William Tang, M.D.
NPI 1972540177 · Ophthalmology Physician · Natick, MA
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Tang, M.D. is a Ophthalmology Physician provider in Natick, MA (NPI 1972540177).
Provider details
- NPI number
- 1972540177
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 153637 (MA)
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
5,301 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) |
|---|---|---|
| Injection of Drug Into Eye67028 | 1,440 | $143 |
| Imaging of Retina92134 | 1,063 | $46 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 813 | $102 |
| Photography of the Retina92250 | 730 | $42 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 654 | $144 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 217 | $187 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 313 | 74 |
| Brimonidine Tartrate | 135 | 62 |
| Timolol Maleate | 128 | 53 |
| Prednisolone Acetate | 107 | 76 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 73 | 17 |
| Bromfenac Sodium | 71 | 26 |
| Dorzolamide Hcl | 70 | 21 |
| Atropine Sulfate | 65 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$47 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
- 2006-05-31
- Last updated
- 2021-11-21
- Certified
- 2021-11-21
Frequently asked questions
- What is William Tang's NPI number?
- William Tang's National Provider Identifier (NPI) is 1972540177, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Tang's specialty?
- William Tang is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is William Tang located?
- William Tang's practice location on file with NPPES is 182 W Central St Ste 102, Natick, MA 01760-3756.
- What is William Tang's phone number?
- The practice phone number listed in the NPPES registry for William Tang is (508) 903-0003.
- Does William Tang accept Medicare?
- William Tang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Tang's NPI active?
- Yes — William Tang's NPI (1972540177) is active in the NPPES registry as of the last update on 2021-11-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.