Fang Tan, MD
NPI 1811997646 · Ophthalmology Physician · Fremont, CA
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Fang Tan, MD is a Ophthalmology Physician provider in Fremont, CA (NPI 1811997646).
Provider details
- NPI number
- 1811997646
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A81026 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
2,242 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Photography of the Retina92250 | 667 | $47 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 584 | $154 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 286 | $110 |
| Exam of the Internal Drainage System of Eye92020 | 281 | $34 |
| Exam of Visual Field With Extended Testing92083 | 143 | $82 |
| Established Patient Complete Exam of Visual System92014 | 113 | $159 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 17 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Azelastine Hcl | 271 | 102 |
| Latanoprost | 248 | 74 |
| Brimonidine Tartrate | 100 | 28 |
| Cyclosporine | 94 | 41 |
| Erythromycin Basebrand: Erythromycin | 82 | 54 |
| Timolol Maleate | 81 | 22 |
| Bimatoprostbrand: Lumigan | 64 | 15 |
| Cyclosporinebrand: Restasis |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$73 across 3 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
- 2005-07-22
- Last updated
- 2008-01-07
Frequently asked questions
- What is Fang Tan's NPI number?
- Fang Tan's National Provider Identifier (NPI) is 1811997646, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Fang Tan's specialty?
- Fang Tan is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Fang Tan located?
- Fang Tan's practice location on file with NPPES is 1895 Mowry Ave, Fremont, CA 94538-1737.
- What is Fang Tan's phone number?
- The practice phone number listed in the NPPES registry for Fang Tan is (510) 793-2800.
- Does Fang Tan accept Medicare?
- Fang Tan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Fang Tan's NPI active?
- Yes — Fang Tan's NPI (1811997646) is active in the NPPES registry as of the last update on 2008-01-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.