Roger Christopher Chang, MD, PHD
Epilepsy Physician · Palo Alto, CA
Roger Christopher Chang, MD, PHD is an epilepsy physician with a practice address in Palo Alto, California, and NPI 1679035216, issued on Apr 2, 2019. Check the license (California A186929, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Roger Christopher Chang
- Credential
- MD, PHD
- Primary taxonomy
- Epilepsy Physician 2084E0001X
- License number
- A186929 CA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Pasteur Dr, Palo Alto, CA 94304
- Phone
- (650) 723-4000
- Enumerated
- Apr 2, 2019
- Record last updated
- Jul 4, 2024
- Medicare enrollment
- Enrolled (PECOS I20240614002403); may accept Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 2019
- Entity
- Type 1 · individual
8 nearest epilepsy physician records → All 54 in California → Look up another NPI →
Also registered at 300 Pasteur Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Elias Aboujaoude, MDPsychiatry Physician1649209768
- Connor Adams, PSYDClinical Psychologist1467081216
- Terence Ahern, MDEmergency Medicine Physician1104195916
- Teddy Akiki, MDPsychiatry Physician1942867718
- Amy Alexander, M.D.Psychiatry Physician1740435486
- Monica Allen, PSYDClinical Psychologist1952787749
Verify Roger Christopher Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A186929Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average epilepsy physician in 2024
35 Medicare Part D claims for 13 beneficiaries, against an average of 934 among the 476 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $130.95
3 payments; by number, the most common kind was food and beverage; the largest payer was Jazz Pharmaceuticals Inc. The 345 providers of this specialty with any payment received $6,278.39 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Roger Christopher Chang among 54 epilepsy physician records in California
Roger Christopher Chang, MD, PHD is one of 54 epilepsy physician records with a practice address in California. 93% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 87% of them.
- NPI issued2019 · 87% of these records are older, 11% newer
- In a Medicare fileYes · 93% of these records are
- In the CMS Doctors and Clinicians fileYes · 80% of these records are
- Graduated2019 · median 2010 among the 43 with a school on file
- Record last updated2024 · 7% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084E0001X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Epilepsy Physician providers in California
There are 54 epilepsy physician records in California.
All 54 in California → Every provider in Palo Alto → Epilepsy Physician nationwide →
The 8 epilepsy physician records with the nearest ZIP codes
- Fiona Baumer, MDPalo Alto, CA 943041386969715
- William Gallentine, MDPalo Alto, CA 943041578595211
- Hyunmi Kim, MD, PHDPalo Alto, CA 943041811191836
- Juliet Knowles, MD, PHDPalo Alto, CA 943041285926618
- Olivia Marais, MDPalo Alto, CA 943041578309597
- Emily Spelbrink, MD, PHDPalo Alto, CA 943041821302043
- Katherine Xiong, MDPalo Alto, CA 943041386149284
- Robert Fisher, MDStanford, CA 943051669425740
Common questions
What is Roger Christopher Chang, MD, PHD's NPI number?
Roger Christopher Chang, MD, PHD's National Provider Identifier (NPI) is 1679035216, issued on Apr 2, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Roger Christopher Chang, MD, PHD located?
The NPPES record lists a practice address at 300 Pasteur Dr, Palo Alto, CA, 94304. Phone: (650) 723-4000. Providers update this record themselves, so call before visiting.
How can I verify Roger Christopher Chang, MD, PHD's license?
NPPES lists California license number A186929, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Roger Christopher Chang, MD, PHD prescribe under Medicare Part D?
In 2024, Roger Christopher Chang, MD, PHD had 35 Medicare Part D claims for 13 beneficiaries; the average among epilepsy physician prescribers was 934. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.