Modifier 91 Fact Sheet - Novitas Solutions
Report each service on a separate line, with quantity of one and append 91 to the repeat procedure. Documentation must support the use of the modifier. Review the medically unlikely edits to ensure …
Mastering Modifiers 59, 25, and 91 in Medical Billing
Aug 16, 2025 · Modifier 91 indicates that the test is a repeat clinical diagnostic laboratory test, not a duplicate billing or clerical error. Ensure documentation clearly states why repeat testing was …
Proper Use of Modifier 91 - AAPC Knowledge Center
Oct 15, 2014 · Modifier 91 Repeat clinical diagnostic laboratory test is used to report the same lab test when performed on the same patient, on the same day, to obtain subsequent test results.
Comprehensive List of CPT Modifiers (2025) - Coding Ahead
Payment modifiers (sometimes called “pricing modifiers”) directly impact how a claim is processed. They may alter the allowed amount or indicate how the service is reimbursed (e.g., only professional …
How are Modifiers 59, 25, and 91 used in Medical Billing?
Jan 6, 2024 · Modifier 91 indicates repeated clinical lab tests on the same day for treatment management. Modifier 59 designates separate procedures performed by the same healthcare …
When is it Appropriate to Append Modifier 91 to a CPT Code?
Aug 5, 2025 · The modifier 91 is a type of billing code that is added to the medical claims with the CPT or HCPCS codes to show that a diagnostic laboratory test was performed more than once for the …
What Is Modifier 91 and When to Use It in Medical Billing?
Apr 25, 2025 · Modifier 91 is used to report repeat lab tests. These tests must be medically necessary and done on the same patient on the same day. “Use Modifier 91 when a lab test is done again on …
What are Modifiers 90, 91, and 99? A Comprehensive Guide to Modifier ...
Mar 25, 2024 · Using Modifier 91 will ensure you are correctly documenting the repetitions of a specific exercise code, which you might report along with the exercise code, clarifying the reason behind the …
How to Use Medical Billing Modifiers 59, 25, and 91 ...
Modifier 91 is reserved for repeated clinical laboratory tests performed on the same day to monitor a patient’s condition or response to treatment. It differentiates these tests from mere repetitions due to …
Modifier 59 Vs. Modifier 76 Vs. Modifier 91 Explained
Aug 18, 2025 · Applying Modifier 76 or 91 to the Wrong Service: Modifier 76 is for repeat procedures by the same provider, not lab tests. Modifier 91 is for repeat lab tests, not therapy or procedures.