Dr. Katherine Flagg, PHD

Clinical Psychology •  Female
Dr. Flagg
Accepting new patients
124 Harvard St Brookline, MA 02446

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(781) 740-4847

Dr. Katherine Flagg, PHD is a Clinical Psychologist in Brookline, MA. She is accepting new patients. Be sure to call ahead with Dr. Flagg to book an appointment.

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Dr. Flagg accepts

Accepted insurance can change. Please double-check when making an appointment.

(781) 740-4847

Dr. Flagg accepts the following insurance:

National (BlueCard) PPO
Blue Cross Blue Shield
Blue Card PPO
Blue Cross Blue Shield of Louisiana
BlueConnect HMO
Blue Cross Blue Shield of Massachusetts
Blue with Managed Care Behavioral Health HMO
Preferred Blue PPO
Harvard Pilgrim Health Care
Harvard Pilgrim Health Care PPO
MultiPlan PPO
PHCS Network PPO

Background Check

No malpractice claims found for Massachusetts
No disciplinary actions found for the years we collect data
No board actions found for the years we collect data
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Experience Check

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Dr. Flagg's conditions and procedures:

  • ADHD and-or ADD
  • Anxiety
  • Stress

About Me


Pain Management groups for patients have been developed for both locations and introductory diagnostic interviews are available in both locations.  Read more


  • Clinical Psychology
  • Adolescent Psychology
  • Neuropsychology


McLean Hosp-Harvard
Fellowship Hospital
Northeastern University
Undergraduate School
McLean Hosp/Harvard

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124 Harvard St Brookline, MA 02446
37 Derby St Ste 1 Hingham, MA 02043