Hal S. Shimazu, MD
Family Medicine Physician · Orange, CA
Hal S. Shimazu, MD is a family medicine physician with a practice address in Orange, California, and NPI 1073682241, issued on Nov 6, 2006. Check the license (California G37057, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Hal S. Shimazu
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- G37057 CA
Self-reported in NPPES; status is on the state search - Practice location
- 845 E Chapman Ave, Orange, CA 92866
- Phone
- (714) 997-2899
- Enumerated
- Nov 6, 2006
- Record last updated
- Nov 28, 2025
- Fax
- (714) 289-7062
- Medicaid ID
- 00G370570 CA
- Medicare enrollment
- Enrolled (PECOS I20090203000540); accepts Medicare assignment
- Medical or professional school
- University Of California, Davis School Of Medicine, 1977
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 845 E Chapman Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Annette Bernhut, D.O.Family Medicine Physician1841367471
- Ana Fajardo, M.D.Family Medicine Physician1154498798
- Kristi Hare, FNP-BCFamily Nurse Practitioner1679871172
- Thomas Hryniewicki, M.D.Internal Medicine Physician1992807341
- Anne Stahl-Hughitt, NPNurse Practitioner1629126560
- Christina Yarwood, P.A.Medical Physician Assistant1174684666
Verify Hal S. Shimazu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G37057Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.8 times the Medicare Part D claims of the average family medicine physician in 2024
10,076 Medicare Part D claims for 801 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 177 claims were for opioids.
Most prescribed
- Atorvastatin Calcium793 claims
- Rosuvastatin Calcium592 claims
- Losartan Potassium537 claims
- Ezetimibe415 claims
- Amlodipine Besylate301 claims
- Levothyroxine Sodium284 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: $241.61
12 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 55,478 providers of this specialty with any payment received $902.55 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 2 group practices
- Centers For Family Medicine GPLos Alamitos, CA
- Healthcare Partners Affiliates Medical GroupOrange, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
106 family medicine physician records list a practice address in Orange
They are 106 of the 13,245 NPPES records with a practice address in Orange, and 17,133 family medicine physician records in California.
All 106 in Orange → All 17,133 in California → Every provider in Orange →
Other family medicine physician records in California
- Omer Aba-Omer, MDSanta Monica, CA1649702093
- Michelle Ababa, MDWilmington, CA1710922513
- Anna Tzeitel Abalos, MDRoseville, CA1720200017
- Adan Abarca, MDAnaheim, CA1760553689
- Vanessa Abarca, DOVentura, CA1952040859
- Lorraine Abate, M.D.Sacramento, CA1104840008
- Robert Abatecola, MDCastro Valley, CA1669551719
- Romeo Abaya, M.D.Cottonwood, CA1598053506
- Effiem Abbah, MD, MPHSan Francisco, CA1821185133
- Khuzeman Abbasi, MDSanta Rosa, CA1841979952
Common questions
What is Hal S. Shimazu, MD's NPI number?
Hal S. Shimazu, MD's National Provider Identifier (NPI) is 1073682241, issued on Nov 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Hal S. Shimazu, MD located?
The NPPES record lists a practice address at 845 E Chapman Ave, Orange, CA, 92866. Phone: (714) 997-2899. Providers update this record themselves, so call before visiting.
How can I verify Hal S. Shimazu, MD's license?
NPPES lists California license number G37057, 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 Hal S. Shimazu, MD prescribe under Medicare Part D?
In 2024, Hal S. Shimazu, MD had 10,076 Medicare Part D claims for 801 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.