What is Donald Nielsen's NPI number?

Donald Nielsen's National Provider Identifier (NPI) is 1992686075, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Donald Nielsen's specialty?

Donald Nielsen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).

Where is Donald Nielsen located?

Donald Nielsen's practice location on file with NPPES is 195 Oxford Ct, Alamo, CA 94507-1753.

What is Donald Nielsen's phone number?

The practice phone number listed in the NPPES registry for Donald Nielsen is (925) 933-4710.

Is Donald Nielsen's NPI active?

Yes — Donald Nielsen's NPI (1992686075) is active in the NPPES registry as of the last update on 2025-09-08.

IndividualActive

Donald Nielsen, MD

NPI 1992686075 · Internal Medicine Physician · Alamo, CA

Donald Nielsen, MD is a Internal Medicine Physician provider in Alamo, CA (NPI 1992686075).

Provider details

NPI number: 1992686075
Entity type: Individual
Primary specialty: Internal Medicine PhysicianAllopathic & Osteopathic Physicians
Credential: MD
Sex: Male
Sole proprietor: Yes
License: G36555 (CA)

Specialties & taxonomies

Internal Medicine PhysicianPrimary207R00000XLicense G36555 (CA)
Allopathic & Osteopathic Physicians

Profile Score

Established profile(54/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
Under 1 yr in 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

195 Oxford Ct

Alamo, CA 94507-1753

Phone: (925) 933-4710

Street-level locationGet directions

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Mailing address