Use-as-is is commonly seen as one disposition on the NC form, and that category would apply when expired product is deemed usable. To separate non-conforming and defective data in your trend charts, tally the disposition codes. You may still want to monitor trends of expired or nearly expired product, even when it is ultimately used-as-is, because better control over shelf life is appropriate continual improvement.
Another possibility for nearly-expired product is to retest and/or recertify product with an extended expiration date. Maybe your NC form has a disposition checkbox for rework (I propose that retest or recertify is a form of rework). This is not the same as the first scenario, because the firm is taking an action (or making a decision and taking a risk) to make non-conforming product usable. Different industries have precise definitions when product is repaired versus remanufactured versus reworked. I won't get into those definitions here. I use the term rework in the generic inclusive sense.