William Craig Paley, D.O.
Family Medicine Physician · Ontario, CA
William Craig Paley, D.O. is a family medicine physician with a practice address in Ontario, California, and NPI 1124105754, issued on Nov 1, 2006. Check the license on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Craig Paley
- Credential
- D.O.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A4932 IL
Self-reported in NPPES; status is on the state search - Practice location
- 437 N Euclid Ave, Ontario, CA 91762
- Phone
- (909) 988-2555
- Enumerated
- Nov 1, 2006
- Record last updated
- Feb 27, 2024
- Fax
- (909) 988-4447
- Medicare enrollment
- Enrolled (PECOS I20040326000661); accepts Medicare assignment
- Medical or professional school
- Midwestern University, Chicago College Of Osteopathic Med, 1981
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 437 N Euclid Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Katherine Beltre EspinosaPhysician Assistant1811765944
- Debra Blanco, PA-CPhysician Assistant1740372366
- Vache Chakmakian, M.D.Family Medicine Physician1316974652
- Sujay DayalInternal Medicine Physician1740920966
- Hawanatu Fofanah, NPFamily Nurse Practitioner1831561448
- Gryan GarciaPsychiatric/Mental Health Nurse Practitioner1578103800
Verify William Craig Paley in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of CaliforniaCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
33% more Medicare Part D claims than the average family medicine physician in 2024
4,707 Medicare Part D claims for 551 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 179 claims were for opioids.
Most prescribed
- Amlodipine Besylate265 claims
- Atorvastatin Calcium247 claims
- Metformin Hcl236 claims
- Losartan Potassium220 claims
- Omeprazole148 claims
- Lisinopril144 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.
Industry payments in 2024: $286.28
12 payments; by number, the most common kind was food and beverage; the largest payer was Merck Sharp & Dohme LLC. The 55,478 providers of this specialty with any payment received $902.55 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
- Unicare Community Health Center, Inc.San Bernardino, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Craig Paley among 17,133 family medicine physician records in California
William Craig Paley, D.O. is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1981 · median 2005 among the 10,652 with a school on file
- Record last updated2024 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Family Medicine Physician providers in California
There are 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Ontario → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Joanne Benzor, MDOntario, CA 917621700977220
- Mauricio Bonilla, MDOntario, CA 917621801424866
- Vache Chakmakian, M.D.Ontario, CA 917621316974652
- Nicholas Ely, MDOntario, CA 917621770089757
- Rashmi Godugu, MDOntario, CA 917621669049391
- Charles Ho, M.D.Ontario, CA 917621801902051
- Chao-Ming Lin, MDOntario, CA 917621457428351
- Luis A Lomeli, M.D.Ontario, CA 917621124261896
Common questions
What is William Craig Paley, D.O.'s NPI number?
William Craig Paley, D.O.'s National Provider Identifier (NPI) is 1124105754, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Craig Paley, D.O. located?
The NPPES record lists a practice address at 437 N Euclid Ave, Ontario, CA, 91762. Phone: (909) 988-2555. Providers update this record themselves, so call before visiting.
How can I verify William Craig Paley, D.O.'s license?
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 Craig Paley, D.O. prescribe under Medicare Part D?
In 2024, William Craig Paley, D.O. had 4,707 Medicare Part D claims for 551 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
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.