Lilly Chang, OD
NPI 1619521259 · Optometrist · Sonoma, CA
Enrolled with Medicare as Practitioner - Optometry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Lilly Chang, OD is a Optometrist provider in Sonoma, CA (NPI 1619521259).
Provider details
- NPI number
- 1619521259
- Entity type
- Individual
- Primary specialty
- OptometristEye and Vision Services Providers
- Credential
- OD
- Sex
- Female
- Sole proprietor
- No
- License
- 34315TLG (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 tenure28% of score
6 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
3,330 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 | 1,359 | $152 |
| New Patient Complete Exam of Visual System92004 | 1,298 | $177 |
| Established Patient Problem Focused Exam of Visual System92012 | 459 | $110 |
| New Patient Problem Focused Exam of Visual System92002 | 202 | $104 |
| Photography of the Retina92250 | 12 | $42 |
Typical Medicare-allowed amounts for these services range $42–$177 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2019-07-31
- Last updated
- 2020-10-27
- Certified
- 2020-10-27
Frequently asked questions
- What is Lilly Chang's NPI number?
- Lilly Chang's National Provider Identifier (NPI) is 1619521259, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Lilly Chang's specialty?
- Lilly Chang is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
- Where is Lilly Chang located?
- Lilly Chang's practice location on file with NPPES is 201 W Napa St Ste 3, Sonoma, CA 95476-6621.
- What is Lilly Chang's phone number?
- The practice phone number listed in the NPPES registry for Lilly Chang is (707) 938-3937.
- Does Lilly Chang accept Medicare?
- Lilly Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Lilly Chang's NPI active?
- Yes — Lilly Chang's NPI (1619521259) is active in the NPPES registry as of the last update on 2020-10-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.