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Official Description

Computed tomography guidance for, and monitoring of, parenchymal tissue ablation

© Copyright 2026 American Medical Association. All rights reserved.

Common Language Description

The CPT® Code 77013 refers to the radiological supervision and interpretation involved in computed tomography (CT) guidance specifically for parenchymal tissue ablation procedures. This code captures the essential role of CT imaging in accurately localizing the target area within the body that requires intervention. During the procedure, the area of interest is first identified and localized using CT imaging techniques, which involve the use of multiple, narrow X-ray beams that rotate around a single axis. This process generates a comprehensive series of two-dimensional images from various angles, allowing for precise visualization of the internal structures. The data collected is then digitally reconstructed into a three-dimensional image, providing detailed cross-sectional views of the target tissue. Following localization, the area is anesthetized, and a suitable needle is inserted under the guidance of the CT images. This technique is crucial for performing various interventions, such as obtaining tissue samples for biopsy, injecting therapeutic or diagnostic substances, or localizing tumors or masses for further evaluation. The surgical code associated with the procedure will report the specific intervention performed and the anatomical location involved, ensuring accurate documentation and billing for the services rendered.

© Copyright 2026 Coding Ahead. All rights reserved.

1. Indications

The CPT® Code 77013 is indicated for use in various clinical scenarios where precise imaging guidance is necessary for parenchymal tissue ablation procedures. The following conditions may warrant the use of this code:

  • Biopsy Procedures - When tissue samples need to be obtained for diagnostic purposes, CT guidance ensures accurate needle placement.
  • Therapeutic Injections - The code is applicable when injecting substances for treatment, such as steroids or other medications, into specific tissues.
  • Tumor Localization - It is used for accurately locating tumors or masses that require further investigation or intervention.

2. Procedure

The procedure associated with CPT® Code 77013 involves several critical steps to ensure successful tissue ablation under CT guidance. Each step is essential for achieving the desired outcome while minimizing risks to the patient.

  • Step 1: Localization - The first step involves the use of computed tomography to accurately identify and localize the target parenchymal tissue. This is achieved by taking multiple two-dimensional images from various angles, which are then reconstructed into a three-dimensional view, allowing for precise visualization of the area of interest.
  • Step 2: Anesthesia - Once the target area is identified, local anesthesia is administered to ensure patient comfort during the procedure. This step is crucial as it minimizes pain and discomfort associated with needle insertion.
  • Step 3: Needle Insertion - Under continuous CT guidance, the appropriate type of needle is carefully inserted into the localized area. The imaging allows the physician to monitor the needle's position in real-time, ensuring accurate placement for the intended procedure.
  • Step 4: Performing the Procedure - Depending on the clinical indication, the physician may perform various interventions, such as obtaining tissue samples for biopsy, injecting therapeutic agents, or localizing a tumor for further treatment. The CT guidance is critical throughout this process to ensure precision and safety.

3. Post-Procedure

After the completion of the procedure associated with CPT® Code 77013, patients may require specific post-procedure care to ensure proper recovery and monitor for any potential complications. It is essential to observe the patient for any immediate adverse reactions to the anesthesia or the procedure itself. Follow-up imaging may be necessary to assess the effectiveness of the intervention and to ensure that the targeted area has been adequately addressed. Patients should also receive instructions regarding activity restrictions, signs of complications to watch for, and when to schedule follow-up appointments for further evaluation or treatment.

Short Descr CT GUIDE FOR TISSUE ABLATION
Medium Descr CT GUIDANCE &MONITORING VISC TISS ABLATION
Long Descr Computed tomography guidance for, and monitoring of, parenchymal tissue ablation
Status Code Carriers Price the Code
Global Days XXX - Global Concept Does Not Apply
PC/TC Indicator (26, TC) 1 - Diagnostic Tests for Radiology Services
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) 0 - 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) 4 - Diagnostic Radiology
Berenson-Eggers TOS (BETOS) I2B - Advanced imaging - CAT/CT/CTA: other
MUE 1
CCS Clinical Classification 180 - Other CT scan
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.
GC This service has been performed in part by a resident under the direction of a teaching physician
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
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
MG The order for this service does not have applicable appropriate use criteria in the qualified clinical decision support mechanism consulted by the ordering professional
XE Separate encounter, a service that is distinct because it occurred during a separate encounter
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).
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.
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.
AQ Physician providing a service in an unlisted health professional shortage area (hpsa)
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)
MC Ordering professional is not required to consult a clinical decision support mechanism due to the significant hardship exception of electronic health record or clinical decision support mechanism vendor issues
MH Unknown if ordering professional consulted a clinical decision support mechanism for this service, related information was not provided to the furnishing professional or provider
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)
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
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
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
Date
Action
Notes
2021-01-01 Note Guidelines changed.
2008-01-01 Changed Code description changed.
2007-01-01 Added First appearance in code book in 2007.
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