear and external auricular canal- Used for lesions on the right ear or external canal.
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D03.12: Melanoma in situ of left ear and external auricular canal- Used for lesions on the left ear or external canal.
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D03.21: Melanoma in situ of other and unspecified parts of face- Applied when the lesion is on other or unspecified facial areas.
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D03.22: Melanoma in situ of unspecified part of face- Used for lesions on unspecified facial sites.
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D03.39: Melanoma in situ of other part of trunk- Relevant for lesions on the trunk, matching the anatomical sites for
11601.
- Relevant for lesions on the trunk, matching the anatomical sites for
-
D03.51: Melanoma in situ of right upper limb, including shoulder- Used for lesions on the right arm or shoulder.
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D03.52: Melanoma in situ of left upper limb, including shoulder- Used for lesions on the left arm or shoulder.
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D03.59: Melanoma in situ of unspecified upper limb- Used when the specific upper limb is not documented.
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D03.61: Melanoma in situ of right lower limb, including hip- Used for lesions on the right leg or hip.
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D03.62: Melanoma in situ of left lower limb, including hip- Used for lesions on the left leg or hip.
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D03.71: Melanoma in situ of other part of lower limb- Used for lesions on other parts of the lower limb.
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D03.72: Melanoma in situ of unspecified lower limb- Used when the specific lower limb is not documented.
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D03.8: Melanoma in situ of overlapping sites of skin- Used when the lesion involves overlapping skin sites.
Each diagnosis code is clinically relevant for documenting the anatomical location and type of malignant lesion excised with 11601.
Related CPT Codes
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11600: Excision, malignant lesion including margins, trunk, arms, or legs; diameter 0.5 cm or less. Closely related to11601, often used for lesions of the same size but may differ in clinical documentation or payer requirements. -
11602: Excision, malignant lesion including margins, trunk, arms, or legs; diameter 1.1 to 2.0 cm. Used for larger lesions on the same anatomical sites. -
11603: Excision, malignant lesion including margins, trunk, arms, or legs; diameter 2.1 to 3.0 cm. Used for even larger lesions. -
11604: Excision, malignant lesion including margins, trunk, arms, or legs; diameter 3.1 to 4.0 cm. Used for lesions of this size range. -
11606: Excision, malignant lesion including margins, trunk, arms, or legs; diameter over 4.0 cm. Used for the largest lesions on these sites. -
11640: Excision, malignant lesion including margins, face, ears, eyelids, nose, lips; diameter 0.5 cm or less. Used for similar procedures on facial and special sites. -
11641: Excision, malignant lesion including margins, face, ears, eyelids, nose, lips; diameter 1.1 to 2.0 cm. Used for larger lesions on these sites. -
11642: Excision, malignant lesion including margins, face, ears, eyelids, nose, lips; diameter 2.1 to 3.0 cm. Used for even larger lesions on these sites. -
11643: Excision, malignant lesion including margins, face, ears, eyelids, nose, lips; diameter 3.1 to 4.0 cm. Used for lesions of this size range on these sites. -
11644: Excision, malignant lesion including margins, face, ears, eyelids, nose, lips; diameter over 4.0 cm. Used for the largest lesions on these sites. -
11646: Excision, malignant lesion including margins, face, ears, eyelids, nose, lips; diameter over 4.0 cm. Used for extensive excisions on these sites.
These codes are used in clinical workflows to document excision of malignant lesions based on size and anatomical location. Codes for the trunk, arms, or legs (11600-11606) are alternatives or used together for multiple lesions. Codes for the face and special sites (11640-11646) are used when lesions are located on those areas.
National Reimbursement Benchmarks
For CPT code 11601, the national mean rate for Medicare is $235.09, while the BUCA (average commercial) mean rate is $241.01. Commercial payers such as UnitedHealth Group and Cigna report higher mean rates, at $338.19 and $307.93 respectively, compared to both Medicare and BUCA. Blue Cross Blue Shield and Aetna have lower mean rates among commercial payers, at $227.31 and $171.14.
Rate dispersion, measured as the difference between the 75th and 25th percentiles, varies significantly across payers. Medicare shows the tightest range at $24.00, indicating relatively consistent rates nationally. In contrast, UnitedHealth Group exhibits the widest dispersion at $202.33, followed by Cigna at $180.50, reflecting greater variability in commercial reimbursement rates. Aetna and Blue Cross Blue Shield have moderate ranges of $79.33 and $103.71, respectively.
The table and chart below present a detailed breakdown of national benchmarks for CPT code 11601 across all major payers.
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