Psychologist | Clinical Psychology

Dr. Mark Theodore Simpson, PH.D.

119 Boone Ridge Dr, Suite 201, Johnson City, Tennessee, 37615

About Dr. Mark Theodore Simpson

Dr. Mark Theodore Simpson is a psychologist based in Johnson City, Tennessee who is specialized in Clinical Psychology. Active license number of Dr. Mark Theodore Simpson is 3205 for Clinical Psychology in Tennessee. His current practice location is 119 Boone Ridge Dr, Suite 201, Johnson City. Patients can contact him at 865-673-6741 or can fax him at 865-673-6634. Dr. Mark Theodore Simpson, PH.D., specializes in Clinical Psychology and his NPI number (Unique professional ID assigned by NPPES) is 1285757013.

Dr. Mark Theodore Simpson 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. Mark Theodore Simpson'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. Mark Theodore Simpson
Specialization Clinical Psychology
Credentials PH.D.
Gender Male
Practice Address: 119 Boone Ridge Dr, Suite 201
Johnson City, TN - 37615
Fax 865-673-6634

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 Number1285757013
NPI Enumeration Date: 08 Apr, 2007
NPI Last Update On: 25 Jun, 2018

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. Mark Theodore Simpson are as mentioned below.

License NumberSpecializationStateStatus
3205Clinical Psychology TennesseePrimary

Mailing Address

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

Dr. Mark Theodore Simpson
310 25th Ave N Ste 204,
Nashville, TN - 37203-2492
Phone: 615-385-4090
Fax: 615-385-0138

Book an Appointment with Dr. Mark Theodore Simpson

To schedule an appointment, contact Dr. Mark Theodore Simpson at 119 Boone Ridge Dr, Suite 201, Johnson City, Tennessee or call the phone number listed below.

Book an Appointment

Frequently Asked Questions

Below are some commonly asked questions about Dr. Mark Theodore Simpson:

Dr. Mark Theodore Simpson 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. Mark Theodore Simpson 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. Mark Theodore Simpson practices at 119 Boone Ridge Dr, Suite 201, Johnson City, Tennessee, 37615.

To schedule an appointment with Dr. Mark Theodore Simpson, please contact the office at 865-673-6741.

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