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Official Description

Insertion or replacement of permanent implantable defibrillator system, with transvenous lead(s), single or dual chamber

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The procedure described by CPT® Code 33249 involves the insertion or replacement of a permanent implantable defibrillator system, which includes one or more transvenous leads. This system is designed for either a single or dual chamber configuration. The device, commonly known as an automatic implantable cardioverter-defibrillator (AICD or ICD), plays a critical role in monitoring the heart's electrical activity continuously. It is equipped to provide various therapeutic functions, including anti-tachycardia pacing (ATP) to prevent rapid and irregular heart rhythms, backup pacing to maintain a stable heart rhythm, and cardioversion, which uses a mild shock to restore a normal heart rhythm from an abnormal one. In more severe cases, the device can deliver defibrillation, a stronger shock intended to convert dangerously abnormal heart rhythms or to restore a heartbeat during cardiac arrest. The procedure requires a surgical incision in the upper chest area, where access to the cephalic, subclavian, or jugular vein is achieved. Through this access point, a sheath is inserted into the selected vein, allowing for the advancement of the AICD lead into the appropriate heart chamber under radiological guidance. The lead is carefully positioned against the chamber wall, and if a dual chamber device is indicated, a second lead is similarly placed. Following the positioning of the leads, they are tested to ensure proper functionality. Subsequently, a subcutaneous pocket is created in the left pectoral region for the pulse generator, which is then connected to the leads and tested for operational integrity before final placement and closure of the incision.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure described by CPT® Code 33249 is indicated for patients who require a permanent implantable defibrillator system due to specific cardiac conditions. These indications may include:

  • Life-threatening arrhythmias: Patients who have experienced or are at high risk for life-threatening ventricular tachycardia or ventricular fibrillation.
  • Cardiac arrest: Individuals who have had a cardiac arrest due to a ventricular arrhythmia.
  • Heart failure: Patients with heart failure who are at risk for sudden cardiac death.
  • Previous myocardial infarction: Patients who have a history of myocardial infarction and exhibit reduced left ventricular ejection fraction.

2. Procedure

The procedure for the insertion or replacement of a permanent implantable defibrillator system involves several critical steps:

  • Step 1: The physician begins by making an incision in the skin of the upper chest to access the cephalic, subclavian, or jugular vein. This incision allows for the exposure of the selected vessel.
  • Step 2: A sheath is then inserted into the chosen vein, which serves as a conduit for the AICD lead. Under radiological guidance, the AICD wire is advanced through the sheath into the appropriate heart chamber.
  • Step 3: Once the lead is positioned, it is placed against the wall of the heart chamber to ensure optimal contact for effective pacing and defibrillation. If a dual chamber device is required, a second lead is threaded into the selected chamber and positioned similarly.
  • Step 4: The leads are tested to confirm that they are functioning correctly, ensuring that both pacing and defibrillation capabilities are operational.
  • Step 5: Following successful lead testing, a second incision is made in the skin, typically in the left pectoral region, to create a subcutaneous pocket for the pulse generator.
  • Step 6: The leads are then connected to the pulse generator, which is also tested to verify its functionality. Once confirmed, the pulse generator is placed into the pocket created earlier.
  • Step 7: The pulse generator is sutured to the underlying tissue to secure it in place, and the pocket is subsequently closed to complete the procedure.

3. Post-Procedure

After the procedure, patients are typically monitored for any immediate complications and to ensure the proper functioning of the defibrillator system. Post-procedure care may include pain management, monitoring for signs of infection at the incision sites, and ensuring that the device is operating correctly. Patients may also receive instructions regarding activity restrictions and follow-up appointments for device checks and adjustments. It is essential for patients to be educated about the signs of potential complications and the importance of adhering to follow-up care to maintain the effectiveness of the implantable defibrillator system.

Short Descr INSJ/RPLCMT DEFIB W/LEAD(S)
Medium Descr INSJ/RPLCMT PERM DFB W/TRNSVNS LDS 1/DUAL CHMBR
Long Descr Insertion or replacement of permanent implantable defibrillator system, with transvenous lead(s), single or dual chamber
Status Code Active Code
Global Days 090 - Major Surgery
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) P2E - Major procedure, cardiovascular-Pacemaker insertion
MUE 1
CCS Clinical Classification 48 - Insertion, revision, replacement, removal of cardiac pacemaker or cardioverter/defibrillator

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

33225 Addon Code MPFS Status: Active Code APC N ASC N1 Physician Quality Reporting PUB 100 CPT Assistant Article Insertion of pacing electrode, cardiac venous system, for left ventricular pacing, at time of insertion of implantable defibrillator or pacemaker pulse generator (eg, for upgrade to dual chamber system) (List separately in addition to code for primary procedure)
Q0 Investigational clinical service provided in a clinical research study that is in an approved clinical research study
GC This service has been performed in part by a resident under the direction of a teaching physician
KX Requirements specified in the medical policy have been met
CR Catastrophe/disaster related
AO Alternate payment method declined by provider of service
GZ Item or service expected to be denied as not reasonable and necessary
AQ Physician providing a service in an unlisted health professional shortage area (hpsa)
KZ New coverage not implemented by managed care
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.
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
AA Anesthesia services performed personally by anesthesiologist
P4 A patient with severe systemic disease that is a constant threat to life
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.
24 Unrelated evaluation and management service by the same physician or other qualified health care professional during a postoperative period: the physician or other qualified health care professional may need to indicate that an evaluation and management service was performed during a postoperative period for a reason(s) unrelated to the original procedure. this circumstance may be reported by adding modifier 24 to the appropriate level of 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).
54 Surgical care only: when 1 physician or other qualified health care professional performs a surgical procedure and another provides preoperative and/or postoperative management, surgical services may be identified by adding modifier 54 to the usual procedure number.
57 Decision for surgery: an evaluation and management service that resulted in the initial decision to perform the surgery may be identified by adding modifier 57 to the appropriate level of e/m service.
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.
62 Two surgeons: when 2 surgeons work together as primary surgeons performing distinct part(s) of a procedure, each surgeon should report his/her distinct operative work by adding modifier 62 to the procedure code and any associated add-on code(s) for that procedure as long as both surgeons continue to work together as primary surgeons. each surgeon should report the co-surgery once using the same procedure code. if additional procedure(s) (including add-on procedure(s) are performed during the same surgical session, separate code(s) may also be reported with modifier 62 added. note: if a co-surgeon acts as an assistant in the performance of additional procedure(s), other than those reported with the modifier 62, during the same surgical session, those services may be reported using separate procedure code(s) with modifier 80 or modifier 82 added, as appropriate.
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.
76 Repeat procedure or service by same physician or other qualified health care professional: it may be necessary to indicate that a procedure or service was repeated by the same physician or other qualified health care professional subsequent to the original procedure or service. this circumstance may be reported by adding modifier 76 to the repeated procedure or service. note: this modifier should not be appended to an e/m service.
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.)
80 Assistant surgeon: surgical assistant services may be identified by adding modifier 80 to the usual procedure number(s).
82 Assistant surgeon (when qualified resident surgeon not available): the unavailability of a qualified resident surgeon is a prerequisite for use of modifier 82 appended to the usual procedure code number(s).
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
CC Procedure code change (use 'cc' when the procedure code submitted was changed either for administrative reasons or because an incorrect code was filed)
CG Policy criteria applied
ET Emergency services
GA Waiver of liability statement issued as required by payer policy, individual case
GV Attending physician not employed or paid under arrangement by the patient's hospice provider
GW Service not related to the hospice patient's terminal condition
GY Item or service statutorily excluded, does not meet the definition of any medicare benefit or, for non-medicare insurers, is not a contract benefit
LT Left side (used to identify procedures performed on the left side of the body)
PD Diagnostic or related non diagnostic item or service provided in a wholly owned or operated entity to a patient who is admitted as an inpatient within 3 days
Q1 Routine clinical service provided in a clinical research study that is in an approved clinical research study
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)
SC Medically necessary service or supply
SG Ambulatory surgical center (asc) facility service
TC Technical component; under certain circumstances, a charge may be made for the technical component alone; under those circumstances the technical component charge is identified by adding modifier 'tc' to the usual procedure number; technical component charges are institutional charges and not billed separately by physicians; however, portable x-ray suppliers only bill for technical component and should utilize modifier tc; the charge data from portable x-ray suppliers will then be used to build customary and prevailing profiles
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
XE Separate encounter, a service that is distinct because it occurred during a separate encounter
XP Separate practitioner, a service that is distinct because it was performed by a different practitioner
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
Date
Action
Notes
2017-01-01 Changed Moderate (Conscious) Sedation flag removed. See new Moderate Sedation category.
2015-01-01 Changed Description Changed
2012-01-01 Changed Description Changed
1994-01-01 Added First appearance in code book in 1994.
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