William Casas
Family Medicine Physician · La Verne, CA
William Casas is a family medicine physician with a practice address in La Verne, California, and NPI 1477998615, issued on May 1, 2013. Check the license (California A139442, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Casas
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A139442 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2333 Foothill Blvd Ste B, La Verne, CA 91750
- Phone
- (909) 392-6501
- Enumerated
- May 1, 2013
- Record last updated
- Feb 25, 2026
- Fax
- (909) 469-2136
- Medicaid ID
- 1477998615 CA
- Medicare enrollment
- Enrolled (PECOS I20160620002353); may accept Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 2333 Foothill Blvd Ste B
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Cecilia Cusimano Murillo, MDFamily Medicine Physician1427748326
- Michael Deanda, MDFamily Medicine Physician1750381711
- Kim Dinh, PA-CMedical Physician Assistant1871060046
- Craig Endo, M.D.Family Medicine Physician1265411730
- Tiffany Endo, D.O.Family Medicine Physician1457384257
- Jessica Gately, FNPFamily Nurse Practitioner1336900372
Verify William Casas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A139442Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
24% more Medicare Part D claims than the average family medicine physician in 2024
4,378 Medicare Part D claims for 483 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 59 claims were for opioids.
Most prescribed
- Atorvastatin Calcium348 claims
- Amlodipine Besylate220 claims
- Levothyroxine Sodium188 claims
- Losartan Potassium187 claims
- Metformin Hcl179 claims
- Lisinopril123 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: $14.73
1 payment: food and beverage; the largest payer was GlaxoSmithKline, 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
- Premier Family Medicine Associates, IncLa Verne, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Casas among 17,133 family medicine physician records in California
William Casas 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 2013, is newer than 68% of them.
- NPI issued2013 · 68% of these records are older, 29% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1996 · median 2005 among the 10,652 with a school on file
- Record last updated2026 · 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).
14 family medicine physician records list a practice address in La Verne
They are 14 of the 515 NPPES records with a practice address in La Verne, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in La Verne → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Habib Bashoura, MDLa Verne, CA 917501730170887
- Marcelo Burciaga, D.O.La Verne, CA 917501255528576
- Cecilia Cusimano Murillo, MDLa Verne, CA 917501427748326
- Michael Deanda, MDLa Verne, CA 917501750381711
- Craig Endo, M.D.La Verne, CA 917501265411730
- Tiffany Endo, D.O.La Verne, CA 917501457384257
- Alan FloresLa Verne, CA 917501124087671
- Lineth Florian, MDLa Verne, CA 917501770006009
Common questions
What is William Casas's NPI number?
William Casas's National Provider Identifier (NPI) is 1477998615, issued on May 1, 2013. An NPI identifies a provider in billing; it is not a license.
Where is William Casas located?
The NPPES record lists a practice address at 2333 Foothill Blvd Ste B, La Verne, CA, 91750. Phone: (909) 392-6501. Providers update this record themselves, so call before visiting.
How can I verify William Casas's license?
NPPES lists California license number A139442, 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 Casas prescribe under Medicare Part D?
In 2024, William Casas had 4,378 Medicare Part D claims for 483 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.