Mental Health Therapist

Mr. Matthew Grelling, M.A. M.F.T.

1111 Grand Ave Ste J, Diamond Bar, California, 91765-4172

About Mr. Matthew Grelling

Mr. Matthew Grelling is a therapist based in Diamond Bar, California who is specialized in Mental Health Counselor. Active license number of Mr. Matthew Grelling is MFT 35675 for Mental Health Counselor in California. His current practice location is 1111 Grand Ave Ste J, Diamond Bar. Patients can reach him at 951-505-0019. Mr. Matthew Grelling is M.A. M.F.T. in Mental Health Counselor and his NPI number (Unique professional ID assigned by NPPES) is 1831239037.

Mr. Matthew Grelling is a licensed professional who helps individuals, couples, and families manage and overcome emotional, psychological, and behavioral challenges. He assess clients’ mental health conditions and develop personalized treatment plans to provide therapy for a range of mental health issues, including anxiety, depression, trauma, relationship issues, stress, grief, and life transitions.

Practice Information

Mr. Matthew Grelling speciality, credentials, practice address, contact phone number and fax are as below. Patients can call on the below given phone number for appointment.

Provider Name Mr. Matthew Grelling
Specialization Mental Health Counselor
Credentials M.A. M.F.T.
Gender Male
Practice Address: 1111 Grand Ave Ste J,
Diamond Bar, CA - 91765-4172

Professional Identification Codes

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

NPI Number1831239037
NPI Enumeration Date: 07 Feb, 2007
NPI Last Update On: 08 Jul, 2007

Medical Licenses:

Healthcare professionals can hold one or more medical licenses for different specialities in the same state or different states. Related medical licenses for Mr. Matthew Grelling are as mentioned below.

License NumberSpecializationStateStatus
MFT 35675Mental Health Counselor CaliforniaPrimary

Mailing Address

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

Mr. Matthew Grelling
732 Occidental Dr,
Claremont, CA - 91711-2632
Phone: 951-505-0019

Book an Appointment with Mr. Matthew Grelling

To schedule an appointment, contact Mr. Matthew Grelling at 1111 Grand Ave Ste J, Diamond Bar, California or call on below stated phone number.

Call to Book an Appointment

Frequently Asked Questions

Below are some commonly asked questions about Mr. Matthew Grelling:

Matthew Grelling is a therapist specializing in Mental Health Counselor. He is a licensed professional who helps individuals, couples, and families manage and overcome emotional, psychological, and behavioral challenges. He assess clients’ mental health conditions and develop personalized treatment plans to provide therapy for a range of mental health issues, including anxiety, depression, trauma, relationship issues, stress, grief, and life transitions.

Yes, Matthew Grelling is currently accepting new patients. To schedule an appointment, contact the office directly and schedule an appointment.

Matthew Grelling practices at 1111 Grand Ave Ste J, Diamond Bar, California, 91765-4172.

To schedule an appointment with Matthew Grelling, please contact the office at 951-505-0019.

Reviews & Feedback

Have you visited Mr. Matthew Grelling? Share your experience to help others looking for a Mental Health Counselor in Diamond Bar, CA.

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