Summary & Overview

CPT 11640: Excision of Malignant Skin Lesion, Face 0.5 cm or Less

CPT code 11640 defines the surgical excision of a malignant skin lesion 0.5 cm or less in diameter from cosmetically and functionally sensitive facial sites such as the face, ears, eyelids, nose, and lips. This code matters nationally because skin cancer procedures on the face carry distinct clinical and reimbursement considerations tied to lesion size, anatomic site, and the need to preserve form and function. Payors commonly encountered in coverage and payment discussions include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

This publication provides a concise briefing on clinical context and coding scope for 11640, national payer coverage patterns, and practical benchmarking and billing considerations relevant to surgical excisions of small malignant facial lesions. Readers will find: an explanation of the procedure and typical settings of care; common payer coverage themes and reimbursement drivers; and operational notes useful for coding accuracy and claim submission. Data not available in the input will be identified where applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare11640CPTskin-excisioncutaneous-malignancysurgical-proceduredermatologic-surgeryfacial-lesionprocedure-coding

Billing Code Overview

CPT code 11640 describes the excision of a malignant skin lesion, including margins, measuring 0.5 cm or less in diameter. The procedure is performed by a qualified provider to remove a cancerous lesion from areas where cosmesis and function are critical.

Service type: Surgical excision of malignant skin lesion
Typical site of service: Skin of the face, ears, eyelids, nose, or lips

Clinical & Coding Specifications

Clinical Context

A typical patient is an adult presenting to a dermatology or general surgery clinic with a biopsy-confirmed cutaneous malignant lesion located on a cosmetically sensitive facial area (face, ear, eyelid, nose, or lip). The lesion measures 0.5 cm or less in greatest diameter including margins. Clinical workflow: evaluation and review of biopsy results, informed consent discussion addressing excision technique, anticipated margins, possible reconstruction, and risks. Pre-procedure documentation includes lesion location, size, laterality (LT/RT), pertinent medical history (anticoagulation, diabetes), and photos or diagram. On the day of service the provider performs local anesthetic infiltration, surgical excision of the lesion with margins appropriate for the histology, hemostasis, and primary closure or simple reconstruction. Specimen is labeled and sent to pathology. Post-procedure documentation includes operative note with exact measurements of lesion and margins, technique, anesthesia used, whether a pathology report will follow, and any applicable modifier use such as 26 for professional component if pathology review is billed separately or 50/RT/LT for laterality. Typical sites of service: outpatient dermatology clinic, ambulatory surgical center, or hospital outpatient department. Typical service type: minor surgical excision of malignant skin lesion on the face with specimen submission for pathology.

Coding Specifications

Modifier

Taxonomy Code	Specialty	Notes
207Y00000X	Dermatology	Dermatologists commonly perform excisions of malignant skin lesions on the face.
208000000X	General Surgery	General surgeons in outpatient settings perform cutaneous excisions and reconstructions.
2084P0800X	Otolaryngology	Otolaryngologists manage lesions on nose, ear, and perioral regions with specialized reconstruction.
207P00000X	Plastic Surgery	Plastic surgeons perform excisions with complex closures and aesthetic reconstructions.
363L00000X	Dermatopathology	Dermatopathologists interpret submitted specimens; relevant when pathology component billed separately.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`C44.311`	Basal cell carcinoma of skin of right lip, vermillion border	Basal cell carcinoma is a common malignant lesion excised from facial sites using `11640` when small (≤0.5 cm).
`C44.312`	Basal cell carcinoma of skin of left lip, vermillion border	Same as above for left-sided lesions; laterality affects modifier reporting (`LT`/`RT`).
`C44.319`	Basal cell carcinoma of skin of lip, unspecified	When laterality not specified at time of coding.
`C44.101`	Malignant neoplasm of skin of unspecified eyelid, including canthus	Eyelid skin cancers are within the anatomic sites described by `11640`.
`C44.302`	Squamous cell carcinoma of skin of left eyelid, including canthus	Squamous cell carcinoma is another indication for narrow-margin excision on facial sites.
`D04.1`	Carcinoma in situ of skin of lip	In situ lesions of facial skin may be treated with excision coded to appropriate malignant excision codes or in situ-specific codes depending on documentation.
`C44.91`	Malignant neoplasm of skin, unspecified, unspecified site	Used when specific facial site is not documented but malignancy is present; not ideal but encountered in practice.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`11102`	Tangential biopsy of skin (shave), single lesion	May be performed prior to excision as diagnostic biopsy to establish malignancy.
`11100`	Biopsy of skin, single lesion, punch	Alternative diagnostic biopsy technique before definitive excision.
`88305`	Level IV surgical pathology, gross and microscopic examination	Common pathology billing code for processing and microscopic examination of an excised malignant skin lesion.
`12051`	Repair, intermediate, wound face, 2.6 cm to 7.5 cm	Used when more complex layered closure is required after excision when length meets code criteria.
`13131`	Repair complex, face, forehead, ears, eyelids, nose, lips; 1.1 cm to 2.5 cm	Used for more complex repairs of facial defects after excision when tissue rearrangement is needed.
`29899`	Unlisted procedure, arthroscopy; (example placeholder)	If an uncommon reconstructive technique not described by existing codes is performed, an unlisted code may be reported with documentation.

`26`	Professional component	When only the physician professional component of a service is reported separate from technical component (e.g., pathology professional fee billed separately).
`50`	Bilateral procedure	When identical excisions are performed on both sides in the same session.
`LT`	Left side	To indicate the procedure was performed on the left anatomical side.
`RT`	Right side	To indicate the procedure was performed on the right anatomical side.
`59`	Distinct procedural service	When a separate, distinct procedure or lesion is excised at a different site and not normally bundled.
`52`	Reduced services	When the service is partially reduced or not completed as described by the code.
`53`	Discontinued procedure	When the procedure is terminated due to extenuating circumstances.
`22`	Increased procedural services	For unusual procedural service requiring additional work beyond typical for the code (must be documented).
`23`	Unusual anesthesia	When general anesthesia is required for a procedure usually performed with local anesthesia.
`76`*	Repeat procedure by same physician	When a procedure is repeated subsequent to the original within the same session or on same day.
`78`	Unplanned return to the operating/procedure room by the same physician following initial procedure for a related procedure during the postoperative period	For management of a complication requiring return to OR/procedure room.
`79`	Unrelated procedure or service by the same physician during the postoperative period	When an unrelated procedure is performed during the global period.
`22`	Increased procedural services	(listed once above) Documented when complexity or time exceed typical expectations.