William M. Gillespie, M.D.
Psychiatry Physician · Glendora, CA
William M. Gillespie, M.D. is a psychiatry physician with a practice address in Glendora, California, and NPI 1538238118, issued on Nov 7, 2006. Check the license (California G81203, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William M. Gillespie
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- G81203 CA
Self-reported in NPPES; status is on the state search - Practice location
- 510 S Grand Ave Ste 200, Glendora, CA 91741
- Phone
- (626) 914-1980
- Enumerated
- Nov 7, 2006
- Record last updated
- Feb 28, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (626) 914-1984
- Medicaid ID
- 00G812031 CA
- Medicare enrollment
- Enrolled (PECOS I20090912000161); accepts Medicare assignment
- Medical or professional school
- University Of California, Geffen School Of Medicine, 1993
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 510 S Grand Ave Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Gladelynn AdlaoRegistered Nurse1881012193
- Amber Batres, PMHNPPsychiatric/Mental Health Nurse Practitioner1861387086
- Jessica Cendejas, PSY.D.Clinical Psychologist1215261508
- Terra HartPsychiatric/Mental Health Nurse Practitioner1598251993
- Lina KassarPsychiatric/Mental Health Nurse Practitioner1538052097
- Nida Kichkla, NPPsychiatric/Mental Health Nurse Practitioner1962063859
Verify William M. Gillespie in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G81203Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
19.2 times the Medicare Part D claims of the average psychiatry physician in 2024
19,241 Medicare Part D claims for 855 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 4% of claims.
Most prescribed
- Risperidone1,606 claims
- Olanzapine1,353 claims
- Divalproex Sodium1,330 claims
- Escitalopram Oxalate1,245 claims
- Trazodone Hcl1,243 claims
- Quetiapine Fumarate1,225 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 5.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $2,914.97
178 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Pharmaceuticals, Inc. The 13,693 providers of this specialty with any payment received $4,954.93 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- William Gillespie And Associates IncGlendora, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Psychiatry Physician providers in California
There are 8,673 psychiatry physician records in California.
Other psychiatry physician records in California
- Nancy Aaen, MDNapa, CA1609816669
- Criselda Abad-Santos, M.D.Woodland Hills, CA1760461826
- Mekabiz Abaian, MDSan Bernardino, CA1891090163
- Brenda Abarca, MDTorrance, CA1407485527
- Pilar Abascal, M.D.Los Angeles, CA1730528191
- Michele Abbasi, M.D.Westlake Village, CA1093940330
- Zohaib AbbasiMartinez, CA1013392224
- Sandy Abdelkedous, MDFresno, CA1306093109
- Nancy Abdelmalak, M.D.Elk Grove, CA1912137498
- Ezzat Abdelmalek, M.DDana Point, CA1992828826
Common questions
What is William M. Gillespie, M.D.'s NPI number?
William M. Gillespie, M.D.'s National Provider Identifier (NPI) is 1538238118, issued on Nov 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William M. Gillespie, M.D. located?
The NPPES record lists a practice address at 510 S Grand Ave Ste 200, Glendora, CA, 91741. Phone: (626) 914-1980. Providers update this record themselves, so call before visiting.
How can I verify William M. Gillespie, M.D.'s license?
NPPES lists California license number G81203, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William M. Gillespie, M.D. prescribe under Medicare Part D?
In 2024, William M. Gillespie, M.D. had 19,241 Medicare Part D claims for 855 beneficiaries; the average among psychiatry physician prescribers was 1,000. Part D covers Medicare prescriptions only.
What is William M. Gillespie, M.D.'s MIPS final score?
The 2023 MIPS final score is 5.1 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.