Richard A. Williams, M.D.
Specialist · San Dimas, CA
Richard A. Williams, M.D. is a specialist with a practice address in San Dimas, California, and NPI 1467457390, issued on Jun 16, 2005. Check the license (California A40188, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Richard A. Williams
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- A40188 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1334 W Covina Blvd, San Dimas, CA 91773
- Phone
- (909) 599-8677
- Enumerated
- Jun 16, 2005
- Record last updated
- Nov 8, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (909) 592-0999
- Medicare enrollment
- Enrolled (PECOS I20040320000515); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest specialist records → All 5,749 in California → Look up another NPI →
Also registered at 1334 W Covina Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Richard A. Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license A40188Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
47% fewer Medicare Part D claims than the average specialist in 2024
728 Medicare Part D claims for 195 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. 12 claims were for opioids.
Most prescribed
- Estradiol259 claims
- Progesterone45 claims
- Estring43 claims
- Medroxyprogesterone Acetate34 claims
- Triamcinolone Acetonide26 claims
- Nitrofurantoin Mono-Macro17 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: $123.58
8 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 5,844 providers of this specialty with any payment received $4,760.79 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.
Richard A. Williams among 5,749 specialist records in California
Richard A. Williams, M.D. is one of 5,749 specialist records with a practice address in California. 30% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 93% newer
- In a Medicare fileYes · 30% of these records are
- In the CMS Doctors and Clinicians fileYes · 19% of these records are
- Graduated1980 · median 1989 among the 1,075 with a school on file
- Record last updated2011 · 77% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Specialist providers in California
There are 5,749 specialist records in California.
All 5,749 in California → Every provider in San Dimas → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Cindy BaldelomarSan Dimas, CA 917731629936034
- Syed Rizvi, M.D.San Dimas, CA 917731659395754
- Rebecca Tkach, HHP,CST,LMTSan Dimas, CA 917731487714143
- Zuhair Yahya, M.DSan Dimas, CA 917731477514057
- Theodor Serban, RPTSan Gabriel, CA 917751386843282
- Shiela WolfordSan Gabriel, CA 917751871962530
- Jennifer Banh, B.A.Rosemead, CA 917701962674242
- Damiano CentolaRosemead, CA 917701477941169
Common questions
What is Richard A. Williams, M.D.'s NPI number?
Richard A. Williams, M.D.'s National Provider Identifier (NPI) is 1467457390, issued on Jun 16, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Richard A. Williams, M.D. located?
The NPPES record lists a practice address at 1334 W Covina Blvd, San Dimas, CA, 91773. Phone: (909) 599-8677. Providers update this record themselves, so call before visiting.
How can I verify Richard A. Williams, M.D.'s license?
NPPES lists California license number A40188, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Richard A. Williams, M.D. prescribe under Medicare Part D?
In 2024, Richard A. Williams, M.D. had 728 Medicare Part D claims for 195 beneficiaries; the average among specialist prescribers was 1,380. 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.