DR. DARWIN C TSANG O.D.
NPI 1619344918
Optometrist in Petaluma, CA
About Dr. Darwin C Tsang O.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. DARWIN C TSANG O.D. (NPI 1619344918) is an individual optometrist in Petaluma, California, licensed in California (15225 TLG) and active in the NPI registry since August 2015. He is enrolled in Medicare PECOS and is a graduate of New England College Of Optometry (2015).
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 and accepts Medicare assignment
Dr. Darwin C Tsang O.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Darwin Tsang reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
San Rafael, CA 94901
- Reassigned Medicare billing, California enrollment
- 2 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 94952 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 8
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 Darwin Tsang's NPI number?
The NPI number for Darwin Tsang is 1619344918. It was assigned to this individual provider in the NPPES registry on August 21, 2015.
Where is Darwin Tsang located?
Darwin Tsang practices at 401 Kenilworth Dr Inside Target Optical, Petaluma, CA 94952. The listed phone number is (707) 775-6022.
What is Darwin Tsang's specialty?
The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.
Is Darwin Tsang enrolled in Medicare?
Yes. Darwin Tsang is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Darwin Tsang's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Darwin Tsang reassigns Medicare benefits to Marin Optometric Group, Inc (San Rafael, CA). The 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 Darwin Tsang's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Darwin Tsang 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 Darwin Tsang 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 Darwin Tsang was last updated on September 23, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 years 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. Darwin C Tsang, O.D. · NPI 1619344918
Optometrist provider in Petaluma, California. Individual provider, active in the CMS NPPES registry since August 21, 2015.
## Identity
- **NPI:** 1619344918 (Entity type: Individual)
- **Enumerated:** August 21, 2015
- **Primary specialty:** Optometrist · taxonomy 152W00000X
- **State license:** 15225 TLG (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 401 KENILWORTH DR, INSIDE TARGET OPTICAL, Petaluma, CA 94952-3400
- **Phone:** (707) 775-6022 · **Fax:** (707) 782-0568
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health
- **Bills Medicare through:** Marin Optometric Group, Inc (NPI 1437632429, San Rafael, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** New England College Of Optometry, class of 2015
## Record status
- **NPPES last updated:** September 23, 2016
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Source: [NPI Profile](https://npiprofile.com/npi/1619344918) · Data from the CMS NPPES public registry.