Mark Cohen, M.D.
NPI 1194845271 · Ophthalmology Physician · Castro Valley, CA
Enrolled with Medicare as Order and Referring Only - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Cohen, M.D. is a Ophthalmology Physician provider in Castro Valley, CA (NPI 1194845271).
Provider details
- NPI number
- 1194845271
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- C027491 (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
19 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
- 2007-03-30
- Last updated
- 2007-07-08
Frequently asked questions
- What is Mark Cohen's NPI number?
- Mark Cohen's National Provider Identifier (NPI) is 1194845271, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Cohen's specialty?
- Mark Cohen is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Cohen located?
- Mark Cohen's practice location on file with NPPES is 20046 Lake Chabot Rd, Castro Valley, CA 94546-5304.
- What is Mark Cohen's phone number?
- The practice phone number listed in the NPPES registry for Mark Cohen is (510) 881-8823.
- Does Mark Cohen accept Medicare?
- Mark Cohen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Cohen's NPI active?
- Yes — Mark Cohen's NPI (1194845271) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.