Michael Nielsen, MD
NPI 1255301370 · Emergency Medicine Physician · San Diego, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Nielsen, MD is a Emergency Medicine Physician provider in San Diego, CA (NPI 1255301370).
Provider details
- NPI number
- 1255301370
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- A79412 (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
20 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
- 2006-01-23
- Last updated
- 2010-02-04
Frequently asked questions
- What is Michael Nielsen's NPI number?
- Michael Nielsen's National Provider Identifier (NPI) is 1255301370, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Nielsen's specialty?
- Michael Nielsen is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Nielsen located?
- Michael Nielsen's practice location on file with NPPES is 200 W Arbor Dr, San Diego, CA 92103-9001.
- What is Michael Nielsen's phone number?
- The practice phone number listed in the NPPES registry for Michael Nielsen is (619) 543-6236.
- Does Michael Nielsen accept Medicare?
- Michael Nielsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Nielsen's NPI active?
- Yes — Michael Nielsen's NPI (1255301370) is active in the NPPES registry as of the last update on 2010-02-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.