Measure ID: MIPS 360|Appropriate Use|2026 Performance Year

Optimizing Patient Exposure to Ionizing Radiation: Count of Potential High Dose

Percentage of computed tomography (CT) and cardiac nuclear medicine (myocardial perfusion or infarct avid imaging) reports for all patients, regardless of age, that document a count of known previous CT (any type of CT) and cardiac nuclear medicine (myocardial perfusion or infarct avid imaging) studies that the patient has received in the 12-month period prior to the current study.

Process – High PriorityAppropriate UseImagingRadiology

Last updated: January 15, 2026

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Measure Specification

Denominator (Eligible Population)

All patients regardless of age
ANDPatient procedure during the performance period
ORPerformance Not Met: Count of previous CT and cardiac nuclear medicine (myocardial perfusion or infarct avid imaging) studies not documented in the 12-month period prior to the current study, reason not given (G9322)

Denominator Exclusions

None

Numerator

CT and cardiac nuclear medicine (myocardial perfusion or infarct avid imaging) reports that document a count of known previous CT (any type of CT) and cardiac nuclear medicine (myocardial perfusion or infarct avid imaging) studies that the patient has received in the 12-month period prior to the current study.

Submission Codes (QDCs)

✓ Performance Met
G9321Count of previous CT (any type of CT) and cardiac nuclear medicine (myocardial perfusion or infarct avid imaging) studies documented in the 12-month period prior to the current study
✗ Performance Not Met
G9322Count of previous CT and cardiac nuclear medicine (myocardial perfusion or infarct avid imaging) studies not documented in the 12-month period prior to the current study, reason not given

Denominator Exceptions

None — this measure has no denominator exceptions.

🧮MIPS Score Simulator

Estimate only — actual CMS scoring may vary based on reporting method, data completeness, and annual rule updates.

%Benchmarks vary by collection type
💡 Tip: Enter your performance rate to compare MIPS points across all collection types. The same rate can score differently depending on how you submit.
VBCA Insights

💡Why This Measure Matters

When ordering CT or cardiac nuclear medicine scans, your reports should document how many prior imaging studies the patient has had in the past year. This prevents unnecessary repeat scans and helps clinicians make informed decisions about radiation exposure. The key is ensuring your radiology team (or you as the ordering provider) documents the count of previous high-dose studies. Cumulative radiation exposure matters—tracking it reduces redundant tests and protects patients from unwarranted exposure.

📖Clinical Rationale

Increased CT use has resulted in growing rates of repeat or multiple imaging. Physicians may lack important information that could inform their decisions in ordering imaging exams that use ionizing radiation. Ordering physicians may not have access to patients’ medical imaging or radiation dose history. Due to insufficient information, physicians may unnecessarily order imaging procedures that have already been conducted.

📝Clinical Recommendations

Radiologists, medical physicists, radiologic technologists, and all supervising physicians have a responsibility to minimize radiation dose to individual patients, to staff, and to society as a whole, while maintaining the necessary diagnostic image quality. (Gunderman, et al., 2008)

📋Implementation Notes

This measure contains one strata defined by a single submission criteria. This measure produces a single performance rate. For the purposes of MIPS implementation, this procedure measure is submitted each time a procedure is performed during the performance period.

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