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Edit this profileAt a glance
- 510 S Grand Ave Ste 200, Glendora, CA 91741
About Dr. Gillespie
William M. Gillespie, M.D. is a healthcare provider in Glendora, CA specializing in psychiatry. William trained at University of California, Geffen School of Medicine, graduating in 1993. According to Medicare claims data, William cared for 2,312 Medicare patients across 5,415 services. The services billed most often include subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes, subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes, and subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more. This provider record is associated with NPI 1538238118.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
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
- (626) 914-1980
- Email not available
Is this your home address or personal number? Hide it
Practice Locations
510 S GRAND AVE STE 200
Glendora, CA 91741
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
Cognitive and adjustment
Eating, sleep, and somatic
- Binge-eating disorder
- Bulimia nervosa
- Illness anxiety disorder
Geriatric care
- Agitation in Dementia
Mental Health
Neurodevelopmental and behavioral
- Intellectual disability
- Autism
- Oppositional defiant disorder
Most searched conditions
Anxiety, trauma, and obsessive-compulsive
Mood disorders
Psychotic disorders
Substance-related and addictive
Addiction & Substance Use
Eating Disorders
Mood & Depression
Personality and dissociative
- Borderline personality disorder
- Dissociative disorders
- Narcissistic personality disorder
Sleep & Wakefulness
Procedures & services
Advanced treatment
- Esketamine treatment
Assessment
- Cognitive and memory screening
- Suicide and safety risk assessment
Most searched procedures
- Anxiety and depression treatment
- Cognitive behavioral therapy
- Medication management
- Psychiatric evaluation
- Telepsychiatry
Addiction care
Addiction Medicine
- Alcohol Detox and Withdrawal Management
- Dual Diagnosis Treatment
- Suboxone Treatment and MAT
Assessments
- Adult ADHD Testing
- Autism testing
- Cognitive Assessment
Brain stimulation
- Neurofeedback
- Vagus Nerve Stimulation
Consultations
Diagnostics
- Neuropsychological Testing
- Psychiatric Genetic Testing
Inpatient care
- Inpatient Psychiatric Care
Interventional psychiatry
- Spravato Treatment
Psychotherapy
Sleep Medicine
Specialized care
Therapy
Therapy and care
Procedures Most Often Billed to Medicare
5,415 services · 2,312 patients · 11 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Psychotherapy with evaluation and management visit, 30 minutes | Treatment | 90833 |
40 | Less often than most peers in Psychiatry |
| Psychiatric diagnostic evaluation with medical services | Treatment | 90792 |
15 | Less often than most peers in Psychiatry |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
2,155 | More than most peers in Psychiatry |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | Office visit | 99233 |
996 | More than most peers in Psychiatry |
| Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more | Office visit | 99308 |
612 | More often than most peers in Psychiatry |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
599 | More than most peers in Psychiatry |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | Office visit | 99222 |
570 | More than most peers in Psychiatry |
| Hospital discharge day management, 30 minutes or less | Office visit | 99238 |
321 | More than most peers in Psychiatry |
| Residence visit for established patient with straightforward medical decision making, per day, if using time, at least 15 minutes | Office visit | 99347 |
58 | As often as other peers in Psychiatry |
| Initial nursing facility care with high level of medical decision making, per day, if using time, 50 minutes or more | Office visit | 99306 |
38 | As often as other peers in Psychiatry |
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.
Related specialists at this location 3
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other psychiatrists in Glendora 6
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at University of California, Geffen School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1993 at University of California, Geffen School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Psychotherapy with evaluation and management visit, 30 minutes 8
Providers in CA who bill this service to Medicare most often.
Common questions
What does William M. Gillespie specialize in?
William M. Gillespie is a psychiatrist in Glendora, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Psychiatry”.
NPI registry
Where is William M. Gillespie located?
William M. Gillespie is listed at 510 S Grand Ave Ste 200, Glendora, CA 91741. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is William M. Gillespie's phone number?
The number on file is (626) 914-1980. Contact the office directly to confirm availability and scheduling.
NPI registry
What is William M. Gillespie's NPI number?
William M. Gillespie's National Provider Identifier is 1538238118. 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 William M. Gillespie train?
William M. Gillespie attended University of California, Geffen School of Medicine, graduating in 1993. This comes from the CMS National Downloadable File.
CMS public data
How long has William M. Gillespie been practicing?
William M. Gillespie has 33 years experience. Calculated from a graduation year of 1993, reported in the CMS National Downloadable File.
CMS public data
What does William M. Gillespie do most often?
According to Medicare billing data, William M. Gillespie provides treatments such as psychotherapy with evaluation and management visit, 30 minutes and psychiatric diagnostic evaluation with medical services, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has William M. Gillespie confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by William M. Gillespie. If this is you, claiming it is free.
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