Sheryl Kwak, M.D.
Surgery Physician · Fontana, CA
Sheryl Kwak, M.D. is a surgery physician with a practice address in Fontana, California, and NPI 1104065259, issued on Feb 12, 2009. Check the license (California A139253, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Sheryl Kwak
- Credential
- M.D.
- Primary taxonomy
- Surgery Physician 208600000X
- License numbers
- A139253 CA
BP10031148 TX
Self-reported in NPPES; status is on the state search - Practice location
- 9961 Sierra Ave, Fontana, CA 92335
- Phone
- (909) 427-6163
- Enumerated
- Feb 12, 2009
- Record last updated
- Nov 29, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20160217001119); accepts Medicare assignment
- Medical or professional school
- University Of California, Davis School Of Medicine, 2008
- Entity
- Type 1 · individual
8 nearest surgery physician records → All 3,118 in California → Look up another NPI →
Also registered at 9961 Sierra Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Michael Adair, MDFamily Medicine Physician1780732651
- Berneva Adams, MDObstetrics & Gynecology Physician1376602987
Verify Sheryl Kwak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A139253Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
50% fewer Medicare Part D claims than the average surgery physician in 2024
73 Medicare Part D claims for 44 beneficiaries, against an average of 147 among the 20,115 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 45 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen31 claims
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.
Bills Medicare through one group practice
- Southern California Permanente Medical GroupFontana, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Sheryl Kwak among 3,118 surgery physician records in California
Sheryl Kwak, M.D. is one of 3,118 surgery physician records with a practice address in California. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 63% of them.
- NPI issued2009 · 63% of these records are older, 33% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 61% of these records are
- Graduated2008 · median 2003 among the 1,901 with a school on file
- Record last updated2021 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208600000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Surgery Physician providers in California
There are 3,118 surgery physician records in California.
All 3,118 in California → Every provider in Fontana → Surgery Physician nationwide →
The 8 surgery physician records with the nearest ZIP codes
- Lori Chow, MDFontana, CA 923351437220464
- Siu-Keung Chung, M.D.Fontana, CA 923351295797751
- Clifford Eke, MDFontana, CA 923351366501959
- Lawrence Harms, MDFontana, CA 923351821146739
- Taylor Ho, MDFontana, CA 923351003988585
- Samir Johna, MDFontana, CA 923351063571628
- Daniel Klaristenfeld, MDFontana, CA 923351780732701
- Jane Ong, MDFontana, CA 923351538236351
Common questions
What is Sheryl Kwak, M.D.'s NPI number?
Sheryl Kwak, M.D.'s National Provider Identifier (NPI) is 1104065259, issued on Feb 12, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Sheryl Kwak, M.D. located?
The NPPES record lists a practice address at 9961 Sierra Ave, Fontana, CA, 92335. Phone: (909) 427-6163. Providers update this record themselves, so call before visiting.
How can I verify Sheryl Kwak, M.D.'s license?
NPPES lists California license number A139253, 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 Sheryl Kwak, M.D. prescribe under Medicare Part D?
In 2024, Sheryl Kwak, M.D. had 73 Medicare Part D claims for 44 beneficiaries; the average among surgery physician prescribers was 147. 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.