DAVID SHI-ANN CHANG M.D.
NPI 1639330806
Internal Medicine in Stanford, CA
About David Shi-ann Chang M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DAVID SHI-ANN CHANG M.D. (NPI 1639330806) is an individual internal medicine provider in Stanford, California, licensed in California (C149397) and active in the NPI registry since June 2008. He is enrolled in Medicare PECOS, is affiliated with Sentara Careplex Hospital, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Secondary Practice Locations 2
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
David Shi-ann Chang M.d. 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 Reassignments
3Medicare enrollment records show David Chang reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Stanford, CA 94305
- Reassigned Medicare billing, California enrollment
- 4,258 clinicians in this Medicare group
Palo Alto, CA 94301
- Reassigned Medicare billing, California enrollment
- 14 clinicians in this Medicare group
Menlo Park, CA 94025
- Reassigned Medicare billing, California enrollment
- Also billed through NPI 1831268580 (California)
- 597 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.
Areas of Expertise CMS Part B claims 4
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Sentara Careplex Hospital
Acute Care Hospitals · Hampton, VAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94305 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
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.
STANFORD, CA 94305
STANFORD, CA 94305
STANFORD, CA 94305
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 David Chang's NPI number?
The NPI number for David Chang is 1639330806. It was assigned to this individual provider in the NPPES registry on June 20, 2008. The provider is also known as David S Chang.
Where is David Chang located?
David Chang practices at 300 Pasteur Dr, Stanford, CA 94305. The listed phone number is (650) 725-4000.
What is David Chang's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is David Chang enrolled in Medicare?
Yes. David Chang 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 organizations bill Medicare for David Chang's services?
According to the CMS Revalidation Reassignment List (October 2026 release), David Chang reassigns Medicare benefits to 3 organizations: Stanford Health Care (Stanford, CA), Peninsula Healthcare Connection, Inc. (Palo Alto, CA) and County Of San Mateo (Menlo Park, CA). Each 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 David Chang's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is David Chang affiliated with any hospitals?
According to CMS data, David Chang is affiliated with Sentara Careplex Hospital.
When was this NPI record last updated?
The NPPES record for David Chang was last updated on April 18, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# David Shi-Ann Chang, M.D. · NPI 1639330806
Internal Medicine physician in Stanford, California. Individual provider, active in the CMS NPPES registry since June 20, 2008.
## Identity
- **NPI:** 1639330806 (Entity type: Individual)
- **Enumerated:** June 20, 2008
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** C149397 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 PASTEUR DR, Stanford, CA 94305-2200
- **Phone:** (650) 725-4000
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Stanford Health Care (NPI 1437292927, Stanford, CA); Peninsula Healthcare Connection, Inc. (NPI 1295935799, Palo Alto, CA); County Of San Mateo (NPI 1336239052, Menlo Park, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Tufts University School Of Medicine, class of 2008
## Record status
- **NPPES last updated:** April 18, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1639330806) · Data from the CMS NPPES public registry.