Hang Nguyen Claus, M.D.
Obstetrics & Gynecology Physician · Vacaville, CA
Hang Nguyen Claus, M.D. is an obstetrics & gynecology physician with a practice address in Vacaville, California, and NPI 1144594334, issued on Mar 6, 2012. Check the license (California A119725, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Hang Nguyen Claus
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A119725 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1 Quality Dr, Vacaville, CA 95688
- Phone
- (707) 624-4000
- Enumerated
- Mar 6, 2012
- Record last updated
- Dec 15, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20121112000335); accepts Medicare assignment
- Medical or professional school
- University Of California, Geffen School Of Medicine, 2008
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 1 Quality Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Jonathan Abaya Ghazaleh, MDInternal Medicine Physician1093395535
- Huma Ahmad, D.O.Hospitalist Physician1154587616
- Azim Ahmady, MDFamily Medicine Physician1417035916
- Lamia Alazzawi, PHARM.D.Pharmacist1407380645
- Delaine Alejandro, DOFamily Medicine Physician1487816294
Verify Hang Nguyen Claus in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A119725Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% more Medicare Part D claims than the average obstetrics & gynecology physician in 2024
316 Medicare Part D claims for 134 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims.
Most prescribed
- Estradiol131 claims
- Estring36 claims
- Medroxyprogesterone Acetate22 claims
- Clobetasol Propionate17 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
- Permanente Medical Group IncVallejo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Hang Nguyen Claus among 5,088 obstetrics & gynecology physician records in California
Hang Nguyen Claus, M.D. is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 75% of them.
- NPI issued2012 · 75% of these records are older, 22% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2008 · median 2004 among the 2,700 with a school on file
- Record last updated2021 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in California
There are 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in Vacaville → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Camille Barnes, M.D.Vacaville, CA 956881174532667
- Thomas Brown, DOVacaville, CA 956881538247432
- Michelle Contreras, M.D.Vacaville, CA 956881730499252
- Ashleigh Denny, MDVacaville, CA 956881376801134
- Bruce Filarsky, MDVacaville, CA 956881477631299
- Elena Fuell Wysong, MDVacaville, CA 956881952842171
- James Hanser, MDVacaville, CA 956881538247341
- Lynne Hollison, MDVacaville, CA 956881750469573
Common questions
What is Hang Nguyen Claus, M.D.'s NPI number?
Hang Nguyen Claus, M.D.'s National Provider Identifier (NPI) is 1144594334, issued on Mar 6, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Hang Nguyen Claus, M.D. located?
The NPPES record lists a practice address at 1 Quality Dr, Vacaville, CA, 95688. Phone: (707) 624-4000. Providers update this record themselves, so call before visiting.
How can I verify Hang Nguyen Claus, M.D.'s license?
NPPES lists California license number A119725, 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 Hang Nguyen Claus, M.D. prescribe under Medicare Part D?
In 2024, Hang Nguyen Claus, M.D. had 316 Medicare Part D claims for 134 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. 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.