One of the most common questions in laboratory billing is: "Does CPT 82948 require the QW modifier?" If you bill this code from a standard physician''s office, understanding the answer is critical to getting paid.
What is CPT 82948?
CPT 82948 is defined as: Glucose; blood, reagent strip. This is the standard finger-stick blood glucose test performed in almost every primary care clinic.
The QW Modifier Rule
Yes, CPT 82948 usually requires the QW modifier. Because this is a simple, low-risk test, it is classified by the FDA and CMS as a "CLIA-Waived" test.
If your clinic operates under a Certificate of Waiver (meaning you are not a high-complexity laboratory), you MUST append Modifier QW to 82948. This tells Medicare: "We are performing a waived test, and we have the legal certificate to do so."
Exceptions to the Rule
If you are billing from an actual certified, high-complexity laboratory (not a waived clinic), you do not use the QW modifier. The QW modifier is strictly used to identify waived tests performed in waived environments.