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    OpenPayerBilling CodesSurgical, Imaging Devices and GraftsHCPCS hcpcs-c1606-endoscopic-ultrasound-adapter-disposable
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    HCPCS C1606: Adapter for Ultrasound Attachment to Upper GI Endoscope

    HCPCS Level II code C1606 describes a single-use disposable adapter used to attach an ultrasound system to an upper gastrointestinal endoscope, supporting endoscopic ultrasound procedures; service type: endoscopic ultrasound accessory provision; typical site of service: hospital outpatient department or ambulatory surgery center during upper GI endoscopy/EUS procedures.

    For related coverage guidance, see recent payer policy updates: Hip Arthroplasty (partial and total hip replacement), Shoulder Arthroplasty (Total, Partial, Reverse, Revision and Resurfacing), Artificial Lumbar Intervertebral Disc (Lumbar Total Disc Arthroplasty).

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    Table of contents

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    Clinical & Coding Specifications

    Clinical Context

    A 62-year-old patient with suspected submucosal lesion in the proximal stomach is referred for an upper endoscopy with endoscopic ultrasound (EUS) to characterize a suspicious mass visualized on prior CT. The procedure is performed in an outpatient endoscopy suite under monitored anesthesia care. After standard EUS equipment preparation, a single-use disposable adapter (C1606) is attached to the upper gastrointestinal endoscope to interface the ultrasound transducer with the endoscope channel and coupling system. The endoscopist advances the endoscope to the stomach and performs radial and linear EUS imaging to evaluate the lesion, sample with fine-needle aspiration if indicated, and document sonographic features. The adapter is discarded after the procedure, and the patient is recovered in the post-anesthesia area before discharge with routine post-procedural instructions.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    43238Upper gastrointestinal endoscopy including esophagus, stomach, and either the duodenum; diagnostic, with or without collection of specimen by brushing or washingCore diagnostic endoscopy often performed in the same session as EUS requiring the adapter.
    43259Upper gastrointestinal endoscopy, flexible, transoral; with endoscopic ultrasound examination and guided fine needle aspiration/biopsy(s)EUS with FNA — commonly performed in conjunction with the adapter to obtain tissue samples.
    43239Upper gastrointestinal endoscopy with biopsy, single or multipleMucosal biopsies frequently performed alongside EUS imaging when indicated.
    76937Ultrasound, transrectal or periprostatic; real-time with image documentation, guided needle placementExample of ultrasound-guided needle placement CPT; conceptually similar to EUS-guided FNA requiring imaging adapter interface.
    00740Anesthesia for upper gastrointestinal endoscopic procedures, endoscope provided by anesthesiologistAnesthesia CPT that may be reported if general anesthesia or advanced airway management is provided during complex EUS procedures.

    Related Modifiers

    8 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…
    23Modifier -23 (Unusual Anesthesia) is used on anesthesia service CPT codes when a procedure that normally requires no anesthesia or only local anesthesia must be performed under general anesthesia…- Use modifier -23 only on anesthesia CPT codes (00100–01999) when a procedure that normally requires no anesthesia or only local anesthesia must be performed under general anesthesia because of…
    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…
    54Modifier ‑54 (“Surgical care only”) is appended to a CPT surgical procedure when the reporting surgeon performs the intraoperative (surgical) component but does not furnish the preoperative and/or…- Use modifier -54 when the reporting surgeon provided only the intraoperative (surgical) component of a procedure and preoperative and/or postoperative management has been or will be provided by…
    55Modifier –55 indicates the billing provider furnished only postoperative management for a procedure that has a global surgical period. According to AAPC, this modifier is appended to the same CPT…- Use modifier -55 when billing the same CPT surgical code that has a 10- or 90-day global period and you, as a provider other than the original surgeon, furnished ONLY postoperative management (no…
    56Modifier ‑56 indicates the reporting provider furnished only the preoperative management for a surgical procedure and did not perform the intraoperative or postoperative care. It is used in…- Use Modifier -56 when a provider performs only the preoperative management in a split‑care situation (one physician manages preop care while a different physician performs the intraoperative…
    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…

    Related Provider Taxonomies

    8 rows

    Taxonomy CodeSpecialtyNotes
    208D00000XGeneral Practice PhysicianA physician who specializes in the general practice of diagnosing, treating, and managing patients with a variety of illnesses and conditions.
    363L00000XNurse Practitioner(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision mak…
    363A00000XPhysician AssistantA physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and…
    164W00000XLicensed Practical NurseAn individual with post-high school vocational training and practical experience in the provision of nursing care at a level less than that required f…
    163WN0003XLow-Risk Neonatal Registered NurseNursing Service Providers · Registered Nurse
    320800000XMental Illness Community Based Residential Treatment FacilityA home-like residential facility providing psychiatric treatment and psycho/social rehabilitative services to individuals diagnosed with mental illnes…
    2084S0012XSleep Medicine (Psychiatry & Neurology) PhysicianA Psychiatrist or Neurologist who practices Sleep Medicine is certified in the subspecialty of sleep medicine and specializes in the clinical assessme…
    3336S0011XSpecialty PharmacyA pharmacy that dispenses generally low volume and high cost medicinal preparations to patients who are undergoing intensive therapies for illnesses t…

    Related ICD-10-CM Codes

    24 rows

    ICD-10-CM CodeDescription
    C15.9Malignant neoplasm of esophagus, unspecified
    C16.9Malignant neoplasm of stomach, unspecified
    D12.6Benign neoplasm of colon, unspecified
    D13.0Benign neoplasm of esophagus
    K21.9Gastro-esophageal reflux disease without esophagitis
    K22.2Esophageal obstruction
    K22.3Perforation of esophagus
    K25.9Gastric ulcer, unspecified as acute or chronic, without hemorrhage or perforation
    K26.9Duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation
    K27.9Peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or perforation

    Showing 1–10 of 24

    Related Payer Policy Updates

    Specialty: Orthopedics/Musculoskeletal1 / 2

    7 rows

    PolicyPayerEffective Date
    Hip Arthroplasty (partial and total hip replacement)univerahealthcare2026-10-15
    Shoulder Arthroplasty (Total, Partial, Reverse, Revision and Resurfacing)univerahealthcare2026-10-15
    Artificial Lumbar Intervertebral Disc (Lumbar Total Disc Arthroplasty)univerahealthcare2026-10-15
    Metal-on-Metal Total Hip Resurfacinguniverahealthcare2026-10-15
    Lumbar Fusion (arthrodesis) with decompressionuniverahealthcare2026-10-15
    Osteochondral Grafting of the Kneeuniverahealthcare2026-10-15
    Sacroiliac Joint Fusion or Stabilizationuniverahealthcare2026-10-15

    Related Codes

    HCPCS-C1600-INTRAVASCULAR-LESION-PREPARATION-BLADED-CATHETER

    HCPCS Level II C1600: Transluminal Lesion Preparation Bladed Sheathed Catheter

    HCPCS-C1601-DISPOSABLE-PULMONARY-ENDOSCOPE-IMAGING

    HCPCS Level II C1601: Single-Use Pulmonary Imaging/Illumination Endoscope

    HCPCS-C1602-ABSORBABLE-ANTIMICROBIAL-BONE-VOID-FILLER-IMPLANTABLE

    HCPCS C1602: Absorbable Antimicrobial-Eluting Bone Void Filler

    HCPCS-C1603-IVC-FILTER-RETRIEVAL-LASER-DEVICE

    HCPCS Level II C1603: Laser Retrieval Device for IVC Filter

    HCPCS-C1604-TRANSMURAL-TRANSVENOUS-ARTERIAL-BYPASS-GRAFT-IMPLANTABLE

    HCPCS C1604: Graft, Transmural Transvenous Arterial Bypass (Implantable)

    HCPCS-C1605-LEADLESS-DUAL-CHAMBER-PACEMAKER-IMPLANTATION

    HCPCS C1605: Leadless Dual-Chamber Pacemaker Implantation

    HCPCS-C1607-IMPLANTABLE-RECHARGEABLE-NEUROSTIMULATOR-INTEGRATED

    HCPCS Level II C1607: Implantable Rechargeable Neurostimulator

    HCPCS-C1608-TOTAL-DUAL-MOBILITY-FIRST-CARPOMETACARPAL-PROSTHESIS

    HCPCS Level II C1608: Total Dual Mobility Prosthesis, First CMC Joint

    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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