CPT 21700: Scalenus Anticus Muscle Division for Neck Nerve Compression
CPT code 21700 denotes surgical division of the scalenus anticus muscle to relieve scalenus anticus syndrome, a painful condition caused by muscular compression of adjacent nerves. Nationally, this code represents a specific, targeted cervical soft-tissue surgical service performed by otolaryngology, head and neck, or peripheral nerve surgery specialists. The procedure matters because it addresses a defined anatomical cause of neurogenic or myofascial pain and influences utilization of operative outpatient and inpatient resources.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for the procedure, typical sites of service, and the operational framing needed for billing and coding workflows. The publication outlines common payment and coverage considerations, variation in payer handling, and benchmarking context where available. Additionally, readers will gain insight into documentation elements and coding alignment relevant to surgical release of the scalenus anticus muscle. Data not available in the input will be identified as such in relevant sections.
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Billing Code Overview
CPT code 21700 describes a surgical procedure in which a provider divides the scalenus anticus muscle at the side of the neck to treat scalenus anticus syndrome. This procedure is performed to relieve painful compression of nearby nerves caused by the scalenus anticus muscle.
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Service type: Surgical procedure, neck muscle release
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Typical site of service: Hospital operating room or ambulatory surgery center
Clinical & Coding Specifications
Clinical Context
A 42-year-old patient presents to an otolaryngology or neurosurgery clinic with months of unilateral neck pain, radiating paresthesia into the ipsilateral upper extremity, and weakness that worsens with arm elevation and certain neck positions. Conservative care including physical therapy, activity modification, and selective scalene muscle injections provided temporary or incomplete relief. Clinical examination demonstrates reproduction of symptoms with scalene muscle stretch and localized tenderness over the lateral neck. Imaging and electrodiagnostic testing exclude cervical radiculopathy from disc disease and identify neurovascular compression consistent with scalenus anticus (anterior scalene) syndrome. After multidisciplinary evaluation and informed consent, the patient is scheduled for operative division (scalenectomy/scalenotomy) of the scalenus anticus muscle to decompress the brachial plexus elements.
Typical workflow: Preoperative evaluation and clearance; surgical time-out; general endotracheal anesthesia; small transverse or oblique neck incision over the anterior scalene region; careful dissection to identify the anterior scalene muscle, phrenic nerve, and brachial plexus; division or partial excision of the scalenus anticus muscle; hemostasis and layered closure. Postoperative monitoring for respiratory compromise, diaphragmatic dysfunction (phrenic nerve), hematoma, and pain control; discharge same day or after overnight observation depending on comorbidities. Follow-up with wound check and physical therapy as indicated.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
11 | E/M services furnished as the normal course of a physician's practice | Use when the procedure is performed by the reporting provider as their usual service setting and no unusual circumstances apply |
22 | Increased procedural services | Use when operative complexity or additional work (e.g., extensive scarring, redo surgery) significantly increases the procedural work |
26 | Professional component | Use when only the surgeon's professional component is reported separate from technical hospital services (rare for this procedure) |
50 | Bilateral procedure | Use when scalene muscle division is performed on both left and right sides during the same operative session |
52 | Reduced services | Use when a planned procedure is partially reduced or not fully performed |
53 | Discontinued procedure | Use when the procedure is started but discontinued due to extenuating circumstances (e.g., unexpected anatomy, patient instability) |
62 | Two surgeons | Use when two surgeons work together as primary surgeons performing distinct portions of the scalenus procedure |
66 | Surgical team | Use when a documented surgical team (e.g., team of specialists) performs the operation |
76 | Repeat procedure by same physician | Use when the same physician repeats the scalene division procedure during the postoperative period (if applicable) |
77 | Repeat procedure by another physician | Use when a second physician repeats the procedure during the postoperative period |
78 | Return to the operating room for a related procedure during the global period | Use if the patient returns to the OR for a complication related to the original scalenus procedure (e.g., hematoma evacuation) |
79 | Unrelated procedure or service during the postoperative period | Use when an unrelated procedure is performed during the global period |
LT | Left side | Use to identify the left-sided procedure when laterality is relevant |
RT | Right side | Use to identify the right-sided procedure when laterality is relevant |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
| 207P00000X | Otolaryngology (ENT) | Frequently performs neck and brachial plexus decompression involving anterior scalene muscle |
| 2084P0800X | Neurological Surgery | May perform scalenus procedures when brachial plexus or neurovascular compression requires neurosurgical approach |
| 208000000X | Orthopaedic Surgery | Peripheral nerve surgeons within orthopedics may perform scalene muscle division for neurogenic compression |
| 363L00000X | Physical Medicine & Rehabilitation | Involved in preoperative evaluation and postoperative rehabilitation, not typically the operating surgeon |
| 207R00000X | Head & Neck Surgery | Subspecialists who manage complex neck procedures involving muscular decompression |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
G54.3 | Brachial plexus disorders | Directly relevant when anterior scalene compression causes brachial plexus neuropathy and is an indication for scalenus division |
M54.2 | Cervicalgia | Often present as a symptom prompting evaluation; may be associated with muscle-related compression syndromes |
M54.12 | Radiculopathy, cervical region | Included when nerve root symptoms are present and need differentiation from brachial plexus compression |
G56.4 | Thoracic outlet syndrome (if indexed here as nerve entrapment) | Represents neurovascular compression of the thoracic outlet region; anterior scalene division is a surgical treatment for neurogenic thoracic outlet syndrome |
R07.89 | Other chest pain | Sometimes reported when pain radiates toward chest from neck and shoulder region, aiding in differential diagnosis |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
61782 | Stereotactic radiosurgery; percutaneous image-guided cranial lesion ablation — (Note: code listed here as unrelated example) | Data not available in the input. |
64718 | Neuroplasty and/or transposition; peripheral nerve, other than median, ulnar, digital, or major nerve | May be performed when scalene division is combined with brachial plexus neurolysis or peripheral nerve decompression |
21550 | Excision, tumor, soft tissue of neck (less than 3 cm) | May be used if concomitant excision of a soft tissue mass in the anterior scalene region is performed during the same operative episode |
69990 | Preparation and application of skin substitute graft, first stage (includes outpatient application) | May be used for complex wound closure or reconstructive needs following extensive neck dissection |
31500 | Intubation, endotracheal, emergency or elective; conventional | Represents airway management typically performed prior to this procedure |
99223 | Initial hospital care, typically 70 minutes or more | Represents preoperative evaluation and perioperative hospital care for major procedures like scalene division |