Dr. Gregory S. Chang, MD
- Industry payments
- $138
- Affiliated sites
- 2
- Medical group
- 1
- Insurance carriers
- 2
- State licenses
- 2
- Practice address
- 2238 Geary Blvd, San Francisco, CA 94115
- Practice phone
- Call (415) 833-3700
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
San Francisco Medical Center - Mammography
Mammography / Breast Imaging Center · San Francisco, 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. Gregory S. Chang is an anesthesiologist in San Francisco, California
Dr. Chang practices at San Francisco Medical Center - Mammography in San Francisco, California.
Dr. Chang's NPI, 1801974407, was assigned on November 1, 2006. Dr. Chang graduated from University of Pittsburgh School of Medicine in 1994. Dr. Chang holds California license C51149.
- NPI
- 1801974407NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1456549252
- NPI enumeration date
- November 1, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (415) 833-3700
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 58
- Medical school graduation
- 1994
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory S. Chang practices at San Francisco Medical Center - Mammography in San Francisco, California
Dr. Chang's primary practice is San Francisco Medical Center - Mammography, at 2238 Geary Blvd, San Francisco, CA 94115. The practice phone is (415) 833-3700.
- San Francisco Medical Center - Mammography2238 Geary Blvd, San Francisco, CA 94115Phone(415) 833-3700
Source: Dmand AI Affiliation Data
Dr. Gregory S. Chang is affiliated with 2 sites of care and 1 medical group
Dr. Chang's primary practice is San Francisco Medical Center - Mammography in San Francisco, California. The medical group on file is The Permanente Medical Group, Inc. Dmand AI also links Dr. Chang to 1 more group practice or clinic, named with a free account. Dr. Chang's employer is on file too: a breast imaging center.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gregory S. 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 |
|---|---|
| San Francisco Medical Center - Mammography | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregory S. Chang is one of 6,593 anesthesiologists in California
Anesthesiology is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 207L00000X. Dr. Chang is board certified in anesthesiology by the American Board of Anesthesiology. Dmand AI has Dr. Chang's licenses on file in 2 states: California and Pennsylvania.
Specialties and state licenses
- Anesthesiology, CaliforniaPrimary
- Pennsylvania license
Anesthesiologists near Dr. Chang
Counts of anesthesiologists 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. Gregory S. Chang's patients have a median age of 57
Across all payers, Dmand AI patient panel data puts Dr. Chang's median patient age at 57, with 62% 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 57
Patient panel by sex, all payers
- Women62%
- Men38%
Source: Dmand AI Patient Panel Data
How Dr. Gregory S. 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)
Dr. Gregory S. Chang received $138 in industry payments from 2018 to 2024
CMS Open Payments shows 4 general payments to Dr. Chang from 4 drug and device companies from 2018 to 2024. Food and beverage make up the largest share, 100% of the total. Mallinckrodt LLC paid the most, $51.
General payments to Dr. Chang by program year, 2018 to 2024
Companies that paid Dr. Chang the most, 2018 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gregory S. Chang graduated from University of Pittsburgh School of Medicine
Dr. Chang graduated from University of Pittsburgh School of Medicine in 1994. Dr. Chang is a member of AAPM.
- Medical school
- Board certified in anesthesiology
Source: Dmand AI Professional Profile Data
Dr. Gregory S. Chang accepts plans from 2 insurance carriers
Dr. Chang is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
- CMS Medicare
Plan types Dr. Chang accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Gregory S. 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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| 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 |
| Insurance carriers and plan types | Dmand AI Insurance Network 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. Gregory S. 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. Gregory S. Chang's NPI number?
Dr. Gregory S. Chang's NPI number is 1801974407. It was assigned on November 1, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory S. Chang?
Dr. Gregory S. Chang is an anesthesiologist in San Francisco, California. The primary specialty in the NPI Registry is Anesthesiology Physician (taxonomy code 207L00000X).
Where does Dr. Gregory S. Chang practice?
Dr. Chang practices at 2238 Geary Blvd, San Francisco, CA 94115. Dr. Chang's primary practice is San Francisco Medical Center - Mammography in San Francisco, California. Dmand AI also links Dr. Chang to 1 group practice or clinic.
What is Dr. Gregory S. Chang's office phone number?
The practice phone on file for Dr. Chang is (415) 833-3700.
What is Dr. Gregory S. Chang's medical license number?
Dr. Chang holds California license C51149, one of the licenses on file in 2 states.
Which states has Dr. Gregory S. Chang been licensed in?
Dmand AI has state licenses on file for Dr. Chang in California (2003 to 2027) and Pennsylvania (1996 to 1998).
What medical group is Dr. Gregory S. Chang part of?
Dr. Chang is linked to The Permanente Medical Group, Inc.
Does Dr. Gregory S. Chang accept Medicare?
Yes. CMS lists Dr. Chang as accepting Medicare assignment.
Is Dr. Gregory S. Chang board certified?
Yes. Dr. Chang is board certified in anesthesiology by the American Board of Anesthesiology.
Where did Dr. Gregory S. Chang go to medical school?
Dr. Chang graduated from University of Pittsburgh School of Medicine in 1994.
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Has Dr. Gregory S. Chang received payments from drug or device companies?
CMS Open Payments shows $138 in general payments to Dr. Chang from 4 companies from 2018 to 2024. The largest total came from Mallinckrodt LLC.
How long has Dr. Gregory S. Chang been practicing?
Dr. Chang graduated from medical school in 1994, 32 years ago.
What insurance does Dr. Gregory S. Chang accept?
Dr. Chang is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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