Psychologist | Clinical Psychology

Dr. John Willard Howell, PSY.D.

333 South Twin Oaks Valley Road, San Marcos, California, 92096-4411

About Dr. John Willard Howell

Dr. John Willard Howell is a psychologist based in San Marcos, California who is specialized in Clinical Psychology. Active license number of Dr. John Willard Howell is 25920 for Clinical Psychology in California. His current practice location is 333 South Twin Oaks Valley Road, San Marcos. Patients can contact him at 425-281-4032. Dr. John Willard Howell, PSY.D., specializes in Clinical Psychology and his NPI number (Unique professional ID assigned by NPPES) is 1740303163.

Dr. John Willard Howell is a mental health professional with highly specialized training in the diagnosis and psychological treatment of mental, behavioral and emotional illnesses, including obsessive-compulsive disorder (OCD). His main focus is on diagnosing and treating mental, emotional, and behavioral disorders. Some of the common disorders that he can treat are learning disabilities, substance abuse, depression, anxiety, and eating disorders.

Practice Information

Dr. John Willard Howell'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. John Willard Howell
Specialization Clinical Psychology
Credentials PSY.D.
Gender Male
Practice Address: 333 South Twin Oaks Valley Road,
San Marcos, CA - 92096-4411

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 Number1740303163
NPI Enumeration Date: 09 Apr, 2007
NPI Last Update On: 17 Mar, 2025

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. John Willard Howell are as mentioned below.

License NumberSpecializationStateStatus
25920Clinical Psychology CaliforniaPrimary
PY00003532Clinical Psychology WashingtonSecondary

Mailing Address

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

Dr. John Willard Howell
1270 Cleveland Ave Unit F349,
San Diego, CA - 92103-3386
Phone: 760-682-8383

Book an Appointment with Dr. John Willard Howell

To schedule an appointment, contact Dr. John Willard Howell at 333 South Twin Oaks Valley Road, San Marcos, California or call the phone number listed below.

Book an Appointment

Frequently Asked Questions

Below are some commonly asked questions about Dr. John Willard Howell:

Dr. John Willard Howell is a psychologist specializing in Clinical Psychology. He is a mental health professional with highly specialized training in the diagnosis and psychological treatment of mental, behavioral and emotional illnesses, including obsessive-compulsive disorder (OCD). His main focus is on diagnosing and treating mental, emotional, and behavioral disorders. Some of the common disorders that he can treat are learning disabilities, substance abuse, depression, anxiety, and eating disorders.

Yes, Dr. John Willard Howell 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. John Willard Howell practices at 333 South Twin Oaks Valley Road, San Marcos, California, 92096-4411.

To schedule an appointment with Dr. John Willard Howell, please contact the office at 425-281-4032.

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