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Official Description

Stereotactic radiosurgery (particle beam, gamma ray, or linear accelerator); each additional cranial lesion, simple (List separately in addition to code for primary procedure)

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

Stereotactic radiosurgery (SRS) is a non-invasive medical procedure that utilizes advanced technology to deliver high doses of radiation precisely to targeted areas within the cranial cavity. This technique is particularly effective for treating various types of cranial lesions, including tumors and vascular malformations. The procedure can be performed using different modalities, such as particle beams, gamma rays, or linear accelerators, each offering unique advantages depending on the specific characteristics of the lesion being treated. In the context of CPT® Code 61797, this code specifically refers to the treatment of each additional simple cranial lesion following the primary procedure, which is coded separately under CPT® Code 61796. The use of stereotactic frames ensures that the patient's head remains immobile during treatment, allowing for the precise targeting of radiation beams. This meticulous approach minimizes damage to surrounding healthy tissue while maximizing the therapeutic effect on the lesion. The planning phase of the procedure involves detailed imaging studies, such as MRI or CT scans, to accurately assess the lesion's size, location, and the potential impact on adjacent structures. This comprehensive planning is crucial for determining the appropriate radiation dose and ensuring optimal treatment outcomes.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure is indicated for the treatment of various cranial lesions, particularly when they are classified as simple. The following conditions may warrant the use of stereotactic radiosurgery:

  • Primary Brain Tumors - These include tumors that originate in the brain tissue itself.
  • Metastatic Brain Lesions - Secondary tumors that have spread to the brain from other parts of the body.
  • Arteriovenous Malformations (AVMs) - Abnormal connections between arteries and veins in the brain that can lead to serious complications.
  • Acoustic Neuromas - Benign tumors on the vestibulocochlear nerve that can affect hearing and balance.
  • Meningiomas - Tumors that arise from the protective layers surrounding the brain and spinal cord.

2. Procedure

The procedure for stereotactic radiosurgery involves several critical steps to ensure accurate delivery of radiation to the targeted lesion. Each step is essential for the overall success of the treatment.

  • Step 1: Patient Preparation - The patient is positioned in a comfortable manner, and a rigid stereotactic frame is affixed to the head. This frame is crucial for maintaining the head's position throughout the procedure, ensuring that the radiation beams are directed precisely at the lesion.
  • Step 2: Imaging and Planning - A planning procedure is conducted, which includes obtaining three-dimensional MRI or CT scans of the cranial area. These images allow for detailed visualization of the lesion, surrounding structures, and assessment of potential risks associated with radiation exposure.
  • Step 3: Treatment Planning - Based on the imaging results, the treatment plan is developed. This includes determining the exact location and volume of the lesion, identifying critical surrounding structures, and calculating the appropriate radiation dose to be delivered.
  • Step 4: Treatment Delivery - If a gamma knife is utilized, the patient is placed on the gamma bed, and a helmet with multiple holes is secured to the head frame. The gamma bed then moves into the treatment area, where the helmet locks into the radiation source, and the radiation dose is delivered. If a linear accelerator is used, a computer system, along with a micro-multileaf collimator, shapes the high-energy radiation beams to match the lesion's configuration. The gantry rotates around the patient, delivering the planned radiation dose accurately.

3. Post-Procedure

After the completion of the stereotactic radiosurgery, patients are typically monitored for a short period to ensure there are no immediate complications. Post-procedure care may include instructions on managing any potential side effects, such as fatigue or mild headaches. Patients are often advised to follow up with their healthcare provider for ongoing assessment of the treatment's effectiveness and to monitor for any changes in their condition. The expected recovery time can vary, but many patients can resume normal activities shortly after the procedure, as it is minimally invasive. Long-term follow-up imaging may be necessary to evaluate the response of the lesion to the treatment.

Short Descr SRS CRAN LES SIMPLE ADDL
Medium Descr STRTCTC RADIOSURGERY EA ADDL CRANIAL LES SIMPLE
Long Descr Stereotactic radiosurgery (particle beam, gamma ray, or linear accelerator); each additional cranial lesion, simple (List separately in addition to code for primary procedure)
Status Code Active Code
Global Days ZZZ - Code Related to Another Service
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) 2 - Payment restriction for assistants at surgery does not apply 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 Code Not Recognized by OPPS when submitted on Outpatient Hospital Part B Bill Type (12x/13x)
Type of Service (TOS) 2 - Surgery
Berenson-Eggers TOS (BETOS) P1G - Major procedure - Other
MUE 4
CCS Clinical Classification 9 - Other OR therapeutic nervous system procedures

This is an add-on code that must be used in conjunction with one of these primary codes.

61796 MPFS Status: Active Code APC B CPT Assistant Article Stereotactic radiosurgery (particle beam, gamma ray, or linear accelerator); 1 simple cranial lesion
61798 MPFS Status: Active Code APC B CPT Assistant Article Stereotactic radiosurgery (particle beam, gamma ray, or linear accelerator); 1 complex cranial lesion
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.
AQ Physician providing a service in an unlisted health professional shortage area (hpsa)
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.)
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.
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.
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
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).
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.
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).
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
GZ Item or service expected to be denied as not reasonable and necessary
Q1 Routine clinical service provided in a clinical research study that is in an approved clinical research study
RT Right side (used to identify procedures performed on the right side of the body)
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
Date
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2011-01-01 Changed Short description changed.
2009-01-01 Added -
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