Summary & Overview
CPT 10004: Fine Needle Aspiration, Additional Lesion
CPT code 10004 represents a fine needle aspiration (FNA) performed to collect a diagnostic specimen from a tissue, cyst, or mass and is reported for each additional lesion biopsied beyond the primary FNA (primary code 10021). Nationally, FNAs are commonly used to establish cytologic diagnosis with minimal invasiveness, impacting outpatient procedural volumes and pathology service utilization. Understanding billing for additional lesions is important for accurate coding, claims adjudication, and resource planning.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical context for FNA services, the typical sites of service, and what the code represents in billing workflows. The publication provides benchmarks where available, common coding and billing considerations, and notes on payer coverage patterns and policy updates relevant to diagnostic biopsy services. It also outlines typical clinical scenarios that prompt additional lesion FNAs and describes how reporting additional lesion codes interacts with primary procedure coding.
Data not available in the input is identified where applicable. The content is presented for a national audience and focuses on clinical and billing context rather than state-specific policy.
Billing Code Overview
CPT code 10004 describes a fine needle aspiration (FNA) performed to obtain a diagnostic specimen from tissue, a cyst, or a mass. This code is reported for each additional lesion biopsied when a primary FNA is reported with CPT code 10021.
Service Type: Diagnostic biopsy (fine needle aspiration)
Typical Site of Service: Outpatient clinic, physician office, or ambulatory surgical center
Clinical & Coding Specifications
Clinical Context
A 54-year-old female presents to an outpatient surgical clinic with multiple palpable subcutaneous nodules in the right breast. Imaging with diagnostic ultrasound identifies a dominant cystic lesion and two additional suspicious solid masses. The surgeon performs a diagnostic fine needle aspiration (FNA) of the dominant lesion under ultrasound guidance for immediate cytologic evaluation, and then performs additional FNAs of the two separate masses during the same visit. Specimens are labeled individually and submitted for cytopathology. The procedure is typically performed in an ambulatory surgery center or outpatient clinic procedure room with local anesthesia; it can also occur in a hospital outpatient department. Documentation includes indication, lesion locations, number of lesions aspirated, technique (ultrasound guidance or palpation), number of passes per lesion, specimen handling, and any immediate complications.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
11 | Normal, pre‑existing service | Use when this procedure is part of the routine service by the performing practitioner (rarely applied to FNA billing; follow payer rules). |
22 | Increased procedural services | Use when documented work required is substantially greater than typical (extensive additional time, difficult access) and supported by documentation. |
23 | Unusual anesthesia | Use when general anesthesia or deep sedation is required for the FNA and is unusual for the procedure. |
50 | Bilateral procedure | Use when bilateral lesions are aspirated and payer requires a bilateral modifier instead of separate line items. |
51 | Multiple procedures | Use when multiple distinct procedures are billed on the same date (check payer bundling rules). |
52 | Reduced services | Use when the procedure was partially reduced or not completed as documented. |
53 | Discontinued procedure | Use when the procedure was started but terminated due to complications or patient intolerance. |
62 | Two surgeons | Use when two surgeons work together as primary surgeons on the procedure. |
66 | Surgical team | Use when a surgical team performed portions of the care as documented. |
76 | Repeat procedure by same physician | Use when the same physician repeats the FNA during the postoperative period or same encounter (not in provided modifier list; not included) |
78 | Unplanned return to OR/procedure | Use when an unplanned return to the procedure room/OR is required for a related procedure (e.g., complication management). |
80 | Assistant surgeon | Use when an assistant surgeon documents participation in the procedure. |
81 | Minimum assistant surgeon | Use when a minimal assistant role is documented. |
62 | Two surgeons | (duplicate entry avoided) |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
208000000X | General Surgery | Frequently performs FNAs of superficial masses, breasts, and soft tissue lesions. |
207K00000X | Otolaryngology (ENT) | Performs FNAs of head and neck masses, thyroid and salivary lesions. |
207L00000X | Plastic Surgery | Performs FNAs when managing soft tissue masses, cysts, or reconstructive concerns. |
207R00000X | Dermatology | Performs FNAs of cutaneous and subcutaneous nodules and cysts. |
207P00000X | Pathology (Anatomic) | May perform FNAs for immediate onsite cytopathology evaluation and interpretation. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
R22.2 | Localized swelling, mass and lump, trunk | Frequently used when a patient presents with a palpable mass on the trunk requiring FNA. |
R22.31 | Localized swelling, mass and lump, right upper limb | Used for palpable masses in the extremities aspirated by FNA. |
R22.32 | Localized swelling, mass and lump, left upper limb | Same as above for the contralateral limb. |
N63 | Unspecified lump in breast | Common indication for breast FNAs. |
E04.9 | Nontoxic goiter, unspecified | Used when thyroid nodules undergo FNA for diagnostic evaluation. |
C44.9 | Malignant neoplasm of skin, unspecified | Used when a suspicious skin lesion or recurrent cutaneous tumor requires cytologic assessment. |
D49.2 | Neoplasm of uncertain behavior of connective and other soft tissue | Used when FNA is performed to characterize soft tissue masses. |
R59.0 | Localized enlarged lymph nodes | Common indication for FNA to evaluate lymphadenopathy. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
10021 | Fine needle aspiration; first lesion, without imaging guidance | Primary code for the first lesion aspirated; 10004 is reported for each additional lesion aspirated during the same session. |
76942 | Ultrasonic guidance for needle placement (eg, biopsy, aspiration, injection, localization device), imaging supervision and interpretation | Used when ultrasound guidance is performed for needle placement during FNA. |
88172 | Cytopathology, immediate evaluation (eg, adequacy of specimen) | Reported by pathology for on‑site adequacy assessment of FNA specimens. |
99000 | Handling and/or conveyance of specimen for transfer from physician to lab (historical) | Some payers accept specimen handling codes or separate lab handling charges; verify payer policy. |
11042 | Debridement; subcutaneous tissue (not typically for FNA) | Included here as infrequent related procedure when concurrent wound management is required (rare). |