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    OpenPayerBilling CodesRepair, Revision, and/or Reconstruction Procedures on the Neck (Soft Tissues) and ThoraxCPT cpt-21700-scalenus-anticus-muscle-division-neck-release
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    CPT 21700: Scalenus Anticus Muscle Division, Neck Surgery

    Medicare pays $334 on average nationally for this procedure.

    CPT code 21700 describes surgical division of the scalenus anticus muscle on the side of the neck to treat scalenus anticus syndrome; this is a neck soft-tissue surgical procedure (open muscle division) typically performed in an operating room or ambulatory surgical center as a therapeutic surgical service to relieve nerve compression symptoms.

    For related coverage guidance, see recent payer policy updates: Surgical Procedures, Outpatient Surgical Procedures - Site of Service, Site of Service Ambulatory Service Center (ASC) Select — Surgical or Diagnostic Procedures in Adults.

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    Table of contents

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    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.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    61782Stereotactic radiosurgery; percutaneous image-guided cranial lesion ablation — (Note: code listed here as unrelated example)Data not available in the input.
    64718Neuroplasty and/or transposition; peripheral nerve, other than median, ulnar, digital, or major nerveMay be performed when scalene division is combined with brachial plexus neurolysis or peripheral nerve decompression
    21550Excision, 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
    69990Preparation 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
    31500Intubation, endotracheal, emergency or elective; conventionalRepresents airway management typically performed prior to this procedure
    99223Initial hospital care, typically 70 minutes or moreRepresents preoperative evaluation and perioperative hospital care for major procedures like scalene division

    Related Modifiers

    11 rows

    ModifierDescriptionWhen to Use
    22Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…
    26Modifier 26 (Professional Component) identifies and bills only the professional portion of a split service — the physician’s interpretation, report, and medical judgment — when the technical…- Use CPT Modifier -26 when you are billing only the professional component (PC) of a split‑bill eligible service—i.e., you performed the physician interpretation, medical judgment and prepared a…
    50Modifier –50 (Bilateral Procedure) is appended to a CPT code when an identical procedure is performed on paired anatomical structures during the same operative session. The AMA states to add…- Use modifier -50 when the same CPT surgical, diagnostic, or radiology procedure is performed on paired anatomical structures (both sides of the body) during the same operative/session by the same…
    52Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
    53Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
    62Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…
    66Modifier 66 (Surgical Team) is used when three or more surgeons act as primary surgeons on a single, highly complex procedure. The AMA defines it for use when a surgical team — often composed of…- Use modifier 66 when three or more surgeons act as primary surgeons working collaboratively as a surgical team on a single, highly complex or difficult procedure (for example organ…
    76Modifier -76, Repeat Procedure or Service by Same Physician or Other Qualified Health Care Professional, is appended when the same provider performs an identical, medically necessary procedure or…- Use modifier -76 when the same physician or other qualified health care professional performs an identical procedure or service a second (or subsequent) time on the same date of service and the…
    77Modifier 77 indicates that a previously performed procedure or service was legitimately repeated by a different physician or other qualified health care professional. The AMA’s CPT definition…- Use modifier 77 when a basic procedure or service already performed is repeated by a different physician or other qualified health care professional (for example, a second provider independently…
    78CPT modifier -78 indicates an unplanned, related return to the operating or procedure room by the same provider during the global postoperative period. It is appended when treatment for a…- Use modifier -78 when an unplanned, related complication during the original procedure’s global postoperative period requires the patient to return to a formal operating or procedure room and the…

    Showing 1–10 of 11

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207P00000X
    2084P0800X
    208000000X
    363L00000X
    207R00000X
    261QP2400X
    177F00000X
    207KI0005X

    Related ICD-10-CM Codes

    23 rows

    ICD-10-CM CodeDescription
    G44.1Vascular headache, not elsewhere classified
    G44.209Tension-type headache, unspecified, not intractable
    G54.0Brachial plexus disorders
    G54.1Lumbosacral plexus disorders
    G54.2Cervical root disorders, not elsewhere classified
    G54.3Thoracic root disorders, not elsewhere classified
    G56.01Carpal tunnel syndrome, right upper limb
    G56.02Carpal tunnel syndrome, left upper limb
    G89.3Neoplasm related pain (acute) (chronic)
    M25.561Pain in right knee

    Showing 1–10 of 23

    Related Payer Policy Updates

    Specialty: General Surgery1 / 3

    10 rows

    PolicyPayerEffective Date
    Surgical ProceduresUnitedHealthcare2026-09-01
    Outpatient Surgical Procedures - Site of ServiceUnitedHealthcare2026-09-01
    Site of Service Ambulatory Service Center (ASC) Select — Surgical or Diagnostic Procedures in AdultsPremera Bluecross2026-09-01
    Site of Service Ambulatory Surgical Center (ASC) Select — Surgical or Diagnostic Procedures in AdultsPremera Bluecross2026-09-01
    Site of Service Ambulatory Service Center (ASC) SelectPremera Bluecross2026-09-01
    Site of Service Ambulatory Surgical Center (ASC) Select — Site of Service for Ambulatory Surgical Procedures (ASC Select)Premera Bluecross2026-09-01
    Site of Service Ambulatory Service Center (ASC) SelectPremera Bluecross2026-09-01
    Outpatient Surgical Procedures - Site of Servicesierra health and life2026-08-01
    Medical Necessity Guidelines — Inpatient Surgical CareMass General Brigham Health Plan2026-08-01
    Ambulatory Surgery Center (ASC) - Site of Care PolicyKaiser Permanente2026-08-01

    Related Codes

    CPT-21685-HYOID-SUSPENSION-FOR-AIRWAY-MANAGEMENT

    CPT 21685: Hyoid Suspension for Airway Support

    CPT-21705-SCALENUS-ANTICUS-MUSCLE-DIVISION-CERVICAL-RIB-REMOVAL

    CPT 21705: Scalenus Anticus Division with Cervical Rib Removal

    CPT-21720-STERNOCLEIDOMASTOID-MUSCLE-RELEASE-TORTICOLLIS

    CPT 21720: Sternocleidomastoid Muscle Division for Torticollis

    CPT-21725-STERNOCLEIDOMASTOID-RELEASE-FOR-TORTICOLLIS

    CPT 21725: Sternocleidomastoid Division for Torticollis

    CPT-21740-CHEST-WALL-RECONSTRUCTION-PECTUS-DEFORMITY-REPAIR

    CPT 21740: Chest Wall Reconstruction for Congenital Deformity

    CPT-21742-MINIMALLY-INVASIVE-CHEST-WALL-RECONSTRUCTION-PECTUS

    CPT 21742: Minimally Invasive Chest Wall Reconstruction

    CPT-21743-THORACOSCOPIC-CHEST-WALL-RECONSTRUCTION-PECTUS-REPAIR

    CPT 21743: Thoracoscopic Chest Wall Reconstruction

    CPT-21750-STERNAL-SEPARATION-CLOSURE-STERNAL-REPAIR

    CPT 21750: Closure of Sternal Separation

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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