Kristen Vierregger, MD
General Practice Physician · Buena Park, CA
Kristen Vierregger, MD is a general practice physician with a practice address in Buena Park, California, and NPI 1447699582, issued on Jun 21, 2013. Check the license (California A112427, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Kristen Vierregger
- Credential
- MD
- Primary taxonomy
- General Practice Physician 208D00000X
- License number
- A112427 CA
Self-reported in NPPES; status is on the state search - Practice location
- 8081 Stanton Ave Ste 300, Buena Park, CA 90620
- Phone
- (714) 484-8000
- Enumerated
- Jun 21, 2013
- Record last updated
- Jun 21, 2022
- Fax
- (714) 484-8800
- Entity
- Type 1 · individual
8 nearest general practice physician records → All 1,956 in California → Look up another NPI →
Verify Kristen Vierregger in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A112427Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average general practice physician in 2024
281 Medicare Part D claims for 32 beneficiaries, against an average of 3,030 among the 8,395 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Progesterone60 claims
- Estradiol40 claims
- Estradiol Valerate33 claims
- Bicalutamide24 claims
- Escitalopram Oxalate17 claims
- Estradiol (Once Weekly)12 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.
Kristen Vierregger among 1,956 general practice physician records in California
Kristen Vierregger, MD is one of 1,956 general practice physician records with a practice address in California. 48% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 68% of them.
- NPI issued2013 · 68% of these records are older, 29% newer
- In a Medicare fileYes · 48% of these records are
- In the CMS Doctors and Clinicians fileNo · 27% of these records are
- Record last updated2022 · 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 208D00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
General Practice Physician providers in California
There are 1,956 general practice physician records in California.
All 1,956 in California → Every provider in Buena Park → General Practice Physician nationwide →
The 8 general practice physician records with the nearest ZIP codes
- Hoyune Cho, M.D.Buena Park, CA 906211033504311
- Roy Nambudripad, M.D.Buena Park, CA 906211376732867
- David Lee, MDLa Palma, CA 906231962818179
- Geetha Gabbita, M.D.Whittier, CA 906051881602175
- May Mudarry Daw, M.D.Whittier, CA 906051669547055
- Claude Cahen, M.D.Whittier, CA 906031881614352
- Dwight David, MDWhittier, CA 906031487653531
- Shokouh Tamadon, MDWhittier, CA 906031992703912
Common questions
What is Kristen Vierregger, MD's NPI number?
Kristen Vierregger, MD's National Provider Identifier (NPI) is 1447699582, issued on Jun 21, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Kristen Vierregger, MD located?
The NPPES record lists a practice address at 8081 Stanton Ave Ste 300, Buena Park, CA, 90620. Phone: (714) 484-8000. Providers update this record themselves, so call before visiting.
How can I verify Kristen Vierregger, MD's license?
NPPES lists California license number A112427, 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 Kristen Vierregger, MD prescribe under Medicare Part D?
In 2024, Kristen Vierregger, MD had 281 Medicare Part D claims for 32 beneficiaries; the average among general practice physician prescribers was 3,030. 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.