Board-certified in both Pediatrics and Adolescent Medicine, Karen S. Loper, MD, graduated from the UC San Diego School of Medicine in 1991 under California license G76438 and completed pediatrics residency at Harbor-UCLA Medical Center in 1994. The Hillcrest adolescent medicine practice at 550 Washington St Suite 331 inside Physicians Health Institute concentrates on ages ten through twenty-six, covering puberty, contraception counseling, mood disorders, disordered eating screening, and sports physicals, with behavioral health referrals routed to practices like Anxiety Therapy SD. Hospital affiliations include Rady Children's Hospital San Diego, Sharp Mary Birch Hospital for Women and Newborns, and UC San Diego Health Hillcrest, supporting inpatient consultation continuity for complex adolescent admissions. Bilingual English and Spanish visits are standard, which matters for a panel that runs heavy on confidential teen conversations about sexual health, gender identity, and substance use screening. Younger siblings and newborns in the same family units are routed to general pediatric colleagues such as Nicole M. Hibbs, MD - Children's Healthcare Medical Group while adolescent patients stay on this panel. The most clinically demanding work handled here is managing adolescent depression, anxiety, and disordered eating with concurrent medication management, family therapy coordination, and confidentiality boundaries that shift legally when patients cross the age-of-consent threshold on the way to eighteen.