Karen Simpson, MD
NPI 1376544189 · Dermatology Physician · Brea, CA
Enrolled with Medicare as Practitioner - Dermatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Simpson, MD is a Dermatology Physician provider in Brea, CA (NPI 1376544189).
Provider details
- NPI number
- 1376544189
- Entity type
- Individual
- Primary specialty
- Dermatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- G75453 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,328 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Destruction of Precancer Skin Growth, 2-14 Growths17003 | 385 | $8 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 324 | $98 |
| Destruction of Precancer Skin Growth, 1 Growth17000 | 162 | $60 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 134 | $138 |
| Biopsy of Related Skin Growth, First Growth11102 | 104 | $103 |
| Destruction of Skin Growth, 1-14 Growths |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 17 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ketoconazole | 129 | 91 |
| Triamcinolone Acetonide | 83 | 51 |
| Doxycycline Hyclate | 78 | 25 |
| Fluorouracil | 61 | 58 |
| Imiquimod | 46 | 39 |
| Metronidazole | 43 | 30 |
| Clobetasol Propionate | 37 | 25 |
| Fluocinonide | 35 | 16 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$319 across 10 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-08-02
- Last updated
- 2021-11-10
- Certified
- 2021-11-10
Frequently asked questions
- What is Karen Simpson's NPI number?
- Karen Simpson's National Provider Identifier (NPI) is 1376544189, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Simpson's specialty?
- Karen Simpson is listed in the NPPES registry with a primary specialty of Dermatology Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Simpson located?
- Karen Simpson's practice location on file with NPPES is 955 W Imperial Hwy Ste 200, Brea, CA 92821-3812.
- What is Karen Simpson's phone number?
- The practice phone number listed in the NPPES registry for Karen Simpson is (714) 626-6310.
- Does Karen Simpson accept Medicare?
- Karen Simpson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Simpson's NPI active?
- Yes — Karen Simpson's NPI (1376544189) is active in the NPPES registry as of the last update on 2021-11-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.