Diana Chao, MD
NPI 1528320298 · Ophthalmology Physician · San Gabriel, CA
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Diana Chao, MD is a Ophthalmology Physician provider in San Gabriel, CA (NPI 1528320298).
Provider details
- NPI number
- 1528320298
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A135726 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
14 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
750 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 223 | $139 |
| Established Patient Complete Exam of Visual System92014 | 140 | $140 |
| Imaging of Optic Nerve92133 | 140 | $40 |
| Imaging of Retina92134 | 96 | $44 |
| Exam of Visual Field With Extended Testing92083 | 93 | $71 |
| New Patient Complete Exam of Visual System92004 | 43 | $164 |
| Ultrasound Scan of Cornea to Determine Thickness |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 23 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 1,116 | 246 |
| Brimonidine Tartrate | 542 | 170 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 478 | 145 |
| Prednisolone Acetate | 193 | 113 |
| Timolol Maleate | 178 | 52 |
| Netarsudil Mesylat/Latanoprostbrand: Rocklatan | 108 | 34 |
| Bimatoprostbrand: Lumigan | 106 | 22 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$353 across 11 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
- 2012-06-08
- Last updated
- 2026-01-19
- Certified
- 2026-01-19
Frequently asked questions
- What is Diana Chao's NPI number?
- Diana Chao's National Provider Identifier (NPI) is 1528320298, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diana Chao's specialty?
- Diana Chao is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Diana Chao located?
- Diana Chao's practice location on file with NPPES is 7232 Rosemead Blvd Ste 202, San Gabriel, CA 91775-1389.
- What is Diana Chao's phone number?
- The practice phone number listed in the NPPES registry for Diana Chao is (626) 534-6698.
- Does Diana Chao accept Medicare?
- Diana Chao is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Diana Chao's NPI active?
- Yes — Diana Chao's NPI (1528320298) is active in the NPPES registry as of the last update on 2026-01-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.