Dr. Robert Won-Kee Chang, MD
- Part D claims, 2024
- 60
- Hospital affiliations
- 2
- Industry payments
- $1,277
- Medical group
- 1
- State license
- 1
- Practice address
- 1190 Veterans Blvd, Redwood City, CA 94063
- Practice phone
- Call (650) 299-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Permanente Medical Group Inc
Redwood City, California
Find Dr. Chang's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Robert Won-Kee Chang is a vascular surgeon in Redwood City, California
Dr. Chang practices at Permanente Medical Group Inc in Redwood City, California.
Dr. Chang's NPI, 1316059058, was assigned on August 31, 2006. Dr. Chang graduated from University of Southern California Keck School of Medicine in 1999. Dr. Chang holds New Hampshire license RT 1566.
- NPI
- 1316059058NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0749357127
- NPI enumeration date
- August 31, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (650) 299-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 53
- Medical school graduation
- 1999
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Robert Won-Kee Chang practices at Permanente Medical Group Inc in Redwood City, California
Dr. Chang's primary practice is Permanente Medical Group Inc, at 1190 Veterans Blvd, Redwood City, CA 94063 in San Mateo County. The practice phone is (650) 299-2000.
- Permanente Medical Group Inc1190 Veterans Blvd, Redwood City, CA 94063 · San Mateo CountyPhone(650) 299-2000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Robert Won-Kee Chang is affiliated with 3 sites of care and 1 medical group
Dr. Chang's primary practice is Permanente Medical Group Inc in Redwood City, California. Dr. Chang is also affiliated with Dartmouth Hitchcock Medical Center. The medical group on file is The Permanente Medical Group, Inc. Dmand AI also links Dr. Chang to 1 more hospital, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Robert Won-Kee Chang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chang practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Permanente Medical Group Inc | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Robert Won-Kee Chang is one of 532 vascular surgeons in California
Vascular surgery is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 2086S0129X. Dr. Chang is licensed in New Hampshire.
Specialties and state licenses
- Vascular surgery, New HampshirePrimary
Vascular surgeons near Dr. Chang
Counts of vascular surgeons with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Robert Won-Kee Chang's patients have a median age of 75
Across all payers, Dmand AI patient panel data puts Dr. Chang's median patient age at 75, with 31% women.
Dr. Chang's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 75
Patient panel by sex, all payers
- Women31%
- Men66%
Source: Dmand AI Patient Panel Data
Dr. Robert Won-Kee Chang wrote 60 Medicare Part D claims in 2024
In 2024, Dr. Chang wrote 60 Medicare Part D claims for 21 patients. 95% of them were for generic drugs. CMS names the drug for 22 of them, across 1 drug with 11 or more claims each, at $346 in total drug cost. In 2023, CMS named 26 claims across 1 drug.
Dr. Chang's Part D claims by kind of drug, 2024
- Generic57 claims95%
- Brand-name and other3 claims5%
Dr. Chang's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 262024: 2215%
Drugs named by CMS: 1 in 2024, 1 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Robert Won-Kee Chang takes part in Medicare
Dr. Chang accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Robert Won-Kee Chang received $1,277 in industry payments from 2017 to 2023
CMS Open Payments shows 13 general payments to Dr. Chang from 4 drug and device companies from 2017 to 2023. Food and beverage make up the largest share, 80% of the total. W. L. Gore & Associates, Inc. paid the most, $926.
General payments to Dr. Chang by program year, 2017 to 2023
General payments to Dr. Chang by kind, 2017 to 2023
- Food and beverage$1,02780%
- Travel and lodging$25020%
Companies that paid Dr. Chang the most, 2017 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Robert Won-Kee Chang graduated from University of Southern California Keck School of Medicine
Dr. Chang graduated from University of Southern California Keck School of Medicine in 1999.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Robert Won-Kee Chang's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Robert Won-Kee Chang
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Robert Won-Kee Chang's NPI number?
Dr. Robert Won-Kee Chang's NPI number is 1316059058. It was assigned on August 31, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Robert Won-Kee Chang?
Dr. Robert Won-Kee Chang is a vascular surgeon in Redwood City, California. The primary specialty in the NPI Registry is Vascular Surgery Physician (taxonomy code 2086S0129X).
Where does Dr. Robert Won-Kee Chang practice?
Dr. Chang practices at 1190 Veterans Blvd, Redwood City, CA 94063. Dr. Chang's primary practice is Permanente Medical Group Inc in Redwood City, California. Dmand AI also links Dr. Chang to 1 hospital.
What is Dr. Robert Won-Kee Chang's office phone number?
The practice phone on file for Dr. Chang is (650) 299-2000.
What is Dr. Robert Won-Kee Chang's medical license number?
Dr. Chang holds New Hampshire license RT 1566.
Which hospitals is Dr. Robert Won-Kee Chang affiliated with?
Dr. Chang is affiliated with Dartmouth Hitchcock Medical Center. Dmand AI links Dr. Chang to 1 more hospital.
What medical group is Dr. Robert Won-Kee Chang part of?
Dr. Chang is linked to The Permanente Medical Group, Inc.
Does Dr. Robert Won-Kee Chang accept Medicare?
Yes. CMS lists Dr. Chang as accepting Medicare assignment.
Where did Dr. Robert Won-Kee Chang go to medical school?
Dr. Chang graduated from University of Southern California Keck School of Medicine in 1999.
What drugs does Dr. Robert Won-Kee Chang prescribe most?
In 2024 Medicare Part D data, Dr. Chang's most prescribed drugs by claims were Clopidogrel.
Has Dr. Robert Won-Kee Chang received payments from drug or device companies?
CMS Open Payments shows $1,277 in general payments to Dr. Chang from 4 companies from 2017 to 2023. The largest total came from W. L. Gore & Associates, Inc.
How long has Dr. Robert Won-Kee Chang been practicing?
Dr. Chang graduated from medical school in 1999, 27 years ago.
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