DR. LILLY CHANG OD
NPI 1619521259
Optometrist in Mountain View, CA
About Dr. Lilly Chang Od NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. LILLY CHANG OD (NPI 1619521259) is an individual optometrist in Mountain View, California, licensed in California (34315TLG) and active in the NPI registry since July 2019. She is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. Lilly Chang Od is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
4Medicare enrollment records show Lilly Chang reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Hayward, CA 94545
- Reassigned Medicare billing, California enrollment
- 2 clinicians in this Medicare group
San Leandro, CA 94577
- Reassigned Medicare billing, California enrollment
- 5 clinicians in this Medicare group
Sonoma, CA 95476
- Reassigned Medicare billing, California enrollment
- 3 clinicians in this Medicare group
Glendale, CA 91203
- Reassigned Medicare billing, California enrollment
- 20 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 5
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94035 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Lilly Chang's NPI number?
The NPI number for Lilly Chang is 1619521259. It was assigned to this individual provider in the NPPES registry on July 31, 2019.
Where is Lilly Chang located?
Lilly Chang practices at 680 Macon Rd, Mountain View, CA 94035. The listed phone number is (650) 603-8766.
What is Lilly Chang's specialty?
The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.
Is Lilly Chang enrolled in Medicare?
Yes. Lilly Chang is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Lilly Chang's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Lilly Chang reassigns Medicare benefits to 4 organizations: Bhakta Optometric, PC (Hayward, CA), Flores Optometry Inc (San Leandro, CA), Kevin P & Laura L Martin (Sonoma, CA) and Greta Torossian, Optometric Corp. (Glendale, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Lilly Chang's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Lilly Chang accept?
Health plans from Anthem Blue Cross and Blue Shield, Blue Cross and Blue Shield of Montana, Blue Cross and Blue Shield of Oklahoma, Blue Cross and Blue Shield of Texas and Providence Health Plan list Lilly Chang as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Lilly Chang was last updated on August 27, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 54 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Lilly Chang, OD · NPI 1619521259
Optometrist provider in Mountain View, California. Individual provider, active in the CMS NPPES registry since July 31, 2019.
## Identity
- **NPI:** 1619521259 (Entity type: Individual)
- **Enumerated:** July 31, 2019
- **Primary specialty:** Optometrist · taxonomy 152W00000X
- **State license:** 34315TLG (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 680 MACON RD, Mountain View, CA 94035-1005
- **Phone:** (650) 603-8766
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Bhakta Optometric, PC (NPI 1174972269, Hayward, CA); Flores Optometry Inc (NPI 1326365032, San Leandro, CA); Kevin P & Laura L Martin (NPI 1043541857, Sonoma, CA); Greta Torossian, Optometric Corp. (NPI 1821152273, Glendale, CA) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** August 27, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1619521259) · Data from the CMS NPPES public registry.