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Official Description

Percutaneous transluminal mechanical thrombectomy and/or infusion for thrombolysis, dialysis circuit, any method, including all imaging and radiological supervision and interpretation, diagnostic angiography, fluoroscopic guidance, catheter placement(s), and intraprocedural pharmacological thrombolytic injection(s);

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The procedure described by CPT® Code 36904 involves a specialized intervention aimed at addressing blood clots within the dialysis circuit. This circuit may include components such as a central venous catheter (CVC), an arteriovenous (AV) fistula, or a synthetic AV graft. The primary goal of this procedure is to dissolve or mechanically remove thrombi that can obstruct blood flow, which is critical for effective dialysis treatment. Thrombosis is particularly prevalent in AV grafts, but can also occur in AV fistulas, leading to symptoms such as the absence of a palpable thrill or pulse at the site, swelling of the vessel, or lack of blood return upon needle insertion. To accurately assess the extent of the thrombus, imaging techniques like ultrasound or duplex Doppler studies may be employed. The procedure itself can involve either mechanical thrombectomy or the infusion of thrombolytic agents, such as heparin or tissue plasminogen activator (TPA), to facilitate clot dissolution. The intervention is performed under fluoroscopic guidance, ensuring precise catheter placement and monitoring throughout the process. This comprehensive approach includes diagnostic angiography to visualize the vascular anatomy and any residual clots or stenosis, which may necessitate further interventions such as balloon angioplasty or stent placement to restore optimal blood flow within the dialysis circuit.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure described by CPT® Code 36904 is indicated for the treatment of thrombosis within the dialysis circuit. The following conditions may warrant this intervention:

  • Thrombosis in AV Graft: The presence of blood clots in an arteriovenous graft, which is a common complication that can impede dialysis.
  • Thrombosis in AV Fistula: Blood clots forming in an arteriovenous fistula, leading to reduced blood flow and potential complications in dialysis treatment.
  • Absence of Thrill or Pulse: Clinical signs indicating thrombosis, such as the lack of a palpable thrill or pulse at the site of the fistula or graft.
  • Vessel Swelling or Distention: Physical examination findings that suggest obstruction due to thrombus formation.
  • Absence of Blood Flash: Difficulty in obtaining blood return upon needle insertion, indicating possible clot presence.

2. Procedure

The procedure for CPT® Code 36904 involves several critical steps to effectively address thrombosis in the dialysis circuit. Each step is designed to ensure thorough treatment and restoration of blood flow.

  • Accessing the AV Fistula: To perform thrombectomy on an AV fistula, needles are inserted at both ends of the thrombus. Guidewires are then introduced in a crossed configuration to facilitate subsequent interventions. Crossing sheaths are placed over the guidewires, allowing for the removal of the needles.
  • Injection of Thrombolytic Agent: A thrombolytic pharmaceutical agent, such as heparin or TPA, is injected into the fistula to initiate the dissolution of the clot. This step is crucial for breaking down the thrombus before mechanical removal.
  • Mechanical Thrombectomy: After a designated period, if any resistant clot remains, a thrombectomy catheter is inserted over the guidewire to mechanically evacuate the clot, restoring patency to the fistula.
  • Accessing the AV Graft: For thrombectomy on an AV graft, the procedure begins by accessing the venous segment, followed by the arterial segment. A needle is inserted in a downstream venous direction, and a guidewire is threaded through the clot.
  • Thrombolytic Injection via Sheath: The needle is exchanged for a vascular sheath, through which a thrombolytic agent is injected to facilitate clot dissolution in the graft.
  • Repeat Mechanical Thrombectomy: If residual clot is detected after the thrombolytic treatment, an embolectomy catheter is inserted over a guidewire to mechanically remove the clot from the arterial side of the graft.
  • Diagnostic Angiography: Following the thrombectomy, angiography of the dialysis circuit is performed to visualize any remaining blood clots or stenosis, which may require further intervention.
  • Balloon Angioplasty (if necessary): If stenosis is identified, a balloon-tipped catheter is inserted over a guidewire through the narrowed area. The balloon is inflated with dilute radiopaque contrast and visualized using fluoroscopy to ensure proper placement and effectiveness.
  • Stent Placement (if necessary): If stenosis persists after angioplasty, a fine mesh or wire stent is delivered to the stenotic area through the working channel of the vascular catheter. The stent expands to maintain vessel patency.
  • Closure and Monitoring: After the procedure, the catheter is removed, and a purse string suture may be placed to control any bleeding before the vascular sheath is withdrawn. Continuous monitoring is essential to ensure the success of the intervention.

3. Post-Procedure

Post-procedure care following CPT® Code 36904 involves monitoring the patient for any complications, such as bleeding or infection at the access site. Patients may require follow-up imaging to assess the success of the thrombectomy and to ensure that blood flow has been adequately restored. It is also important to evaluate the dialysis circuit for any signs of residual thrombosis or stenosis that may necessitate further intervention. Patients should be educated on signs and symptoms to watch for, such as changes in the thrill or pulse at the fistula or graft site, and instructed to report any concerns promptly. Regular follow-up appointments are essential to monitor the long-term patency of the dialysis circuit and the overall health of the patient.

Short Descr THRMBC/NFS DIALYSIS CIRCUIT
Medium Descr PERQ THRMBC/NFS DIALYSIS CIRCUIT IMG DX ANGRPH
Long Descr Percutaneous transluminal mechanical thrombectomy and/or infusion for thrombolysis, dialysis circuit, any method, including all imaging and radiological supervision and interpretation, diagnostic angiography, fluoroscopic guidance, catheter placement(s), and intraprocedural pharmacological thrombolytic injection(s);
Status Code Active Code
Global Days 000 - Endoscopic or Minor Procedure
PC/TC Indicator (26, TC) 0 - Physician Service Code
Multiple Procedures (51) 2 - Standard payment adjustment rules for multiple procedures apply.
Bilateral Surgery (50) 0 - 150% payment adjustment for bilateral procedures does NOT apply.
Physician Supervisions 09 - Concept does not apply.
Assistant Surgeon (80, 82) 1 - Statutory payment restriction for assistants at surgery applies to this procedure...
Co-Surgeons (62) 1 - Co-surgeons could be paid, though supporting documentation is required...
Team Surgery (66) 0 - Team surgeons not permitted for this procedure.
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator Hospital Part B services paid through a comprehensive APC
ASC Payment Indicator Device-intensive procedure added to ASC list in CY 2008 or later; paid at adjusted rate.
Type of Service (TOS) 2 - Surgery
Berenson-Eggers TOS (BETOS) P2F - Major procedure, cardiovascular-Other
MUE 1

This is a primary code that can be used with these additional add-on codes.

36907 CPT Add On MPFS Status: Active Code APC N ASC N1 Transluminal balloon angioplasty, central dialysis segment, performed through dialysis circuit, including all imaging and radiological supervision and interpretation required to perform the angioplasty (List separately in addition to code for primary procedure)
36908 CPT Add On MPFS Status: Active Code APC N ASC N1 Transcatheter placement of intravascular stent(s), central dialysis segment, performed through dialysis circuit, including all imaging and radiological supervision and interpretation required to perform the stenting, and all angioplasty in the central dialysis segment (List separately in addition to code for primary procedure)
36909 CPT Add On MPFS Status: Active Code APC N ASC N1 Dialysis circuit permanent vascular embolization or occlusion (including main circuit or any accessory veins), endovascular, including all imaging and radiological supervision and interpretation necessary to complete the intervention (List separately in addition to code for primary procedure)
37252 Addon Code MPFS Status: Active Code APC N ASC N1 Intravascular ultrasound (noncoronary vessel) during diagnostic evaluation and/or therapeutic intervention, including radiological supervision and interpretation; initial noncoronary vessel (List separately in addition to code for primary procedure)
37253 Addon Code MPFS Status: Active Code APC N ASC N1 Intravascular ultrasound (noncoronary vessel) during diagnostic evaluation and/or therapeutic intervention, including radiological supervision and interpretation; each additional noncoronary vessel (List separately in addition to code for primary procedure)
GC This service has been performed in part by a resident under the direction of a teaching physician
22 Increased procedural services: when the work required to provide a service is substantially greater than typically required, it may be identified by adding modifier 22 to the usual procedure code. documentation must support the substantial additional work and the reason for the additional work (ie, increased intensity, time, technical difficulty of procedure, severity of patient's condition, physical and mental effort required). note: this modifier should not be appended to an e/m service.
51 Multiple procedures: when multiple procedures, other than e/m services, physical medicine and rehabilitation services or provision of supplies (eg, vaccines), are performed at the same session by the same individual, the primary procedure or service may be reported as listed. the additional procedure(s) or service(s) may be identified by appending modifier 51 to the additional procedure or service code(s). note: this modifier should not be appended to designated "add-on" codes (see appendix d).
52 Reduced services: under certain circumstances a service or procedure is partially reduced or eliminated at the discretion of the physician or other qualified health care professional. under these circumstances the service provided can be identified by its usual procedure number and the addition of modifier 52, signifying that the service is reduced. this provides a means of reporting reduced services without disturbing the identification of the basic service. note: for hospital outpatient reporting of a previously scheduled procedure/service that is partially reduced or cancelled as a result of extenuating circumstances or those that threaten the well-being of the patient prior to or after administration of anesthesia, see modifiers 73 and 74 (see modifiers approved for asc hospital outpatient use).
53 Discontinued procedure: under certain circumstances, the physician or other qualified health care professional may elect to terminate a surgical or diagnostic procedure. due to extenuating circumstances or those that threaten the well being of the patient, it may be necessary to indicate that a surgical or diagnostic procedure was started but discontinued. this circumstance may be reported by adding modifier 53 to the code reported by the individual for the discontinued procedure. note: this modifier is not used to report the elective cancellation of a procedure prior to the patient's anesthesia induction and/or surgical preparation in the operating suite. for outpatient hospital/ambulatory surgery center (asc) reporting of a previously scheduled procedure/service that is partially reduced or cancelled as a result of extenuating circumstances or those that threaten the well being of the patient prior to or after administration of anesthesia, see modifiers 73 and 74 (see modifiers approved for asc hospital outpatient use).
58 Staged or related procedure or service by the same physician or other qualified health care professional during the postoperative period: it may be necessary to indicate that the performance of a procedure or service during the postoperative period was: (a) planned or anticipated (staged); (b) more extensive than the original procedure; or (c) for therapy following a surgical procedure. this circumstance may be reported by adding modifier 58 to the staged or related procedure. note: for treatment of a problem that requires a return to the operating/procedure room (eg, unanticipated clinical condition), see modifier 78.
59 Distinct procedural service: under certain circumstances, it may be necessary to indicate that a procedure or service was distinct or independent from other non-e/m services performed on the same day. modifier 59 is used to identify procedures/services, other than e/m services, that are not normally reported together, but are appropriate under the circumstances. documentation must support a different session, different procedure or surgery, different site or organ system, separate incision/excision, separate lesion, or separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same individual. however, when another already established modifier is appropriate it should be used rather than modifier 59. only if no more descriptive modifier is available, and the use of modifier 59 best explains the circumstances, should modifier 59 be used. note: modifier 59 should not be appended to an e/m service. to report a separate and distinct e/m service with a non-e/m service performed on the same date, see modifier 25.
73 Discontinued out-patient hospital/ambulatory surgery center (asc) procedure prior to the administration of anesthesia: due to extenuating circumstances or those that threaten the well being of the patient, the physician may cancel a surgical or diagnostic procedure subsequent to the patient's surgical preparation (including sedation when provided, and being taken to the room where the procedure is to be performed), but prior to the administration of anesthesia (local, regional block(s) or general). under these circumstances, the intended service that is prepared for but cancelled can be reported by its usual procedure number and the addition of modifier 73. note: the elective cancellation of a service prior to the administration of anesthesia and/or surgical preparation of the patient should not be reported. for physician reporting of a discontinued procedure, see modifier 53.
74 Discontinued out-patient hospital/ambulatory surgery center (asc) procedure after administration of anesthesia: due to extenuating circumstances or those that threaten the well being of the patient, the physician may terminate a surgical or diagnostic procedure after the administration of anesthesia (local, regional block(s), general) or after the procedure was started (incision made, intubation started, scope inserted, etc). under these circumstances, the procedure started but terminated can be reported by its usual procedure number and the addition of modifier 74. note: the elective cancellation of a service prior to the administration of anesthesia and/or surgical preparation of the patient should not be reported. for physician reporting of a discontinued procedure, see modifier 53.
77 Repeat procedure by another physician or other qualified health care professional: it may be necessary to indicate that a basic procedure or service was repeated by another physician or other qualified health care professional subsequent to the original procedure or service. this circumstance may be reported by adding modifier 77 to the repeated procedure or service. note: this modifier should not be appended to an e/m service.
78 Unplanned return to the operating/procedure room by the same physician or other qualified health care professional following initial procedure for a related procedure during the postoperative period: it may be necessary to indicate that another procedure was performed during the postoperative period of the initial procedure (unplanned procedure following initial procedure). when this procedure is related to the first, and requires the use of an operating/procedure room, it may be reported by adding modifier 78 to the related procedure. (for repeat procedures, see modifier 76.)
79 Unrelated procedure or service by the same physician or other qualified health care professional during the postoperative period: the individual may need to indicate that the performance of a procedure or service during the postoperative period was unrelated to the original procedure. this circumstance may be reported by using modifier 79. (for repeat procedures on the same day, see modifier 76.)
AG Primary physician
AQ Physician providing a service in an unlisted health professional shortage area (hpsa)
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
CR Catastrophe/disaster related
GW Service not related to the hospice patient's terminal condition
LT Left side (used to identify procedures performed on the left side of the body)
Q6 Service furnished under a fee-for-time compensation arrangement by a substitute physician or by a substitute physical therapist furnishing outpatient physical therapy services in a health professional shortage area, a medically underserved area, or a rural area
RT Right side (used to identify procedures performed on the right side of the body)
SG Ambulatory surgical center (asc) facility service
X4 Episodic/focused services: for reporting services by clinicians who provide focused care on particular types of treatment limited to a defined period and circumstance; the patient has a problem, acute or chronic, that will be treated with surgery, radiation, or some other type of generally time-limited intervention; reporting clinician service examples include but are not limited to, the orthopedic surgeon performing a knee replacement and seeing the patient through the postoperative period
X5 Diagnostic services requested by another clinician: for reporting services by a clinician who furnishes care to the patient only as requested by another clinician or subsequent and related services requested by another clinician; this modifier is reported for patient relationships that may not be adequately captured by the above alternative categories; reporting clinician service examples include but are not limited to, the radiologist's interpretation of an imaging study requested by another clinician
XE Separate encounter, a service that is distinct because it occurred during a separate encounter
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
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2017-01-01 Added Added
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