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DR. THOMAS N. HWANG M.D.
NPI 1023033495
Ophthalmology in San Francisco, CA

Active since July 13, 2006PECOS EnrolledAccepts Medicare Assignment
400 PARNASSUS AVE # 344, SAN FRANCISCO, CA 94143(415) 353-2142(415) 476-0336 Get Directions Write a Review

NPPES record last updated: December 13, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Thomas N. Hwang M.d. NPPES

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

DR. THOMAS N. HWANG M.D. (NPI 1023033495) is an individual ophthalmology provider in San Francisco, California, licensed in California (H88457) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS and is a graduate of Stanford University School Of Medicine (2002).

NPPES Registry Identity

NPI1023033495
Entity TypeIndividualMale
Primary Taxonomy207W00000X
Provider Legal NameDR. THOMAS N. HWANGCredential: M.D.
Location Address400 PARNASSUS AVE # 344San Francisco, CA 94143-2202
Mailing Address1635 Divisadero St, Suite 625, Box 1821San Francisco, CA 94115-3036
Phone(415) 353-2142
Fax(415) 476-0336
Sole ProprietorNo
Medical School CMSStanford University School Of MedicineGraduated 2002
Enumeration DateJuly 13, 2006
Last NPPES UpdateDecember 13, 2021
✔ NPI 1023033495 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOphthalmologyAllopathic & Osteopathic Physicians
Taxonomy Code207W00000X
License✔ Licensed in CA · H88457
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.
400 PARNASSUS AVE # 344, San Francisco, CA 94143
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Other Identifiers 1

Medicaid00A847100CA

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. Thomas N. Hwang M.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.

PECOS PAC ID5890799845
PECOS Enrollment IDI20060905000276
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 Thomas Hwang reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Permanente Medical Group Inc
1.7 mi
Internal Medicine
2238 GEARY
San Francisco, CA 94116
  • Reassigned Medicare billing, California enrollment
  • 20,078 clinicians in this Medicare group
NPI 1841373800 (415) 833-2200

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 94143 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
$153.83 typical visit price
range $69.00 – $202.35
Typical copayment $38.45 (range $17.25 – $50.58)
Most-billed visit code 99204
Established Patient
$84.91 typical visit price
range $23.44 – $166.46
Typical copayment $21.22 (range $5.86 – $41.61)
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.

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 Thomas Hwang's NPI number?

The NPI number for Thomas Hwang is 1023033495. It was assigned to this individual provider in the NPPES registry on July 13, 2006.

Where is Thomas Hwang located?

Thomas Hwang practices at 400 Parnassus Ave # 344, San Francisco, CA 94143. The listed phone number is (415) 353-2142.

What is Thomas Hwang's specialty?

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

Is Thomas Hwang enrolled in Medicare?

Yes. Thomas Hwang 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 Thomas Hwang's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Thomas Hwang reassigns Medicare benefits to Permanente Medical Group Inc (San Francisco, 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 Thomas Hwang'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 Thomas Hwang was last updated on December 13, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.