Ground glass appearance is related to thickening of the alveolar wall and can be found in a number of problems.
These include pumonary edema, pulmonary fibrosis, interstitial lung disease but also with some pneumonias.
The results of the biopsy will be very helpful. You may need repeat chest x-rays or CT on a regular basis to keep an eye on this.
Can you list all your current medication, and anything that you have discontinued recently?