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DR. ANDREW TIEN DUONG MD
NPI 1629711981
Ophthalmology in San Rafael, CA

Active since April 15, 2022PECOS Enrolled
901 E ST STE 285, SAN RAFAEL, CA 94901(415) 454-5565 Get Directions Write a Review

NPPES record last updated: August 5, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Aug 5, 2026, Apr 15, 2022 (2 updates tracked since 2022).

About Dr. Andrew Tien Duong Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. ANDREW TIEN DUONG MD (NPI 1629711981) is an individual ophthalmology provider in San Rafael, California, licensed in California (A188370) and active in the NPI registry since April 2022. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1629711981
Entity TypeIndividualMale
Primary Taxonomy207W00000X
Provider Legal NameDR. ANDREW TIEN DUONGCredential: MD
Location Address901 E ST STE 285San Rafael, CA 94901-2850
Mailing Address901 E St Ste 285San Rafael, CA 94901-2850 · (415) 454-5565 · Fax (415) 454-2957
Phone(415) 454-5565
Sole ProprietorYes
Enumeration DateApril 15, 2022
Last NPPES UpdateAugust 5, 20262 updates tracked since enumeration
NPPES CertifiedAugust 5, 2026
✔ NPI 1629711981 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOphthalmologyAllopathic & Osteopathic Physicians
Taxonomy Code207W00000X
License✔ Licensed in CA · A188370
Definition
An ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual disorders. This includes problems affecting the eye and its component structures, the eyelids, the orbit and the visual pathways. In so doing, an ophthalmologist prescribes vision services, including glasses and contact lenses.
901 E ST STE 285, San Rafael, CA 94901
Open in Google Maps ↗

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Andrew Tien Duong Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Andrew Duong reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Marin Ophthalmic Consultants, A Medical Corporation
1.6 mi
Specialist
901 E ST, STE 285
San Rafael, CA 94901
  • Reassigned Medicare billing, California enrollment
  • 6 clinicians in this Medicare group
NPI 1447253919 (415) 454-5565

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94901 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$154.04 typical visit price
range $69.07 – $202.63
Typical copayment $38.51 (range $17.26 – $50.65)
Most-billed visit code 99204
Established Patient
$85.00 typical visit price
range $23.44 – $166.64
Typical copayment $21.25 (range $5.86 – $41.66)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MARIN OPHTHALMIC GALLARY
Durable Medical Equipment & Medical Supplies
901 E ST STE 285
SAN RAFAEL, CA 94901
Marin County (415) 460-6263

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 Andrew Duong's NPI number?

The NPI number for Andrew Duong is 1629711981. It was assigned to this individual provider in the NPPES registry on April 15, 2022.

Where is Andrew Duong located?

Andrew Duong practices at 901 E St Ste 285, San Rafael, CA 94901. The listed phone number is (415) 454-5565.

What is Andrew Duong's specialty?

The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.

Is Andrew Duong enrolled in Medicare?

Yes. Andrew Duong is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Andrew Duong's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Andrew Duong reassigns Medicare benefits to Marin Ophthalmic Consultants, A Medical Corporation (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 Andrew Duong's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Andrew Duong was last updated on August 5, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months 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.