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Low-Back Pain Imaging Studies and Modifier KX Operational Policy

We have adopted recommendations from the National Committee for Quality Assurance (NCQA) and multiple professional societies regarding reimbursement for imaging studies. 

These recommendations are reflected in our Low-Back Pain Imaging Study Quality measure that evaluates the percentage of patients ages 18 – 75 who did not have an imaging study (e.g., x-ray, MRI, CT scan) done within 28 days of the diagnosis. 

Your patient is included in this measure if the criteria below are met: 

  • The patient had an imaging study for a principal diagnosis of uncomplicated low-back pain and had at least one ED, observation or outpatient visit that didn’t result in an inpatient stay. 

OR

  • The patient received at least one osteopathic or chiropractic manipulation, physical therapy, or a telephone or online assessment visit with a principal diagnosis of uncomplicated low-back pain. 

Your patients who meet the above criteria can be excluded from this measure if they meet the additional criteria in our Self-Audit Checklist and if your records meet our Medical Record Documentation Guidelines. Refer to the Low-Back Pain Imaging Study Quality measure for more information and specific codes. 

View these resources to determine if your patient meets these criteria. If so, the claim for low-back pain imaging can be filed with the KX modifier, which means it will be paid and the patient will be excluded from the Low-Back Pain Imaging Studies measure. 

Claims for low-back pain imaging provided to Federal Employee Program (FEP) members ages 18 – 75 (excluding facility and emergency room claims) must meet these guidelines or the claims are subject to rejection. 

For more information regarding imaging for uncomplicated low-back pain, view “Use of Imaging Studies for Low-Back Pain” on the NCQA website.