Apply the appropriate Level II HCPCS code modifier for each of the following examples. Explain your rationale for each selection. o Portable home oxygen unit o Emergency ambulance transport and extended life support o Diagnostic mammogram, left breast o Cortisone 10 mg injection, right shoulder o Nonelectric wheelchair o Intravenous catheter line, right arm o Laboratory certification, cytology specimens o Chest X-ray o Prosthetic hip replacement, left side o Electric hospital bed?