DR. DIANA V JAO MD
NPI 1780683789
Internal Medicine - Geriatric Medicine in San Mateo, CA
About Dr. Diana V Jao Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. DIANA V JAO MD (NPI 1780683789) is an individual geriatric medicine provider in San Mateo, California, licensed in California (G068273) and active in the NPI registry since July 2005. She is enrolled in Medicare PECOS and is a graduate of Hahnemann University College Of Medicine (1988).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Diana V Jao Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Diana Jao reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
San Mateo, CA 94403
- Reassigned Medicare billing, California enrollment
- Also billed through NPI 1114005105 (California)
- 19 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94403 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 6
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Diana Jao's NPI number?
The NPI number for Diana Jao is 1780683789. It was assigned to this individual provider in the NPPES registry on July 20, 2005.
Where is Diana Jao located?
Diana Jao practices at 222 W 39th Ave, San Mateo, CA 94403. The listed phone number is (650) 573-2426.
What is Diana Jao's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Geriatric Medicine, with taxonomy code 207RG0300X.
Is Diana Jao enrolled in Medicare?
Yes. Diana Jao is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Diana Jao's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Diana Jao reassigns Medicare benefits to County Of San Mateo (San Mateo, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Diana Jao's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Diana Jao was last updated on May 9, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Diana V Jao, MD · NPI 1780683789
Geriatric Medicine physician in San Mateo, California. Individual provider, active in the CMS NPPES registry since July 20, 2005.
## Identity
- **NPI:** 1780683789 (Entity type: Individual)
- **Enumerated:** July 20, 2005
- **Primary specialty:** Internal Medicine - Geriatric Medicine · taxonomy 207RG0300X
- **State license:** G068273 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 222 W 39TH AVE, San Mateo, CA 94403-4364
- **Phone:** (650) 573-2426
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** County Of San Mateo (NPI 1780753434, San Mateo, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Hahnemann University College Of Medicine, class of 1988
## Record status
- **NPPES last updated:** May 9, 2017
- **Other identifiers:** Medicare UPIN H19779 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1780683789) · Data from the CMS NPPES public registry.