About Matthew Diamond
Focus areas
Adolescent / Teen Issues
Depression
Stress
Anxiety
Obsessive Compulsive Disorder (OCD)
Therapy
Cognitive Therapy
Psychology Consultation
Clientele seen
Children (<13)
Adults (25-64)
Couples
Teenagers (13-17)
Seniors (65+)
Families
Young adults (18-24)
Individuals
Treatment approaches
Coaching
EMDR
Cognitive Behavioral (CBT)
Emotionally Focused
Dialectical (DBT)
Family / Marital
Identity
Gender
MaleLanguages spoken
English
Getting to know Matthew Diamond
Matthew Diamond is a licensed therapist in New York and Connecticut. He earned his undergraduate degree in Psychology and Sociology, magna cum laude, from Clark University and his Master of Science in Social Work from Columbia University, where he received departmental honors and completed postgraduate training at NewYork-Presbyterian–Columbia University New York State Psychiatric Institute.
Matthew works with high-functioning children, adults, couples, and families navigating concerns including depression, anxiety, ADHD, relationship challenges, career and academic stress, PTSD, self-harm, anger, autism spectrum disorders, and social difficulties. He uses evidence-based and insight-oriented approaches, offering both solution-focused and longer-term therapy to help clients create meaningful change.
Matthew specializes in Cognitive Behavioral Therapy (CBT), Dialectical Behavior Therapy (DBT), Motivational Interviewing (MI), coaching, and Reiki, a meditative practice supporting relaxation and stress reduction. He helps clients build practical skills in mindfulness, emotional regulation, distress tolerance, and interpersonal effectiveness while exploring deeper patterns that support lasting growth.
Matthew provides assessments and individualized treatment plans tailored to each client’s needs. He creates a collaborative, compassionate environment where clients feel respected, understood, and empowered to develop resilience and move toward their goals.
Matthew utilizes a biopsychosocial approach, considering biological, psychological, and social factors that influence overall well-being. His practice is grounded in empathy, validation, and evidence-based care designed to support positive outcomes.
Matthew is a member of the National Association of Cognitive Behavioral Therapists, the American Psychological Association, and the National Association of Social Workers.
What is your typical process for working with clients?
I offer a complimentary 15-minute phone consultation to discuss your concerns, answer any questions regarding the treatment process, and ensure that my expertise aligns with the issues you would like to address. My goal is to help you find the most appropriate path forward, whether with me or another member of our team.
Is this doctor in your insurance network?
Enter your insurance carrier and plan
choose insurance
In-network insurances
Aetna
BlueCross BlueShield
Cigna
Emblem Health
UnitedHealthcare
UnitedHealthcare Oxford
Don’t see your insurance?
It’s common for mental health providers to be out-of-network. Many insurance plans offer out-of-network coverage, so you may get partially reimbursed. Learn more
Out-of-pocket fees and assistance
- Sliding scale: Offers lower out-of-pocket fees on an individual basis, typically based on your ability to pay
- Files your insurance claim: You pay the session fee upfront and the provider files the claim for you, so you can get reimbursed directly without worrying about the paperwork
- Charges post-reimbursement amount: This provider will only charge you for the amount you pay after you get reimbursed from your insurance plan, so you don’t need to pay the session fee upfront
More information on payments and coverage
Greenwich Psychology Group serves high functioning clients of all ages from children, adolescents, adults, parents to executives. We submit out-of-network claims and accept assignment on benefits, so you will not have to wait for reimbursement. Our billing specialists can help you understand your plan, deductibles, and coverage of your healthcare policy.
Office location
Matthew Diamond, LCSW also offers online video visits for patients
Education and background
Practice names
Education and training
- Columbia University, Master's in Social Work
- Clark University (Bachelor's)
Professional memberships
- American Psychological Association
- National Association of Social Workers
NPI number
1275296618
How soon can I make an appointment with Matthew Diamond?
Generally, Matthew Diamond has appointments available on Zocdoc within 1 week. You can see Matthew Diamond's earliest availability on Zocdoc and make an appointment online.
Is Matthew Diamond accepting new patients?
Matthew Diamond generally accepts new patients on Zocdoc. You can see Matthew Diamond's earliest availability on Zocdoc and schedule an appointment online.
Does Matthew Diamond accept my insurance?
Choose your insurance plan to verify if Matthew Diamond is in-network.
Can I make an appointment with Matthew Diamond online?
Yes, you can make an appointment online with Matthew Diamond using Zocdoc. It’s simple, secure, and free.
What practice does Matthew Diamond work with?
Matthew Diamond works with Greenwich Psychology Group.
Where is Matthew Diamond's office located?
Matthew Diamond has 2 office locations, including in Greenwich and New York, view full addresses on Matthew Diamond's profile.
What are common reasons for patients to see Matthew Diamond?
Matthew Diamond frequently sees patients for Anxiety, Depression, Psychotherapy, Psychotherapy Intake / Initial Visit, and Therapy. You can see other visit reasons for Matthew Diamond on their profile.
What languages does Matthew Diamond speak?
Matthew Diamond speaks English.