"Apply the appropriate Level II HCPCS code modifier for each of the following examples.
Explain your rationale for each selection.
a. Portable home oxygen unit
b. Emergency ambulance transport and extended life support
c. Diagnostic mammogram, left breast
d. Cortisone 10 mg injection, right shoulder
e. Non-electric wheelchair
f. Intravenous catheter line (PICC), right arm
g. Laboratory certification, cytology specimens
h. Chest x-ray
i. Prosthetic hip replacement, left side
j. Electric hospital bed