Diagnostic Clinic of Longview has served the East Texas community since 1975, providing personalized outpatient care. The clinic includes family medicine and internal medicine services, with established patients seen by a physician, nurse practitioner, or physician assistant under the supervision of an internal medicine physician. Its Medicare Center is open to Medicare recipients with Medicare Part B or a Medicare replacement policy as primary insurance. The clinic is affiliated with Longview Regional Medical Center and CHRISTUS Good Shepherd for emergency and inpatient needs, with hospitalist partners managing inpatient care and clinic providers resuming outpatient follow-up after discharge.