Dr. Tammy Wing Sam Chew, MD
- Part D claims, 2024
- 2,192
- Hospital affiliations
- 1
- Industry payments
- $45
- Medical group
- 1
- State license
- 1
- 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. Chew'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. Tammy Wing Sam Chew is a family medicine physician in San Francisco, California
Dr. Chew practices at San Francisco Medical Center - Mammography in San Francisco, California.
Dr. Chew's NPI, 1235584863, was assigned on May 2, 2016. Dr. Chew holds California license A150983.
- NPI
- 1235584863NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4880956051
- NPI enumeration date
- May 2, 2016
- 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
- Female
- Estimated age
- 36
- Medical school graduation
- 2016
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Tammy Wing Sam Chew practices at San Francisco Medical Center - Mammography in San Francisco, California
Dr. Chew'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. Tammy Wing Sam Chew is affiliated with 2 sites of care and 1 medical group
Dr. Chew's primary practice is San Francisco Medical Center - Mammography in San Francisco, California. Dr. Chew is also affiliated with UCI Health - Orange. The medical group on file is The Permanente Medical Group, Inc. Dr. Chew'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. Tammy Wing Sam Chew's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chew 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. Tammy Wing Sam Chew is one of 15,680 family medicine physicians in California
Family medicine is Dr. Chew's primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Chew is licensed in California.
Specialties and state licenses
- Family medicine, CaliforniaPrimary
Family medicine physicians near Dr. Chew
Counts of family medicine physicians 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. Tammy Wing Sam Chew's patients have a median age of 55
Across all payers, Dmand AI patient panel data puts Dr. Chew's median patient age at 55, with 67% women.
Dr. Chew's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 55
Patient panel by sex, all payers
- Women67%
- Men31%
Source: Dmand AI Patient Panel Data
Dr. Tammy Wing Sam Chew wrote 2,192 Medicare Part D claims in 2024
In 2024, Dr. Chew wrote 2,192 Medicare Part D claims for 359 patients. 93% of them were for generic drugs. CMS names the drug for 1,816 of them, across 45 drugs with 11 or more claims each, at $38,228 in total drug cost. In 2023, CMS named 1,791 claims across 45 drugs.
Dr. Chew's Part D claims by kind of drug, 2024
- Generic2,049 claims93%
- Brand-name and other143 claims7%
Dr. Chew'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.
Drug classes CMS tracks in Dr. Chew's Part D claims, 2024
- Opioids1%18 of 2,192 claims
- Antibiotics2%49 of 2,192 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,7912024: 1,8161%
Drugs named by CMS: 45 in 2024, 45 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. Tammy Wing Sam Chew takes part in Medicare
Dr. Chew 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. Tammy Wing Sam Chew received $45 in industry payments in 2018
CMS Open Payments shows 1 general payment to Dr. Chew from 1 drug or device company in 2018. Food and beverage make up the largest share, 100% of the total. Merck Sharp & Dohme Corporation paid the most, $45.
Companies that paid Dr. Chew the most, 2018 to 2018
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Tammy Wing Sam Chew'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 |
| 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) |
| 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. Tammy Wing Sam Chew
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. Tammy Wing Sam Chew's NPI number?
Dr. Tammy Wing Sam Chew's NPI number is 1235584863. It was assigned on May 2, 2016, and it is active in the NPI Registry.
What kind of doctor is Dr. Tammy Wing Sam Chew?
Dr. Tammy Wing Sam Chew is a family medicine physician in San Francisco, California. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. Tammy Wing Sam Chew practice?
Dr. Chew practices at 2238 Geary Blvd, San Francisco, CA 94115. Dr. Chew's primary practice is San Francisco Medical Center - Mammography in San Francisco, California.
What is Dr. Tammy Wing Sam Chew's office phone number?
The practice phone on file for Dr. Chew is (415) 833-3700.
What is Dr. Tammy Wing Sam Chew's medical license number?
Dr. Chew holds California license A150983.
Which hospitals is Dr. Tammy Wing Sam Chew affiliated with?
Dr. Chew is affiliated with UCI Health - Orange.
What medical group is Dr. Tammy Wing Sam Chew part of?
Dr. Chew is linked to The Permanente Medical Group, Inc.
Does Dr. Tammy Wing Sam Chew accept Medicare?
Yes. CMS lists Dr. Chew as accepting Medicare assignment.
What drugs does Dr. Tammy Wing Sam Chew prescribe most?
In 2024 Medicare Part D data, Dr. Chew's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Losartan Potassium.
Has Dr. Tammy Wing Sam Chew received payments from drug or device companies?
CMS Open Payments shows $45 in general payments to Dr. Chew from 1 company from 2018 to 2018. The largest total came from Merck Sharp & Dohme Corporation.
How long has Dr. Tammy Wing Sam Chew been practicing?
Dr. Chew graduated from medical school in 2016, 10 years ago.
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