Physician Profile
Nathan R. Gwilliam, MD
Unclaimed ProfileAbout Dr. Gwilliam
Nathan R. Gwilliam, MD is a healthcare provider in New Haven, CT specializing in psychiatry. Nathan trained at Baylor College of Medicine, graduating in 2012. According to Medicare claims data, the services billed most often include established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (203) 293-6258
- Email not available
Practice Locations
389 WHITNEY AVE WHITNEY OFFICE SUITES #2
New Haven, CT 06511
Conditions Commonly Evaluated or Treated
Within Psychiatry generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
- ADHD
- Anxiety
- Bipolar disorder
- Depression
- Schizophrenia
- Trauma
Anxiety, trauma, and obsessive-compulsive
- Agoraphobia
- OCD
- Panic disorder
- Social anxiety disorder
- Specific phobias
Mood disorders
- Premenstrual dysphoric disorder
- Seasonal affective disorder
Psychotic disorders
Substance-related and addictive
- Alcohol use disorder
- Opioid use disorder
Addiction & Substance Use
- Drug addiction
- Gambling Addiction
Cognitive and adjustment
Eating Disorders
- Binge eating
- Eating disorders
Eating, sleep, and somatic
- Illness anxiety disorder
Mood & Depression
Neurodevelopmental and behavioral
- Autism
- Oppositional defiant disorder
Personality and dissociative
- Borderline personality disorder
- Dissociative disorders
- Narcissistic personality disorder
Sleep & Wakefulness
Procedures & services
Most searched procedures
- Anxiety and depression treatment
- Cognitive behavioral therapy
- Medication management
- Psychiatric evaluation
- Telepsychiatry
Assessment
Addiction care
- Addiction counseling
Addiction Medicine
Assessments
Brain stimulation
- Neurofeedback
- Vagus Nerve Stimulation
Consultations
Diagnostics
Inpatient care
Interventional psychiatry
Psychotherapy
- Anger Management Counseling
- Couples counseling
- EMDR Therapy
- Exposure and Response Prevention
Sleep Medicine
Specialized care
Therapy
- Acceptance and commitment therapy
- Dialectical Behavior Therapy
- Somatic experiencing
Therapy and care
- Family therapy
- Group psychotherapy
- Supportive psychotherapy
Procedures Most Often Billed to Medicare
21 services · 14 patients · 1 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more | Office visit | 99215 |
21 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other psychiatrists at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 8
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 3
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 24 related providers in 3 groups
Other psychiatrists in New Haven 8
Same specialty, same city.
Trained at Baylor College of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 2012 at Baylor College of Medicine 8
Providers who graduated from the same medical school in the same year.
Common questions
What kind of doctor is Dr. Gwilliam?
Dr. Gwilliam is a psychiatrist in New Haven, CT. That is the designation recorded for this NPI in the federal registry, where it is listed as “Psychiatry”.
NPI registry
What is Dr. Gwilliam's address?
Dr. Gwilliam is listed at 389 Whitney Ave Whitney Office Suites #2, New Haven, CT 06511. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. Gwilliam?
The number on file is (203) 293-6258. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Gwilliam?
Dr. Gwilliam's National Provider Identifier is 1366882409. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Gwilliam train?
Dr. Gwilliam attended Baylor College of Medicine, graduating in 2012. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Gwilliam have?
Dr. Gwilliam has 14 years experience. Calculated from a graduation year of 2012, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. Gwilliam perform?
According to Medicare billing data, Dr. Gwilliam the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Gwilliam's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Gwilliam. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.