NPPES file of Aug 9, 2026

Diana V. Jao, MD

Geriatric Medicine (Internal Medicine) Physician · San Mateo, CA

Diana V. Jao, MD is a geriatric medicine (internal medicine) physician with a practice address in San Mateo, California, and NPI 1780683789, issued on Jul 20, 2005. Check the license (California G068273, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1780683789
Name
Diana V. Jao
Credential
MD
Primary taxonomy
Geriatric Medicine (Internal Medicine) Physician 207RG0300X
License number
G068273 CA
Self-reported in NPPES; status is on the state search
Practice location
222 W 39TH Ave, San Mateo, CA 94403
Phone
(650) 573-2426
Enumerated
Jul 20, 2005
Record last updated
May 9, 2017 (not updated in 9 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20070405000168); accepts Medicare assignment
Medical or professional school
Hahnemann University College Of Medicine, 1988
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest geriatric medicine (internal medicine) physician records → All 532 in California → Look up another NPI →

Also registered at 222 W 39TH Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Jesse Adams, M.D.Psychiatry Physician1407143399
  2. Stacey Adelson, NPNurse Practitioner1104951797
  3. Brita Almog, MDPediatrics Physician1033402847
  4. John Anderson, MDObstetrics & Gynecology Physician1013082429
  5. Shea AndersonClinical Social Worker1689964991
  6. Zohra Ansari, MSWClinical Social Worker1326462904

Verify Diana V. Jao in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license G068273    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

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21% more Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024

5,135 Medicare Part D claims for 517 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 144 claims were for opioids.

  1. Diana Jao5,135
  2. Specialty average4,246

Most prescribed

  1. Atorvastatin Calcium487 claims
  2. Amlodipine Besylate318 claims
  3. Metformin Hcl233 claims
  4. Losartan Potassium187 claims
  5. Lisinopril179 claims
  6. Levothyroxine Sodium160 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.

Bills Medicare through one group practice

  1. County OF San MateoSan Mateo, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Diana V. Jao among 532 geriatric medicine (internal medicine) physician records in California

Diana V. Jao, MD 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 2005, is newer than 0% of them.

  • NPI issued2005 · 0% of these records are older, 93% newer
  • In a Medicare fileYes · 77% of these records are
  • In the CMS Doctors and Clinicians fileYes · 51% of these records are
  • Graduated1988 · median 1999 among the 271 with a school on file
  • Record last updated2017 · 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 Mateo → Geriatric Medicine (Internal Medicine) Physician nationwide →

The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes

  1. Shelley Salpeter, MDSan Mateo, CA 944031770688848
  2. Monique Yohanan, M.D.San Mateo, CA 944031700801560
  3. Daphne Lo, MDSan Mateo, CA 944011730470121
  4. Arthur Small, M.D.Palo Alto, CA 943061568711430
  5. Judy Bertelsen, M.D.Alameda, CA 945011881747426
  6. Julianna Marwell, M.D.Stanford, CA 943051508128075
  7. Ria Paul, M. D.Stanford, CA 943051649293176
  8. Sarah Samandary, M.D.Stanford, CA 943051841723749

Common questions

What is Diana V. Jao, MD's NPI number?

Diana V. Jao, MD's National Provider Identifier (NPI) is 1780683789, issued on Jul 20, 2005. An NPI identifies a provider in billing; it is not a license.

Where is Diana V. Jao, MD located?

The NPPES record lists a practice address at 222 W 39TH Ave, San Mateo, CA, 94403. Phone: (650) 573-2426. Providers update this record themselves, so call before visiting.

How can I verify Diana V. Jao, MD's license?

NPPES lists California license number G068273, 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 Diana V. Jao, MD prescribe under Medicare Part D?

In 2024, Diana V. Jao, MD had 5,135 Medicare Part D claims for 517 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.