Karen Simpson, MD
Dermatology Physician · Brea, CA
Karen Simpson, MD is a dermatology physician with a practice address in Brea, California, and NPI 1376544189, issued on Aug 2, 2005. Check the license (California G75453, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Karen Simpson
- Credential
- MD
- Primary taxonomy
- Dermatology Physician 207N00000X
- License number
- G75453 CA
Self-reported in NPPES; status is on the state search - Practice location
- 955 W Imperial Hwy Ste 200, Brea, CA 92821
- Phone
- (714) 626-6310
- Enumerated
- Aug 2, 2005
- Record last updated
- Nov 10, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (714) 626-6320
- Medicare enrollment
- Enrolled (PECOS I20050616001233); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest dermatology physician records → All 2,083 in California → Look up another NPI →
Also registered at 955 W Imperial Hwy Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Brenda Aguilar, DNPNurse Practitioner1639875982
- Christine Choi, NPPediatric Nurse Practitioner1235635129
- Tiffany Dang, NPFamily Nurse Practitioner1376059253
- Alexandra Edelman, MDDermatology Physician1700240249
- Aeri Kang, M.D.Internal Medicine Physician1689660755
- Amina Larbah, MDPediatrics Physician1326667213
Verify Karen Simpson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G75453Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
7% fewer Medicare Part D claims than the average dermatology physician in 2024
738 Medicare Part D claims for 322 beneficiaries, against an average of 797 among the 12,802 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims.
Most prescribed
- Ketoconazole129 claims
- Triamcinolone Acetonide83 claims
- Doxycycline Hyclate78 claims
- Fluorouracil61 claims
- Imiquimod46 claims
- Metronidazole43 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: $319.02
10 payments; by number, the most common kind was food and beverage; the largest payer was Genzyme Corporation. The 10,250 providers of this specialty with any payment received $8,544.61 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
- Providence Medical FoundationFullerton, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karen Simpson among 2,083 dermatology physician records in California
Karen Simpson, MD is one of 2,083 dermatology 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 94% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated1991 · median 2006 among the 1,450 with a school on file
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207N00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Dermatology Physician providers in California
There are 2,083 dermatology physician records in California.
All 2,083 in California → Every provider in Brea → Dermatology Physician nationwide →
The 8 dermatology physician records with the nearest ZIP codes
- Renee Cobos, MDBrea, CA 928211801896857
- Alexandra Edelman, MDBrea, CA 928211700240249
- Zhe Hou, MDBrea, CA 928211760800973
- Chiangyuan Liau, M.D..Brea, CA 928211891721171
- Bruce Park, MDFullerton, CA 928311841378825
- Edward Aston, M. D.Fullerton, CA 928351710917513
- Marina Ball, MDAnaheim, CA 928071003983974
- William Baugh, M. D.Fullerton, CA 928351891725602
Common questions
What is Karen Simpson, MD's NPI number?
Karen Simpson, MD's National Provider Identifier (NPI) is 1376544189, issued on Aug 2, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Karen Simpson, MD located?
The NPPES record lists a practice address at 955 W Imperial Hwy Ste 200, Brea, CA, 92821. Phone: (714) 626-6310. Providers update this record themselves, so call before visiting.
How can I verify Karen Simpson, MD's license?
NPPES lists California license number G75453, 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 Karen Simpson, MD prescribe under Medicare Part D?
In 2024, Karen Simpson, MD had 738 Medicare Part D claims for 322 beneficiaries; the average among dermatology physician prescribers was 797. 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.