CPT 00164: Anesthesia for Soft Tissue Biopsy of Nose and Accessory Sinuses
CPT code 00164 represents anesthesia services delivered for a soft tissue biopsy of the nose and accessory sinuses. This code captures perioperative anesthesia care specific to biopsy procedures on nasal and paranasal sinus soft tissues and is used in facility and professional billing to denote the anesthesia component of these ENT procedures. Nationally, accurate use of CPT code 00164 ensures appropriate classification of anesthesia services tied to minor head and neck diagnostic procedures and supports consistent claims processing across payers.
Key payers covered in this review include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an outline of clinical context for nasal and sinus biopsy anesthesia, typical sites of service, and how CPT code 00164 relates to nearby anesthesia codes for nose and accessory sinus procedures. The publication presents payer coverage considerations and common billing modifiers used with anesthesia codes to reflect unusual circumstances, bilateral procedures, and splits of professional responsibilities. Related anesthesia codes for nose and accessory sinus procedures are noted for coding alignment.
This summary is intended to inform coding, billing, and revenue cycle staff, as well as clinicians and administrators, about the clinical scope and billing context for CPT code 00164 and where it fits among anesthesia services for nasal and sinus procedures.
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Billing Code Overview
CPT code 00164 describes anesthesia services provided for a soft tissue biopsy of the nose and accessory sinuses. The service involves administration and management of anesthesia to enable surgical biopsy of nasal and paranasal sinus soft tissues.
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Service type: Anesthesia for soft tissue biopsy of the nose and accessory sinuses
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Typical site of service: Operating room or procedure suite where ENT procedures, including nasal and sinus biopsies, are performed
Clinical & Coding Specifications
Clinical Context
A 48-year-old patient presents to the otolaryngology clinic with months of nasal obstruction, intermittent epistaxis, and purulent drainage. Office nasal endoscopy identifies a suspicious mass in the right nasal cavity and chronic changes of the accessory sinuses. After CT imaging and discussion, the otolaryngologist schedules a soft tissue biopsy of the nose and accessory sinuses under general anesthesia to obtain tissue for histopathology and to control bleeding. The anesthesia team performs preoperative assessment, documents ASA physical status (commonly P1–P3), establishes monitoring and intravenous access in the pre-op area, and delivers general endotracheal anesthesia with appropriate airway management. Intraoperative responsibilities include maintenance of anesthesia, hemodynamic monitoring, blood loss management, and immediate postoperative handoff to the PACU team. Typical site of service is an ambulatory surgical center or hospital operating room. The procedure is billed using 00164 for anesthesia services specific to soft tissue biopsy of the nose and accessory sinuses, with diagnosis codes such as J34.2, J32.9, or J33.9 listed as primary or secondary as clinically applicable.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when anesthesia required significantly greater work due to unusual events or complexity beyond typical for 00164. |
23 | Unusual anesthesia | Use when medically necessary anesthesia is provided but the procedure is normally done without anesthesia (rarely applicable but available if local anesthesia would typically be used). |
50 | Bilateral procedure | Use when identical procedures are performed on both sides of the nose/sinuses and payer requires bilateral reporting for anesthesia attribution. |
52 | Reduced services | Use when the planned biopsy is partially performed or scope of anesthesia service is reduced. |
53 | Discontinued procedure | Use when the procedure is started but terminated for clinical reasons and anesthesia care was provided up to termination. |
54 | Surgical care only | Use when the anesthesiologist provides only intraoperative care and another clinician provides pre/postoperative anesthesia management (rare for anesthesiology claims). |
55 | Postoperative management only | Use when the anesthesiologist provides only postoperative management. |
62 | Two surgeons | Use when two surgeons of different specialties simultaneously perform portions of the operative procedure affecting anesthesia complexity. |
78 | Return to the operating room for a related procedure during the global period | Use when patient requires an additional operative trip for the same diagnosis and additional anesthesia is provided. |
AA | Anesthesia services performed personally by anesthesiologist | Use when the billed anesthesiologist personally furnishes the anesthesia service. |
AD | Medical direction of one CRNA by anesthesiologist | Use when the anesthesiologist medically directs one CRNA during the anesthesia for 00164. |
AS | Physician assistant, nurse practitioner, or clinical nurse specialist service | Use when an eligible non-physician anesthesia provider bills under their allowed circumstances per payer rules. |
QK | Medical direction of two, three, or four CRNAs/AA by anesthesiologist | Use when the anesthesiologist medically directs multiple qualified anesthesia providers. |
QS | Monitored anesthesia care service | Use when monitored anesthesia care is provided rather than general anesthesia and payer requires separate identification. |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
207L00000X | Anesthesiology | Primary specialty for billing and reporting anesthesia services for 00164. |
207LA0401X | Pain Medicine (Anesthesiology) | Applicable when perioperative pain management or regional analgesia for sinonasal procedures is provided by an anesthesiologist with pain subspecialty. |
207LC0200X | Critical Care Medicine (Anesthesiology) | Applicable when patients require perioperative critical care-level management related to airway or hemodynamic instability during sinonasal biopsy procedures. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
J34.2 | Deviated nasal septum | Anatomical deviation that may contribute to obstruction and guide biopsy location or surgical approach for tissue sampling. |
J32.9 | Chronic sinusitis, unspecified | Chronic inflammatory disease of the sinuses that can produce mucosal changes or masses requiring biopsy to exclude other pathology. |
J34.89 | Other specified disorders of nose and nasal sinuses | Captures specific but less common anatomic or inflammatory disorders of the nose/sinuses that may prompt biopsy. |
J33.9 | Nasal polyp, unspecified | Polypoid lesions frequently biopsied to confirm inflammatory versus neoplastic etiology. |
J34.3 | Hypertrophy of nasal turbinates | Turbinate enlargement contributing to obstruction and occasionally biopsied when atypical appearance raises concern for other pathology. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
00160 | Anesthesia for procedures on nose and accessory sinuses; not otherwise specified | General anesthesia code used for other sinonasal procedures that may be less specific than 00164; selected when procedure details do not match biopsy-specific descriptor. |
00162 | Anesthesia for procedures on nose and accessory sinuses; radical surgery | Used when a more extensive or radical sinonasal surgery is performed rather than a limited soft tissue biopsy; indicates higher complexity and anesthesia intensity. |
00170 | Anesthesia for procedures on intraoral procedures, including biopsy | Used when the biopsy site is intraoral or crosses into the oral cavity rather than confined to the nasal cavity/accessory sinuses; helps distinguish service location and anesthetic planning. |