Summary & Overview
CPT 54100: Biopsy of Superficial Penile Skin Lesion, Diagnostic
CPT code 54100 denotes a diagnostic superficial skin biopsy of the penis, a focused ambulatory procedure used to obtain tissue for histologic diagnosis of penile mucocutaneous or dermal lesions. Nationally, accurate coding for this procedure is important for clinical documentation, appropriate claim adjudication, and tracking of dermatologic and urologic diagnostic services. The code applies primarily to outpatient settings such as dermatology or urology offices and ambulatory surgical centers and is commonly used when providers need definitive pathology for lesions suspicious for infection, inflammatory disease, or neoplasia.
Key payers included in this analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of what CPT code 54100 represents, typical sites of service, and the clinical context in which the code is applied. The publication also summarizes how this code fits within common billing workflows, lists commonly encountered modifiers, and identifies areas where documentation typically influences payment and denial risk. Data not available in the input is noted where applicable. This resource is intended to clarify coding intent and support consistent use of CPT code 54100 across payers and clinical settings.
Billing Code Overview
CPT code 54100 describes a biopsy of a superficial skin lesion of the penis performed for diagnostic purposes. The procedure involves the provider collecting a tissue sample from a visible or palpable lesion on the penile skin to obtain material for histopathologic examination.
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Service type: Diagnostic biopsy (skin lesion)
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Typical site of service: Outpatient clinic, dermatology or urology office, ambulatory surgical center
Clinical & Coding Specifications
Clinical Context
A man in his 50s presents to the outpatient urology clinic with a persistent, superficial lesion on the penile skin that is erythematous, scaly, and non-healing despite topical therapy. The provider performs a focused history and physical, documents lesion size, location (glans, foreskin, or shaft), duration, symptoms (pain, bleeding, pruritus), and prior treatments. After informed consent, the clinician performs a superficial excisional or punch biopsy of the penile skin under local anesthesia in the clinic procedure room to obtain tissue for histopathologic diagnosis (e.g., to distinguish benign dermatoses, lichen sclerosus, infectious causes, or squamous cell carcinoma). Specimens are labeled, submitted with relevant clinical history, and the patient is given wound care and follow-up instructions. If pathology returns malignant or suspicious results, the workflow proceeds to staging, counseling, and definitive surgical management or oncology referral as indicated.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
25 | Significant, separately identifiable evaluation and management service on the same day | When a distinct E/M is performed and documented on the same date as the biopsy |
22 | Increased procedural services |