William James Deardorff
Geriatric Medicine (Internal Medicine) Physician · San Francisco, CA
William James Deardorff is a geriatric medicine (internal medicine) physician with a practice address in San Francisco, California, and NPI 1003348830, issued on Mar 30, 2017. Check the license (California A169642, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William James Deardorff
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- A169642 CA
Self-reported in NPPES; status is on the state search - Practice location
- 505 Parnassus Ave, San Francisco, CA 94143
- Phone
- (415) 406-1417
- Enumerated
- Mar 30, 2017
- Record last updated
- Jul 15, 2024
- Fax
- (415) 514-8192
- Medicare enrollment
- Enrolled (PECOS I20210702000764); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 532 in California → Look up another NPI →
Also registered at 505 Parnassus Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Alexander Aabedi, MDStudent in an Organized Health Care Education/Training Program1245971480
- Kathryn Aaronson, RN, CPNPPediatric Nurse Practitioner1992030951
- Sharon AbadaStudent in an Organized Health Care Education/Training Program1003492844
- Abul Abbas, MBBSAnatomic Pathology Physician1881652964
- Jesse Abelson, MDInternal Medicine Physician1083843817
- Rhonald AbitonaAcute Care Nurse Practitioner1164993473
Verify William James Deardorff in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A169642Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
79% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
893 Medicare Part D claims for 48 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims. 14 claims were for opioids.
Most prescribed
- Omeprazole58 claims
- Metformin Hcl55 claims
- Metformin Hcl Er51 claims
- Tamsulosin Hcl50 claims
- Allopurinol49 claims
- Lansoprazole49 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 practice group's MIPS final score for 2023 (Medicare payment program): 74.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Regents OF The University OF CaliforniaSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William James Deardorff among 532 geriatric medicine (internal medicine) physician records in California
William James Deardorff 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 2017, is newer than 87% of them.
- NPI issued2017 · 87% of these records are older, 11% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 51% of these records are
- Graduated2017 · median 1999 among the 271 with a school on file
- Record last updated2024 · 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 San Francisco → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Louise Aronson, M.D.San Francisco, CA 941431780786772
- Brittany Barba, MDSan Francisco, CA 941431972244960
- Monica ChengSan Francisco, CA 941431386107415
- Rebecca Conant, M.D.San Francisco, CA 941431083656656
- Miranda Dunlop, M.D.San Francisco, CA 941431407888738
- Todd James, MDSan Francisco, CA 941431306989223
- Anuj Kadel, M.B.B.SSan Francisco, CA 941431376284133
- Fareeha Majeed, MDSan Francisco, CA 941431134325541
Common questions
What is William James Deardorff's NPI number?
William James Deardorff's National Provider Identifier (NPI) is 1003348830, issued on Mar 30, 2017. An NPI identifies a provider in billing; it is not a license.
Where is William James Deardorff located?
The NPPES record lists a practice address at 505 Parnassus Ave, San Francisco, CA, 94143. Phone: (415) 406-1417. Providers update this record themselves, so call before visiting.
How can I verify William James Deardorff's license?
NPPES lists California license number A169642, 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 James Deardorff prescribe under Medicare Part D?
In 2024, William James Deardorff had 893 Medicare Part D claims for 48 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. Part D covers Medicare prescriptions only.
What is William James Deardorff's MIPS final score?
The 2023 MIPS final score is 74.5 of 100, reported for the practice group. 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.