Aileen Chang, O.D.
NPI 1356781785 · Optometrist · Sunnyvale, CA
Enrolled with Medicare as Practitioner - Optometry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Aileen Chang, O.D. is a Optometrist provider in Sunnyvale, CA (NPI 1356781785).
Provider details
- NPI number
- 1356781785
- Entity type
- Individual
- Primary specialty
- OptometristEye and Vision Services Providers
- Credential
- O.D.
- Sex
- Female
- Sole proprietor
- No
- License
- TUV007978 (NY)
Specialties & taxonomies
Eye and Vision Services Providers
Eye and Vision Services Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
12 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
765 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 Complete Exam of Visual System92014 | 173 | $160 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 160 | $111 |
| Imaging of Optic Nerve92133 | 127 | $46 |
| Exam of Visual Field With Extended Testing92083 | 91 | $83 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 60 | $154 |
| New Patient Complete Exam of Visual System92004 | 34 | $185 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 247 | 53 |
| Timolol Maleate | 42 | 12 |
| Bimatoprostbrand: Lumigan | 40 | — |
| Dorzolamide Hcl | 19 | — |
| Cyclosporinebrand: Restasis | 18 | — |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 17 | — |
| Erythromycin Basebrand: Erythromycin | 13 | 12 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$408 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
- 2013-06-30
- Last updated
- 2020-02-19
- Certified
- 2020-02-19
Frequently asked questions
- What is Aileen Chang's NPI number?
- Aileen Chang's National Provider Identifier (NPI) is 1356781785, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Aileen Chang's specialty?
- Aileen Chang is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
- Where is Aileen Chang located?
- Aileen Chang's practice location on file with NPPES is 1085 W El Camino Real, Sunnyvale, CA 94087-1030.
- What is Aileen Chang's phone number?
- The practice phone number listed in the NPPES registry for Aileen Chang is (408) 524-5900.
- Does Aileen Chang accept Medicare?
- Aileen Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Aileen Chang's NPI active?
- Yes — Aileen Chang's NPI (1356781785) is active in the NPPES registry as of the last update on 2020-02-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.