Michael a Amster, MD Professional Corporation
NPI 1558695064 · Family Medicine Physician · Fairfield, CA
Michael a Amster, MD Professional Corporation is a Family Medicine Physician organization in Fairfield, CA (NPI 1558695064).
Provider details
- NPI number
- 1558695064
- Entity type
- Organization
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Elizabeth Williams, Manager(209) 322-3301
- License
- A81550 (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
16 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
- 2009-09-30
- Last updated
- 2009-09-30
Frequently asked questions
- What is Michael a Amster, MD Professional Corporation's NPI number?
- Michael a Amster, MD Professional Corporation's National Provider Identifier (NPI) is 1558695064, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Michael a Amster, MD Professional Corporation?
- Michael a Amster, MD Professional Corporation is classified in the NPPES registry as Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael a Amster, MD Professional Corporation located?
- Michael a Amster, MD Professional Corporation's practice location on file with NPPES is 1101 B Gale Wilson Blvd, Fairfield, CA 94533-3700.
- What is Michael a Amster, MD Professional Corporation's phone number?
- The practice phone number listed in the NPPES registry for Michael a Amster, MD Professional Corporation is (707) 429-7766.
- Who is the authorized official for Michael a Amster, MD Professional Corporation?
- The authorized official listed on Michael a Amster, MD Professional Corporation's NPPES record is Elizabeth Williams, Manager. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Michael a Amster, MD Professional Corporation's NPI active?
- Yes — Michael a Amster, MD Professional Corporation's NPI (1558695064) is active in the NPPES registry as of the last update on 2009-09-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.