Mark E Eastham M D a Professional Corporation
NPI 1821227562 · Neurological Surgery Physician · Greenbrae, CA
Mark E Eastham M D a Professional Corporation is a Neurological Surgery Physician organization in Greenbrae, CA (NPI 1821227562).
Provider details
- NPI number
- 1821227562
- Entity type
- Organization
- Primary specialty
- Neurological Surgery PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Mark Eastham, Medical Director(408) 315-1814
- License
- G65379 (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
- 2009-07-02
- Last updated
- 2009-07-17
Frequently asked questions
- What is Mark E Eastham M D a Professional Corporation's NPI number?
- Mark E Eastham M D a Professional Corporation's National Provider Identifier (NPI) is 1821227562, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Mark E Eastham M D a Professional Corporation?
- Mark E Eastham M D a Professional Corporation is classified in the NPPES registry as Neurological Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Mark E Eastham M D a Professional Corporation located?
- Mark E Eastham M D a Professional Corporation's practice location on file with NPPES is 250 Bon Air Rd, Greenbrae, CA 94904-1702.
- What is Mark E Eastham M D a Professional Corporation's phone number?
- The practice phone number listed in the NPPES registry for Mark E Eastham M D a Professional Corporation is (415) 925-7220.
- Who is the authorized official for Mark E Eastham M D a Professional Corporation?
- The authorized official listed on Mark E Eastham M D a Professional Corporation's NPPES record is Mark Eastham, Medical Director. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Mark E Eastham M D a Professional Corporation's NPI active?
- Yes — Mark E Eastham M D a Professional Corporation's NPI (1821227562) is active in the NPPES registry as of the last update on 2009-07-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.