Ernest Chang, OD
NPI 1235786898 · Optometrist · Woodland, CA
Enrolled with Medicare as Practitioner - Optometry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ernest Chang, OD is a Optometrist provider in Woodland, CA (NPI 1235786898).
Provider details
- NPI number
- 1235786898
- Entity type
- Individual
- Primary specialty
- OptometristEye and Vision Services Providers
- Credential
- OD
- Sex
- Male
- Sole proprietor
- No
- License
- 34341 (CA)
Specialties & taxonomies
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
6 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
368 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 | 69 | $136 |
| New Patient Complete Exam of Visual System92004 | 68 | $95 |
| Established Patient Complete Exam of Visual System92014 | 66 | $76 |
| New Patient Complete Exam of Visual System92004 | 34 | $161 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 23 | $67 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 21 | $96 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$445 across 4 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
- 2019-08-19
- Last updated
- 2019-08-23
Frequently asked questions
- What is Ernest Chang's NPI number?
- Ernest Chang's National Provider Identifier (NPI) is 1235786898, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ernest Chang's specialty?
- Ernest Chang is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
- Where is Ernest Chang located?
- Ernest Chang's practice location on file with NPPES is 421 Pioneer Ave, Woodland, CA 95776-4948.
- What is Ernest Chang's phone number?
- The practice phone number listed in the NPPES registry for Ernest Chang is (530) 661-0300.
- Does Ernest Chang accept Medicare?
- Ernest Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ernest Chang's NPI active?
- Yes — Ernest Chang's NPI (1235786898) is active in the NPPES registry as of the last update on 2019-08-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.