Summary & Overview
CPT 21555: Excision of Subcutaneous Mass <3 cm, Neck/Anterior Chest
CPT code 21555 represents the surgical excision of a subcutaneous mass under 3 cm in the neck or anterior chest with submission of the specimen for pathologic diagnosis. Nationally, this code captures a common minor surgical procedure used to remove and diagnose superficial soft-tissue lesions, balancing diagnostic needs with ambulatory care efficiency. The code is relevant to surgical, dermatologic, and otolaryngology practice settings and to payers managing outpatient procedural utilization and pathology costs.
Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context, expected sites of service, and the procedural intent for this excision code. The publication outlines common billing considerations, frequently used modifiers provided in the input, and how the service typically maps to outpatient surgical workflows.
The report also summarizes benchmarks and policy-relevant points: where this code fits within outpatient minor surgery billing, implications for specimen submission and pathology charge capture, and factors that influence site-of-service selection. Practical takeaways include understanding the clinical scenarios that generate use of CPT code 21555, typical care settings, and the payers commonly involved in coverage and claims adjudication. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 21555 describes excision of a subcutaneous mass less than 3 cm located in the neck or anterior chest, with submission of the specimen for pathological analysis. This procedure involves removal of an abnormal growth just below the skin surface for diagnostic and therapeutic purposes.
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Service type: Surgical excision of subcutaneous mass, diagnostic specimen submitted
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Typical site of service: Outpatient surgical suite, ambulatory surgery center, or clinic procedure room
Clinical & Coding Specifications
Clinical Context
A 42-year-old patient presents to an outpatient surgical clinic with a palpable, mobile subcutaneous mass in the anterior neck just inferior to the mandible, measuring approximately 1.8 cm on clinical exam and ultrasound. The mass is suspected to be an epidermal inclusion cyst versus benign lipoma; the provider plans a focused excision of the lesion with submission of the specimen for pathologic analysis to establish a definitive diagnosis. The procedure is performed under local anesthesia in a minor procedure room within the ambulatory surgery center. The workflow includes pre-procedure consent, localized infiltration with lidocaine with epinephrine, a 1.5–2.5 cm incision, dissection of the subcutaneous mass intact when feasible, hemostasis, layered closure, and submission of the specimen to surgical pathology. Post-procedure instructions include wound care, activity restrictions, and follow-up for pathology results and wound check. This presentation and procedure align with the elements described by 21555 (excision of a subcutaneous mass less than 3 cm from the neck or anterior chest with specimen sent for pathologic examination).
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
25 | Significant, separately identifiable evaluation and management service by the same physician on the day of the procedure | Use when a distinct E/M visit is documented the same day as (e.g., new problem assessment and decision-making beyond pre-procedural consent). |