Dr. Sheryl J. Kwak, MD
- Part D claims, 2024
- 73
- Hospital affiliations
- 1
- Industry payments
- $26
- Medical group
- 1
- Insurance carriers
- 2
- Practice address
- 9965 Sierra Ave, Fontana, CA 92335
- Practice phone
- Call (909) 427-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Kaiser Permanente - Fontana Medical Center
Fontana, California
Find Dr. Kwak's professional email, personal email and mobile number
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Dr. Sheryl J. Kwak is a general surgeon in Fontana, California
Dr. Kwak practices at Kaiser Permanente - Fontana Medical Center in Fontana, California.
Dr. Kwak's NPI, 1104065259, was assigned on February 12, 2009. Dr. Kwak graduated from UC Davis School of Medicine in 2008. Dr. Kwak holds California license A139253.
- NPI
- 1104065259NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1456656131
- NPI enumeration date
- February 12, 2009
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (909) 427-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 44
- Medical school graduation
- 2008
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Sheryl J. Kwak practices at Kaiser Permanente - Fontana Medical Center in Fontana, California
Dr. Kwak's primary practice is Kaiser Permanente - Fontana Medical Center, at 9965 Sierra Ave, Fontana, CA 92335 in San Bernardino County. The practice phone is (909) 427-5000.
- Kaiser Permanente - Fontana Medical Center9965 Sierra Ave, Fontana, CA 92335 · San Bernardino CountyPhone(909) 427-5000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Sheryl J. Kwak is affiliated with 2 sites of care and 1 medical group
Dr. Kwak's primary practice is Kaiser Permanente - Fontana Medical Center in Fontana, California. Dr. Kwak is also affiliated with Fontana Medical Center. The medical group on file is Southern California Permanente Medical Group.
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. Sheryl J. Kwak's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Kwak practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Kaiser Permanente - Fontana Medical Center | 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. Sheryl J. Kwak is one of 2,926 general surgeons in California
Surgery is Dr. Kwak's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Kwak is board certified in surgical critical care by the American Board of Emergency Medicine. Dmand AI has Dr. Kwak's licenses on file in 3 states: California, Texas and Michigan.
Specialties and state licenses
- Surgery, CaliforniaPrimary
- Texas license
- Michigan license
Clinical focus
Dmand AI lists groin hernia surgery among the conditions Dr. Kwak treats.
General surgeons near Dr. Kwak
Counts of general 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. Sheryl J. Kwak's patients have a median age of 52
Across all payers, Dmand AI patient panel data puts Dr. Kwak's median patient age at 52, with 66% women.
Dr. Kwak's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 52
Patient panel by sex, all payers
- Women66%
- Men34%
Source: Dmand AI Patient Panel Data
Dr. Sheryl J. Kwak wrote 73 Medicare Part D claims in 2024
In 2024, Dr. Kwak wrote 73 Medicare Part D claims for 44 patients. 100% of them were for generic drugs. CMS names the drug for 31 of them, across 1 drug with 11 or more claims each, at $343 in total drug cost. In 2023, CMS named 28 claims across 1 drug.
Dr. Kwak'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. Kwak's Part D claims, 2024
- Opioids62%45 of 73 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: 282024: 3111%
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. Sheryl J. Kwak takes part in Medicare
Dr. Kwak 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. Sheryl J. Kwak received $26 in industry payments in 2021
CMS Open Payments shows 1 general payment to Dr. Kwak from 1 drug or device company in 2021. Food and beverage make up the largest share, 100% of the total. W. L. Gore & Associates, Inc. paid the most, $26.
Companies that paid Dr. Kwak the most, 2021 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Sheryl J. Kwak graduated from UC Davis School of Medicine
Dr. Kwak graduated from UC Davis School of Medicine in 2008.
- Medical school
- Board certified in surgical critical care
- Board certified in surgery
- Board certified in surgical critical care
Source: Dmand AI Professional Profile Data
Dr. Sheryl J. Kwak accepts plans from 2 insurance carriers
Dr. Kwak 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. Kwak accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Sheryl J. Kwak'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 |
| 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. Sheryl J. Kwak
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. Sheryl J. Kwak's NPI number?
Dr. Sheryl J. Kwak's NPI number is 1104065259. It was assigned on February 12, 2009, and it is active in the NPI Registry.
What kind of doctor is Dr. Sheryl J. Kwak?
Dr. Sheryl J. Kwak is a general surgeon in Fontana, California. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Sheryl J. Kwak practice?
Dr. Kwak practices at 9965 Sierra Ave, Fontana, CA 92335. Dr. Kwak's primary practice is Kaiser Permanente - Fontana Medical Center in Fontana, California.
What is Dr. Sheryl J. Kwak's office phone number?
The practice phone on file for Dr. Kwak is (909) 427-5000.
What is Dr. Sheryl J. Kwak's medical license number?
Dr. Kwak holds California license A139253, one of the licenses on file in 3 states.
Which states has Dr. Sheryl J. Kwak been licensed in?
Dmand AI has state licenses on file for Dr. Kwak in California (2015 to 2027), Texas and Michigan (2014 to 2018).
Which hospitals is Dr. Sheryl J. Kwak affiliated with?
Dr. Kwak is affiliated with Fontana Medical Center.
What medical group is Dr. Sheryl J. Kwak part of?
Dr. Kwak is linked to Southern California Permanente Medical Group.
Does Dr. Sheryl J. Kwak accept Medicare?
Yes. CMS lists Dr. Kwak as accepting Medicare assignment.
Is Dr. Sheryl J. Kwak board certified?
Yes. Dr. Kwak is board certified in surgical critical care by the American Board of Emergency Medicine.
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Where did Dr. Sheryl J. Kwak go to medical school?
Dr. Kwak graduated from UC Davis School of Medicine in 2008.
What drugs does Dr. Sheryl J. Kwak prescribe most?
In 2024 Medicare Part D data, Dr. Kwak's most prescribed drugs by claims were Hydrocodone-Acetaminophen.
Has Dr. Sheryl J. Kwak received payments from drug or device companies?
CMS Open Payments shows $26 in general payments to Dr. Kwak from 1 company from 2021 to 2021. The largest total came from W. L. Gore & Associates, Inc.
How long has Dr. Sheryl J. Kwak been practicing?
Dr. Kwak graduated from medical school in 2008, 18 years ago.
What insurance does Dr. Sheryl J. Kwak accept?
Dr. Kwak 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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