William D. Welsh, D.O.
Geriatric Medicine (Internal Medicine) Physician · Whittier, CA
William D. Welsh, D.O. is a geriatric medicine (internal medicine) physician with a practice address in Whittier, California, and NPI 1568401255, issued on Jun 6, 2006. Check the license (California 20A4272, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William D. Welsh
- Credential
- D.O.
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- 20A4272 CA
Self-reported in NPPES; status is on the state search - Practice location
- 7624 Painter Ave, Whittier, CA 90602
- Phone
- (562) 945-9333
- Enumerated
- Jun 6, 2006
- Record last updated
- Sep 1, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (562) 945-8533
- Medicare enrollment
- Enrolled (PECOS I20090812000647); accepts Medicare assignment
- Medical or professional school
- Des Moines University Of Osteopathic Medicine And Health Sciences, 1976
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 532 in California → Look up another NPI →
Also registered at 7624 Painter Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lowryn De Castro, FNPFamily Medicine Physician1497098768
- Dennis Gowans, PHDClinical Psychologist1043314404
- Esther Herrera, FNP-CFamily Nurse Practitioner1700523990
- Michael Maguire, D.O.Geriatric Medicine (Family Medicine) Physician1881633063
- Alma Smith, MFTIMarriage & Family Therapist1760627608
Verify William D. Welsh in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A4272Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.4 times the Medicare Part D claims of the average geriatric medicine (internal medicine) physician in 2024
18,661 Medicare Part D claims for 982 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims. 389 claims were for opioids.
Most prescribed
- Atorvastatin Calcium1,078 claims
- Amlodipine Besylate829 claims
- Losartan Potassium790 claims
- Levothyroxine Sodium591 claims
- Rosuvastatin Calcium565 claims
- Metoprolol Succinate444 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): 11.8 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: $1,615.68
79 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 1,004 providers of this specialty with any payment received $1,720.82 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
- Maguire And Welsh Medical GroupWhittier, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William D. Welsh among 532 geriatric medicine (internal medicine) physician records in California
William D. Welsh, D.O. is one of 532 geriatric medicine (internal medicine) physician records with a practice address in California. 77% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 46% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 51% of these records are
- Graduated1976 · median 1999 among the 271 with a school on file
- Record last updated2009 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in California
There are 532 geriatric medicine (internal medicine) physician records in California.
All 532 in California → Every provider in Whittier → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Vijay Dhawan, M.D.Montebello, CA 906401760426415
- Prode Pascual, M.DNorwalk, CA 906501558454595
- Elaine Deemer, DOTorrance, CA 905051649856162
- Marcil Mamita, MDTorrance, CA 905051962412718
- Tzong-Yueh Hwang, M.D.Artesia, CA 907011851325211
- Abriella Demanes, MDTorrance, CA 905021669036695
- Mailee Hess, MDTorrance, CA 905021396011565
- Christopher Mayorga, DOTorrance, CA 905021003445669
Common questions
What is William D. Welsh, D.O.'s NPI number?
William D. Welsh, D.O.'s National Provider Identifier (NPI) is 1568401255, issued on Jun 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William D. Welsh, D.O. located?
The NPPES record lists a practice address at 7624 Painter Ave, Whittier, CA, 90602. Phone: (562) 945-9333. Providers update this record themselves, so call before visiting.
How can I verify William D. Welsh, D.O.'s license?
NPPES lists California license number 20A4272, 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 D. Welsh, D.O. prescribe under Medicare Part D?
In 2024, William D. Welsh, D.O. had 18,661 Medicare Part D claims for 982 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. Part D covers Medicare prescriptions only.
What is William D. Welsh, D.O.'s MIPS final score?
The 2023 MIPS final score is 11.8 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.