Eric Chak, M.D.
Gastroenterology Physician · Davis, CA
Eric Chak, M.D. is a gastroenterology physician with a practice address in Davis, California, and NPI 1225271331, issued on Apr 20, 2009. Check the license (California A114205, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Eric Chak
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- A114205 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2068 John Jones RD, Davis, CA 95616
- Phone
- (530) 747-0389
- Enumerated
- Apr 20, 2009
- Record last updated
- Mar 5, 2025
- Medicare enrollment
- Enrolled (PECOS I20111230000057); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 2009
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Also registered at 2068 John Jones RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Spencer Frost, MDGastroenterology Physician1407352396
- Robert Silva, MDGastroenterology Physician1902997935
Verify Eric Chak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A114205Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
30% fewer Medicare Part D claims than the average gastroenterology physician in 2024
569 Medicare Part D claims for 196 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 32% of claims. 12 claims were for opioids.
Most prescribed
- Vemlidy98 claims
- Entecavir46 claims
- Pantoprazole Sodium39 claims
- Gavilyte-G34 claims
- Xifaxan32 claims
- Spironolactone31 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.
Industry payments in 2024: $19.75
1 payment: food and beverage; the largest payer was Takeda Pharmaceuticals U.S.A., Inc. The 13,350 providers of this specialty with any payment received $5,015.95 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.
Bills Medicare through one group practice
- Sutter Valley Medical FoundationDavis, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Eric Chak among 2,140 gastroenterology physician records in California
Eric Chak, M.D. is one of 2,140 gastroenterology physician records with a practice address in California. 83% 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 69% of them.
- NPI issued2009 · 69% of these records are older, 28% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2009 · median 2002 among the 1,538 with a school on file
- Record last updated2025 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in California
There are 2,140 gastroenterology physician records in California.
All 2,140 in California → Every provider in Davis → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Spencer Frost, MDDavis, CA 956161407352396
- Ian Logan, M.D.Davis, CA 956161164572186
- Robert Silva, MDDavis, CA 956161902997935
- Richard Chun, M.D.Citrus Heights, CA 956101003818055
- Michael MassaroCarmichael, CA 956081558741447
- Kuldip Sandhu, MDCarmichael, CA 956081346380359
- David Schneiderman, MDCarmichael, CA 956081407867211
- Amanpal Singh, MDCarmichael, CA 956081184829749
Common questions
What is Eric Chak, M.D.'s NPI number?
Eric Chak, M.D.'s National Provider Identifier (NPI) is 1225271331, issued on Apr 20, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Eric Chak, M.D. located?
The NPPES record lists a practice address at 2068 John Jones RD, Davis, CA, 95616. Phone: (530) 747-0389. Providers update this record themselves, so call before visiting.
How can I verify Eric Chak, M.D.'s license?
NPPES lists California license number A114205, 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 Eric Chak, M.D. prescribe under Medicare Part D?
In 2024, Eric Chak, M.D. had 569 Medicare Part D claims for 196 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.