Diana Jao, MD
NPI 1780683789 · Geriatric Medicine (Internal Medicine) Physician · San Mateo, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Diana Jao, MD is a Geriatric Medicine (Internal Medicine) Physician provider in San Mateo, CA (NPI 1780683789).
Provider details
- NPI number
- 1780683789
- Entity type
- Individual
- Primary specialty
- Geriatric Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- G068273 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 78 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 487 | 145 |
| Amlodipine Besylate | 318 | 99 |
| Metformin Hcl | 233 | 58 |
| Losartan Potassium | 187 | 69 |
| Lisinopril | 179 | 60 |
| Levothyroxine Sodium | 160 | 55 |
| Metoprolol Succinate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-07-20
- Last updated
- 2017-05-09
Frequently asked questions
- What is Diana Jao's NPI number?
- Diana Jao's National Provider Identifier (NPI) is 1780683789, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diana Jao's specialty?
- Diana Jao is listed in the NPPES registry with a primary specialty of Geriatric Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Diana Jao located?
- Diana Jao's practice location on file with NPPES is 222 W 39th Ave, San Mateo, CA 94403-4364.
- What is Diana Jao's phone number?
- The practice phone number listed in the NPPES registry for Diana Jao is (650) 573-2426.
- Does Diana Jao accept Medicare?
- Diana Jao is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Diana Jao's NPI active?
- Yes — Diana Jao's NPI (1780683789) is active in the NPPES registry as of the last update on 2017-05-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.