David Mark, M.D.
NPI 1912900218 · Ophthalmology Physician · Sunnyvale, CA
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
David Mark, M.D. is a Ophthalmology Physician provider in Sunnyvale, CA (NPI 1912900218).
Provider details
- NPI number
- 1912900218
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G35305 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
21 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
622 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Complete Exam of Visual System92014 | 281 | $161 |
| Established Patient Problem Focused Exam of Visual System92012 | 124 | $115 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 66 | $111 |
| Imaging of Optic Nerve92133 | 58 | $45 |
| Exam of Visual Field With Extended Testing92083 | 40 | $83 |
| New Patient Complete Exam of Visual System92004 | 22 | $189 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 196 | 56 |
| Timolol Maleate | 65 | 15 |
| Tobramycin/Dexamethasonebrand: Tobramycin-Dexamethasone | 38 | 33 |
| Prednisolone Acetate | 32 | 24 |
| Brimonidine Tartrate | 14 | — |
| Tafluprost/Pfbrand: Tafluprost | 12 | — |
| Acyclovir | 12 | — |
| Dorzolamide Hcl/Timolol Maleat |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-05-31
- Last updated
- 2013-01-31
Frequently asked questions
- What is David Mark's NPI number?
- David Mark's National Provider Identifier (NPI) is 1912900218, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is David Mark's specialty?
- David Mark is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is David Mark located?
- David Mark's practice location on file with NPPES is 1010 W Fremont Ave, Sunnyvale, CA 94087-3019.
- What is David Mark's phone number?
- The practice phone number listed in the NPPES registry for David Mark is (408) 739-6200.
- Does David Mark accept Medicare?
- David Mark is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is David Mark's NPI active?
- Yes — David Mark's NPI (1912900218) is active in the NPPES registry as of the last update on 2013-01-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.