G9638 | Final Reports Without Documentation | Description & Billing Guide

G9638 is an HCPCS code that can be used for final reports without documentation of one or more dose reduction techniques. Several reduction methods include:

  • Automated exposure control.
  • The current and voltage modification is according to the patient’s size.
  • The utilization of iterative reconstruction best practices. 

G9638 can use for one or more dose reduction techniques. For each scanner, a unique exposure control/optimization technique can include in the report using a procedure- or exam-specific macro.

Depending on the type of exam performed, a CT scan completes in various settings, with all scans utilizing appropriate dose optimization methods, automated risk assessment, and mitigation.

Adjusting the current (mA) and voltage (kV) to accommodate a variety of patient sizes (this includes methods or standardized protocols for targeted exams where the dose will match the purpose of the exam, such as the extremities or the head)

In HCPCS Code G9638, the final report without documentation requires payment services. Each scanner can have its own exposure protocol/optimization technique written into the information using a relevant exam/procedure-related macro.

The documentation policy outlines the process for ensuring that the dose optimization techniques are used appropriately per instrument and room. A simple blanket attestation statement in the report’s conclusion will suffice if that fails.

A CT image reconstruction algorithm for G9638 begins with an image assumption and continuously adjusts based on comparisons to real-time measured values. Scanners could not use iterative reconstruction before computers became widely available.

 However, recent computing advances have made this image reconstruction algorithm widely applicable.

In addition, reducing noise caused by filtered back projection without increasing radiation exposure has significantly impacted the computed tomography image reconstruction market.

CT scans for medical diagnosis can only be used when necessary and only with the lowest possible radiation dose.

Additionally, they must ensure that radiation doses to specific patients are appropriate while simultaneously considering the potential risk from radiation exposure and the diagnostic image quality that must achieve.

The dose reduction mechanisms built into imaging equipment must activate to moderate exposure while maintaining diagnostic image quality.

The applicable ACR Technical Standard requires a medical physicist to conduct regular dosimetric assessments and exposure monitoring.

G9638 Description

The patients who underwent the process of computed tomography (CT) and were at least 18 years old whose final reports included proof that one or more of the techniques.

These techniques could use to reduce the dose. In addition, the medicare service status for the G9638 code could use for reducing dose judgment. 

HCPCS code G9638 is officially described as: “Final reports without documentation of one or more dose reduction techniques (e.g., automated exposure control, adjustment of the ma and/or kv according to patient size, use of iterative reconstruction technique).”

There is no need for documentation for related technologies in the case of G9638. The final reports for these patients will evaluate to determine whether or not they satisfy the requirements listed here:

  • Automated exposure control.
  • Adjustment of the mA and kV to take into account the patient’s size.
  • Utilization of the iterative reconstruction method. 

This measure must report each time a patient undergoes a computed tomography scan throughout the performance period. This measurement contributes nothing to the diagnosis in any way, shape, or form.

Because the denominator is present, we know that the service denoted by this CPT Category I code will not be covered by any payment categories included in the Medicare Part B Physician Fee Schedule (PFS).

The denominator criteria can use to identify the target patient population. In addition, the quality-data numerator codes provided herein can use to report the quality actions permitted by the measure. The eligible encounter’s claim (s) should include all measure-specific coding. 

All CT scans could perform on patients during the performance period must be reported for this metric. This metric has nothing to do with diagnosing.

This measure expects to be submitted by qualified clinicians who provide the expert component of diagnostic imaging studies for computed tomography.

Billing Guidelines

In the case of G9638, non-covered services will not count in the population used to determine claims for the Medicare Part B program because Medicare does not pay for them. As a result, claims for that particular program will not pay out. 

This information could provide in the section that bears the heading “NOTE FOR DENOMINATOR” (PFS). These non-covered services will not count in the population used to determine claims for the Medicare Part B program because Medicare does not pay for them. 

As a result, claims for that particular program will not pay out. Patients will include in the denominator, and one of those criteria is that they must be under 18 on the day of their visit (eligible cases).

Patients must satisfy the criteria to include in the denominator, and one of those criteria is that they must be under 18 on the day of their visit (eligible cases). 

The patient must be 18 years old before the scheduled appointment to proceed with the consultation.

If the patient was more senior than or equal to 18 years old at the time of their visit, they should not include in the population of eligible patients or the denominator.

 If the visit was more significant than the patient’s age at the time, then the patient procedure should not be performed on the patient.

Confirm the patient procedure by the specifications listed in the denominator for the following criteria during the performance period. 

The total number of treatments that meet the criteria and should include in the population can use to calculate the denominator. The numerator represents the entire population in its entirety.

In the Sample Calculation found at the end of this document, we will refer to the numerator as the “Denominator,” even though we will be using the term “Numerator.”

It is the location where the Sample Calculation can find—the letter D is associated with eighty distinct mathematical operations within the sample calculation scope. Beginning with the numerator, start counting from the beginning.

If the final reports contain evidence of one or more dose reduction techniques, include this information in both the performance met, and the data completeness met categories.

Ensure that the final reports demonstrate the use of at least one of the following dose reduction techniques if the final announcements contain evidence of one or more techniques for reducing the dose. 

The terms “Data Completeness Met” and “Performance Met” serve as stand-ins for the Data Completeness Rate and the Performance Rate, respectively, in the Sample Calculation that will find at the very end of this document. To locate it, scroll down until you reach the bottom of this page.

In the Sample Calculation, the letter “a” serves as a shorthand for forty different operations. Moreover, it assumes that the final reports, which contain evidence of one or more strategies for dose reduction, are comparable to one another. 

Make it a point to check that the final reports do not in any way include evidence of dose reduction methods:

  1. Include in data completeness met and performance not completed if one or more techniques for dose reduction will not document in final reports.
  2.  Suppose final reports fail, document one or more techniques for dose reduction. If the requirements for the comprehensiveness of the data will not satisfy, the Quality Data Code report cannot transmit. It ensures that all of the procedures accounting for the numerator were reduced by ten first so that it could use in the sample calculation.


The patient can avail of reimbursement by using the criteria listed as the denominator; one can calculate the population of patients who receive treatment.

The quality actions permitted by the measure will be submitted on the claim form using the numerator quality-data codes included in this specification (s).


A patient whose age is 48 goes through the process of a CT scan. All “on-site” CT scans use dose-optimization methods tailored to the exam.

After the complete medical techniques process, documentation will not need. The final report will also not contain documentation. These techniques could include:

  • Adjusting mA and kV according to patient size
  • Iterative reconstruction

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