TIMOTHY CHAN CHANG MD
NPI 1437594496
Urology in Stanford, CA
About Timothy Chan Chang Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
TIMOTHY CHAN CHANG MD (NPI 1437594496) is an individual urology provider in Stanford, California, licensed in California (A131727) and active in the NPI registry since May 2013. He is enrolled in Medicare PECOS, maintains a secondary practice location in Mountain View, and is a graduate of Stanford University School Of Medicine (2013).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 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
Timothy Chan Chang 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 Timothy Chang reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Stanford, CA 94305
- Reassigned Medicare billing, California enrollment
- 4,258 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 16
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.
Physician 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.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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 Timothy Chang's NPI number?
The NPI number for Timothy Chang is 1437594496. It was assigned to this individual provider in the NPPES registry on May 5, 2013.
Where is Timothy Chang located?
Timothy Chang practices at 300 Pasteur Dr, Stanford, CA 94305. The listed phone number is (650) 725-5746.
What is Timothy Chang's specialty?
The primary specialty registered for this NPI is Urology with taxonomy code 208800000X.
Is Timothy Chang enrolled in Medicare?
Yes. Timothy 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 organization bills Medicare for Timothy Chang's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Timothy Chang reassigns Medicare benefits to Stanford Health Care (Stanford, 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 Timothy Chang'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 Timothy Chang was last updated on March 13, 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.
# Timothy Chan Chang, MD · NPI 1437594496
Urology physician in Stanford, California. Individual provider, active in the CMS NPPES registry since May 5, 2013.
## Identity
- **NPI:** 1437594496 (Entity type: Individual)
- **Enumerated:** May 5, 2013
- **Primary specialty:** Urology · taxonomy 208800000X
- **State license:** A131727 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 300 PASTEUR DR, Stanford, CA 94305-2200
- **Phone:** (650) 725-5746
## 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:** Stanford Health Care (NPI 1437292927, Stanford, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Stanford University School Of Medicine, class of 2013
## Record status
- **NPPES last updated:** March 13, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1437594496) · Data from the CMS NPPES public registry.