Psychologist | General Psychology

Dr. Siobhan O'neil Hannes, PSY.D.

4701 Willard Ave, Suite 623, Chevy Chase, Maryland, 20815-4643

About Dr. Siobhan O'neil Hannes

Dr. Siobhan O'neil Hannes is a psychologist based in Chevy Chase, Maryland who is specialized in General Psychology. Active license number of Dr. Siobhan O'neil Hannes is PSY1000356 for General Psychology in District Of Columbia. Her current practice location is 4701 Willard Ave, Suite 623, Chevy Chase. Patients can contact her at 202-441-2585. Dr. Siobhan O'neil Hannes, PSY.D., specializes in General Psychology and her NPI number (Unique professional ID assigned by NPPES) is 1679840938.

Dr. Siobhan O'neil Hannes is specialized in psychological testing and evaluating or assessing patient's personal characteristics, such as intelligence, personality, abilities, interests, aptitudes, and neuropsychological functioning. Accordingly, she performs counseling, psychoanalysis, psychotherapy, hypnosis, biofeedback, and behavior analysis and therapy. She can diagnose and treat mental and emotional disorder or disability, alcoholism and substance abuse, disorders of habit or conduct, as well as of the psychological aspects of physical illness, accident, injury, or disability by psycheducational evaluation, therapy, remediation, and consultation.

Practice Information

Dr. Siobhan O'neil Hannes's specialty, credentials, practice address, contact phone number and fax are as below. Patients can call on the below given phone number for appointment.

Provider Name Dr. Siobhan O'neil Hannes
Specialization General Psychology
Credentials PSY.D.
Gender Female
Practice Address: 4701 Willard Ave, Suite 623
Chevy Chase, MD - 20815-4643

Professional Identification Codes

NPI number stands for National Provider Identifier which is a unique 10-digit identification number issued to healthcare providers in the United States by the Centers for Medicare and Medicaid Services (CMS). NPI details are as mentioned below.

NPI Number1679840938
NPI Enumeration Date: 30 Nov, 2011
NPI Last Update On: 30 Nov, 2011

Medical Licenses:

Healthcare professionals can hold one or more medical licenses for different specialties in the same state or different states. Related medical licenses for Dr. Siobhan O'neil Hannes are as mentioned below.

License NumberSpecializationStateStatus
PSY1000356General Psychology District Of ColumbiaPrimary

Mailing Address

Business mailing address can be used for mailing purpose only, for visiting purpose patients need to refer above mentioned Practice address.

Dr. Siobhan O'neil Hannes
4701 Willard Ave, Suite 623
Chevy Chase, MD - 20815-4643
Phone: 202-441-2585

Book an Appointment with Dr. Siobhan O'neil Hannes

To schedule an appointment, contact Dr. Siobhan O'neil Hannes at 4701 Willard Ave, Suite 623, Chevy Chase, Maryland or call the phone number listed below.

Book an Appointment

Frequently Asked Questions

Below are some commonly asked questions about Dr. Siobhan O'neil Hannes:

Dr. Siobhan O'neil Hannes is a psychologist specializing in General Psychology. She is specialized in psychological testing and evaluating or assessing patient's personal characteristics, such as intelligence, personality, abilities, interests, aptitudes, and neuropsychological functioning. Accordingly, she performs counseling, psychoanalysis, psychotherapy, hypnosis, biofeedback, and behavior analysis and therapy. She can diagnose and treat mental and emotional disorder or disability, alcoholism and substance abuse, disorders of habit or conduct, as well as of the psychological aspects of physical illness, accident, injury, or disability by psycheducational evaluation, therapy, remediation, and consultation.

Yes, Dr. Siobhan O'neil Hannes is currently accepting new patients. To schedule an appointment, contact the office directly and schedule an appointment.
*Availability may change. Please contact the office directly to ask about appointments.

Dr. Siobhan O'neil Hannes practices at 4701 Willard Ave, Suite 623, Chevy Chase, Maryland, 20815-4643.

To schedule an appointment with Dr. Siobhan O'neil Hannes, please contact the office at 202-441-2585.

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**Data of this site is collected from Medicare & Medicaid Services (CMS) and NPPES. Last updated on 14 September, 2026.