Mark Nagy, MD, PHD
NPI 1811637945 · Ophthalmology Physician · San Francisco, CA
Enrolled with Medicare as Order and Referring Only - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Nagy, MD, PHD is a Ophthalmology Physician provider in San Francisco, CA (NPI 1811637945).
Provider details
- NPI number
- 1811637945
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, PHD
- Sex
- Male
- Sole proprietor
- No
- License
- A188894 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
4 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$125 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2022-03-29
- Last updated
- 2026-04-16
- Certified
- 2026-04-16
Frequently asked questions
- What is Mark Nagy's NPI number?
- Mark Nagy's National Provider Identifier (NPI) is 1811637945, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Nagy's specialty?
- Mark Nagy is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Nagy located?
- Mark Nagy's practice location on file with NPPES is 490 Illinois Street, 5th Floor, San Francisco, CA 94158.
- What is Mark Nagy's phone number?
- The practice phone number listed in the NPPES registry for Mark Nagy is (415) 353-2020.
- Does Mark Nagy accept Medicare?
- Mark Nagy is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Nagy's NPI active?
- Yes — Mark Nagy's NPI (1811637945) is active in the NPPES registry as of the last update on 2026-04-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.