Michael Shim, M.D.
Gastroenterology Physician · Oceanside, CA
Michael Shim, M.D. is a gastroenterology physician with a practice address in Oceanside, California, and NPI 1851503353, issued on May 4, 2007. Check the license (California A88942, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Michael Shim
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- A88942 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3923 Waring RD Ste A, Oceanside, CA 92056
- Phone
- (760) 724-8782
- Enumerated
- May 4, 2007
- Record last updated
- Feb 25, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (760) 842-7801
- Medicaid ID
- 1851503353 CA
- Medicare enrollment
- Enrolled (PECOS I20080805000698); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 3923 Waring RD Ste A
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sara Andolina, NPFamily Nurse Practitioner1194142570
- Hellen Chiao, MDGastroenterology Physician1154681435
- Tobiah Clukey, FNP-CFamily Nurse Practitioner1306525662
- Christopher Devereaux, M.D.Gastroenterology Physician1376512848
- Megan Novo, MDGastroenterology Physician1770961971
- Javaid Shad, M.D.Gastroenterology Physician1003885922
Verify Michael Shim in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A88942Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
15% more Medicare Part D claims than the average gastroenterology physician in 2024
934 Medicare Part D claims for 517 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims.
Most prescribed
- Gavilyte-C323 claims
- Omeprazole145 claims
- Pantoprazole Sodium56 claims
- Sod Sulf-Potass Sulf-Mag Sulf48 claims
- Dexlansoprazole Dr42 claims
- Linzess37 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: $1,928.74
90 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie 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
- North County Gastroenterology Medical Group IncOceanside, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gastroenterology Physician providers in California
There are 2,140 gastroenterology physician records in California.
Other gastroenterology physician records in California
- David Aarons, MDLodi, CA1619081379
- Constante Abaya, MDOxnard, CA1003918459
- Sadeea Abbasi, M.D., PH.D.Los Angeles, CA1366713513
- Basim Abdelkarim, MDUpland, CA1932217544
- Homan Abdollahzadeh, MDPalm Springs, CA1184634826
- John Abdulian, M.D.Fresno, CA1437114113
- Hussein Abidali, DORancho Cucamonga, CA1205274768
- Alaa Abousaif, MDOrange, CA1235124108
- Donald Abrahm, M.D.Newport Beach, CA1215022405
- Maria Abreu, M.D.West Hollywood, CA1598793374
Common questions
What is Michael Shim, M.D.'s NPI number?
Michael Shim, M.D.'s National Provider Identifier (NPI) is 1851503353, issued on May 4, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Michael Shim, M.D. located?
The NPPES record lists a practice address at 3923 Waring RD Ste A, Oceanside, CA, 92056. Phone: (760) 724-8782. Providers update this record themselves, so call before visiting.
How can I verify Michael Shim, M.D.'s license?
NPPES lists California license number A88942, 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 Michael Shim, M.D. prescribe under Medicare Part D?
In 2024, Michael Shim, M.D. had 934 Medicare Part D claims for 517 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.