John Muir Health Outpatient Center, Brentwood Our Brentwood facility offers a wide array of high-quality outpatient health care services, including family practice, pediatrics, urgent care and diagnostic imaging, such as routine x-ray, digital mammography, CT, MRI, EKG, ultrasound and nuclear medicine. The Center also includes MuirLab Laboratory Services, cardiac conditioning, diabetes exercise program, pulmonary rehab, independent, multi-specialty physician offices and a surgery center.