Aileen Guillen, MD
NPI 1427753946 · Emergency Medicine Physician · Torrance, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Aileen Guillen, MD is a Emergency Medicine Physician provider in Torrance, CA (NPI 1427753946).
Provider details
- NPI number
- 1427753946
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- Yes
- License
- 200783 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
3 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2023-04-03
- Last updated
- 2025-09-04
- Certified
- 2025-09-04
Frequently asked questions
- What is Aileen Guillen's NPI number?
- Aileen Guillen's National Provider Identifier (NPI) is 1427753946, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Aileen Guillen's specialty?
- Aileen Guillen is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Aileen Guillen located?
- Aileen Guillen's practice location on file with NPPES is 1000 W Carson St Bldg N-14, Torrance, CA 90502-2004.
- What is Aileen Guillen's phone number?
- The practice phone number listed in the NPPES registry for Aileen Guillen is (424) 306-5400.
- Does Aileen Guillen accept Medicare?
- Aileen Guillen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Aileen Guillen's NPI active?
- Yes — Aileen Guillen's NPI (1427753946) is active in the NPPES registry as of the last update on 2025-09-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.