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DIANA HUI-MIN HSU M.D.
NPI 1720090137
Internal Medicine in Downey, CA

Active since August 13, 2006PECOS Enrolled
12651 LAKEWOOD BLVD, DOWNEY, CA 90242(562) 861-3111(562) 861-9721 Get Directions Write a Review

NPPES record last updated: April 9, 2008. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Diana Hui-min Hsu M.d. NPPES

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

DIANA HUI-MIN HSU M.D. (NPI 1720090137) is an individual internal medicine provider in Downey, California, licensed in California (A62369) and active in the NPI registry since August 2006. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1720090137
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameDIANA HUI-MIN HSUCredential: M.D.
Location Address12651 LAKEWOOD BLVDDowney, CA 90242-4563
Mailing Address12651 Lakewood BlvdDowney, CA 90242-4563 · (562) 861-3111 · Fax (562) 861-9721
Phone(562) 861-3111
Fax(562) 861-9721
Sole ProprietorNo
Enumeration DateAugust 13, 2006
Last NPPES UpdateApril 9, 2008
✔ NPI 1720090137 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A62369
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
12651 LAKEWOOD BLVD, Downey, CA 90242
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Other Identifiers 3

OtherW15800CA · Coporation Group Number
Medicare PINWA62369BCA
Medicare UPINH10905CA

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Diana Hui-min Hsu M.d. 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 Diana Hsu reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Imperial Family Medical Group, A Professional Corp
Same address
Internal Medicine
12651 LAKEWOOD BLVD
Downey, CA 90242
  • Reassigned Medicare billing, California enrollment
  • 2 clinicians in this Medicare group
NPI 1366454639 (562) 861-3111

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 90242 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
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
Most-billed visit code 99214
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 5

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

YING WU DDS
Dentist
12651 LAKEWOOD BLVD, #101
DOWNEY, CA 90242
Los Angeles County (562) 904-1150
YING WU D.D.S.,INC.
Dentist
12651 LAKEWOOD BLVD, 101
DOWNEY, CA 90242
Los Angeles County (562) 904-1150
ZHIYU ZHOU
Dental Hygienist
12651 LAKEWOOD BLVD, #101
DOWNEY, CA 90242
Los Angeles County (562) 904-1150
IMPERIAL FAMILY MEDICAL GROUP, A PROFESSIONAL CORP
Internal Medicine
12651 LAKEWOOD BLVD
DOWNEY, CA 90242
Los Angeles County (562) 861-3111
GOETHE ISSAC HSU M.D.
Internal Medicine
12651 LAKEWOOD BLVD
DOWNEY, CA 90242
Los Angeles County (562) 861-3111

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 Diana Hsu's NPI number?

The NPI number for Diana Hsu is 1720090137. It was assigned to this individual provider in the NPPES registry on August 13, 2006.

Where is Diana Hsu located?

Diana Hsu practices at 12651 Lakewood Blvd, Downey, CA 90242. The listed phone number is (562) 861-3111.

What is Diana Hsu's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Diana Hsu enrolled in Medicare?

Yes. Diana Hsu is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Diana Hsu's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Diana Hsu reassigns Medicare benefits to Imperial Family Medical Group, A Professional Corp (Downey, 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 Diana Hsu'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 Diana Hsu was last updated on April 9, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.