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Official Description

Arterial catheterization or cannulation for sampling, monitoring or transfusion (separate procedure); percutaneous

© Copyright 2026 American Medical Association. All rights reserved.

Common Language Description

Arterial catheterization or cannulation is a medical procedure that involves the insertion of a catheter into an artery for various purposes, including sampling, monitoring, or transfusion of blood. This procedure is essential in clinical settings for obtaining arterial blood samples, which are crucial for blood gas analysis, monitoring blood pressure in critically ill patients, and facilitating blood transfusions. The radial artery is the most frequently used site for this procedure due to its accessibility and ease of use; however, alternative sites such as the axillary and femoral arteries may also be utilized depending on the clinical scenario and patient condition. The process begins with the selection of the appropriate insertion site, followed by the preparation of the skin to ensure a sterile environment. A local anesthetic is administered to minimize discomfort during the procedure. The Seldinger technique is commonly employed, which involves puncturing the skin and the artery with a needle. In some cases, a cutdown technique may be used, where an incision is made over the artery to expose it before puncturing. After the initial puncture, a guidewire is inserted through the needle and advanced into the artery, allowing for the placement of an introducer sheath and dilator. Once the catheter is positioned correctly within the artery, its placement may be verified through imaging techniques, if necessary. Finally, the catheter or cannula is secured in place with tape, and a dressing is applied to protect the insertion site. This procedure is coded using CPT® Code 36620 for percutaneous insertion, while CPT® Code 36625 is designated for the cutdown approach.

© Copyright 2026 Coding Ahead. All rights reserved.

1. Indications

Arterial catheterization or cannulation is performed for several specific indications, which include:

  • Sampling This procedure is utilized to obtain arterial blood samples for various analyses, including blood gas monitoring, which is critical for assessing a patient's respiratory and metabolic status.
  • Monitoring It is employed for continuous blood pressure monitoring, particularly in critically ill patients or those undergoing major surgical procedures, allowing for real-time assessment of hemodynamic status.
  • Transfusion Arterial catheterization may also be indicated for the transfusion of blood products, ensuring that patients receive necessary blood components efficiently and effectively.

2. Procedure

The procedure for arterial catheterization or cannulation involves several detailed steps, which are as follows:

  • Step 1: Site Selection The clinician selects the appropriate site for catheterization, typically the radial artery, but may also consider the axillary or femoral arteries based on the patient's condition and accessibility.
  • Step 2: Skin Preparation The selected site is then prepared for sterile entry. This involves cleaning the skin with antiseptic solutions to minimize the risk of infection during the procedure.
  • Step 3: Anesthesia Administration A local anesthetic is injected at the site to ensure patient comfort and reduce pain during the insertion of the catheter.
  • Step 4: Needle Puncture Using the Seldinger technique, the clinician punctures the skin and the artery with a needle. If a cutdown approach is used, an incision is made over the artery to expose it before proceeding with the needle puncture.
  • Step 5: Guidewire Insertion After the artery is punctured, a guidewire is inserted through the needle and advanced several centimeters into the artery, providing a pathway for the catheter.
  • Step 6: Introducer Sheath Placement An introducer sheath and dilator are then advanced over the guidewire into the artery. Once in place, the guidewire and dilator are removed, leaving the introducer sheath in situ.
  • Step 7: Catheter Advancement The arterial line is advanced through the introducer sheath and into the artery, ensuring proper placement for the intended use.
  • Step 8: Placement Verification The placement of the catheter may be checked as needed by obtaining separately reportable radiographs to confirm correct positioning within the artery.
  • Step 9: Securing the Catheter Finally, the catheter or cannula is secured with tape, and a sterile dressing is applied over the insertion site to protect it and maintain sterility.

3. Post-Procedure

After the arterial catheterization or cannulation procedure, appropriate post-procedure care is essential. The insertion site should be monitored for any signs of complications, such as bleeding, infection, or thrombosis. The catheter should be regularly assessed for patency and proper function. Patients may require ongoing monitoring of vital signs and blood gas levels, depending on the reason for the catheterization. It is also important to provide patient education regarding the care of the insertion site and to inform them of any signs or symptoms that should prompt immediate medical attention.

Short Descr INSERTION CATHETER ARTERY
Medium Descr ARTL CATHJ/CANNULJ MNTR/TRANSFUSION SPX PRQ
Long Descr Arterial catheterization or cannulation for sampling, monitoring or transfusion (separate procedure); percutaneous
Status Code Active Code
Global Days 000 - Endoscopic or Minor Procedure
PC/TC Indicator (26, TC) 0 - Physician Service Code
Multiple Procedures (51) 0 - No 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) 0 - Co-surgeons not permitted for this procedure.
Team Surgery (66) 0 - Team surgeons not permitted for this procedure.
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator Items and Services Packaged into APC Rates
ASC Payment Indicator Packaged service/item; no separate payment made.
Type of Service (TOS) 2 - Surgery
Berenson-Eggers TOS (BETOS) P2F - Major procedure, cardiovascular-Other
MUE 3
CCS Clinical Classification 54 - Other vascular catheterization, not heart
GC This service has been performed in part by a resident under the direction of a teaching physician
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.
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
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
LT Left side (used to identify procedures performed on the left side of the body)
RT Right side (used to identify procedures performed on the right side of the body)
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
AQ Physician providing a service in an unlisted health professional shortage area (hpsa)
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
CR Catastrophe/disaster related
XE Separate encounter, a service that is distinct because it occurred during a separate encounter
Q1 Routine clinical service provided in a clinical research study that is in an approved clinical research study
Q0 Investigational clinical service provided in a clinical research study that is in an approved clinical research study
XP Separate practitioner, a service that is distinct because it was performed by a different practitioner
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.)
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
QY Medical direction of one certified registered nurse anesthetist (crna) by an anesthesiologist
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).
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).
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.
GW Service not related to the hospice patient's terminal condition
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.
AG Primary physician
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
X3 Episodic/broad services: for reporting services by clinicians who have broad responsibility for the comprehensive needs of the patient that is limited to a defined period and circumstance such as a hospitalization; reporting clinician service examples include but are not limited to the hospitalist's services rendered providing comprehensive and general care to a patient while admitted to the hospital
FS Split (or shared) evaluation and management visit
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.
25 Significant, separately identifiable evaluation and management service by the same physician or other qualified health care professional on the same day of the procedure or other service: it may be necessary to indicate that on the day a procedure or service identified by a cpt code was performed, the patient's condition required a significant, separately identifiable e/m service above and beyond the other service provided or beyond the usual preoperative and postoperative care associated with the procedure that was performed. a significant, separately identifiable e/m service is defined or substantiated by documentation that satisfies the relevant criteria for the respective e/m service to be reported (see evaluation and management services guidelines for instructions on determining level of e/m service). the e/m service may be prompted by the symptom or condition for which the procedure and/or service was provided. as such, different diagnoses are not required for reporting of the e/m services on the same date. this circumstance may be reported by adding modifier 25 to the appropriate level of e/m service. note: this modifier is not used to report an e/m service that resulted in a decision to perform surgery. see modifier 57 for significant, separately identifiable non-e/m services, see modifier 59.
26 Professional component: certain procedures are a combination of a physician or other qualified health care professional component and a technical component. when the physician or other qualified health care professional component is reported separately, the service may be identified by adding modifier 26 to the usual procedure number.
27 Multiple outpatient hospital e/m encounters on the same date: for hospital outpatient reporting purposes, utilization of hospital resources related to separate and distinct e/m encounters performed in multiple outpatient hospital settings on the same date may be reported by adding modifier 27 to each appropriate level outpatient and/or emergency department e/m code(s). this modifier provides a means of reporting circumstances involving evaluation and management services provided by physician(s) in more than one (multiple) outpatient hospital setting(s) (eg, hospital emergency department, clinic). note: this modifier is not to be used for physician reporting of multiple e/m services performed by the same physician on the same date. for physician reporting of all outpatient evaluation and management services provided by the same physician on the same date and performed in multiple outpatient setting(s) (eg, hospital emergency department, clinic), see evaluation and management, emergency department, or preventive medicine services codes.
50 Bilateral procedure: unless otherwise identified in the listings, bilateral procedures that are performed at the same session, should be identified by adding modifier 50 to the appropriate 5 digit code. 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).
56 Preoperative management only: when 1 physician or other qualified health care professional performed the preoperative care and evaluation and another performed the surgical procedure, the preoperative component may be identified by adding modifier 56 to the usual procedure number.
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.
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.)
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).
99 Multiple modifiers: under certain circumstances 2 or more modifiers may be necessary to completely delineate a service. in such situations modifier 99 should be added to the basic procedure, and other applicable modifiers may be listed as part of the description of the service.
AF Specialty physician
AI Principal physician of record
AK Non participating physician
AM Physician, team member service
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
FP Service provided as part of family planning program
FT Unrelated evaluation and management (e/m) visit on the same day as another e/m visit or during a global procedure (preoperative, postoperative period, or on the same day as the procedure, as applicable). (report when an e/m visit is furnished within the global period but is unrelated, or when one or more additional e/m visits furnished on the same day are unrelated)
GV Attending physician not employed or paid under arrangement by the patient's hospice provider
GX Notice of liability issued, voluntary under payer policy
GZ Item or service expected to be denied as not reasonable and necessary
KX Requirements specified in the medical policy have been met
P3 A patient with severe systemic disease
P4 A patient with severe systemic disease that is a constant threat to life
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
Q3 Live kidney donor surgery and related services
Q5 Service furnished under a reciprocal billing 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
QJ Services/items provided to a prisoner or patient in state or local custody, however the state or local government, as applicable, meets the requirements in 42 cfr 411.4 (b)
QX Crna service: with medical direction by a physician
RI Ramus intermedius coronary artery
SA Nurse practitioner rendering service in collaboration with a physician
ST Related to trauma or injury
TR School-based individualized education program (iep) services provided outside the public school district responsible for the student
U1 Medicaid level of care 1, as defined by each state
UD Medicaid level of care 13, as defined by each state
X2 Continuous/focused services: for reporting services by clinicians whose expertise is needed for the ongoing management of a chronic disease or a condition that needs to be managed and followed with no planned endpoint to the relationship; reporting clinician service examples include but are not limited to: a rheumatologist taking care of the patient's rheumatoid arthritis longitudinally but not providing general primary care services
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2011-01-01 Changed Short description changed.
Pre-1990 Added Code added.
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