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DR. HOLLY NGUYEN DIEP MD
NPI 1164626214
Pediatrics in Harbor City, CA

Active since June 13, 2007PECOS Enrolled
25825 VERMONT AVE, HARBOR CITY, CA 90710(310) 325-5111 Get Directions Write a Review

NPPES record last updated: November 29, 2021. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Holly Nguyen Diep Md NPPES

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

DR. HOLLY NGUYEN DIEP MD (NPI 1164626214) is an individual pediatrics provider in Harbor City, California, licensed in California (A95539) and active in the NPI registry since June 2007. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1164626214
Entity TypeIndividualFemale
Primary Taxonomy208000000X
Provider Legal NameDR. HOLLY NGUYEN DIEPCredential: MD
Location Address25825 VERMONT AVEHarbor City, CA 90710-3518
Mailing Address25825 Vermont AveHarbor City, CA 90710-3518 · (310) 325-5111
Phone(310) 325-5111
Sole ProprietorNo
Enumeration DateJune 13, 2007
Last NPPES UpdateNovember 29, 2021
✔ NPI 1164626214 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians
Taxonomy Code208000000X
License✔ Licensed in CA · A95539
Definition
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
25825 VERMONT AVE, Harbor City, CA 90710
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Holly Nguyen Diep 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 Holly Diep reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Southern California Permanente Medical Group
Same address
Health Maintenance Organization
25825 VERMONT AVE
Harbor City, CA 90710
  • Reassigned Medicare billing, California enrollment
  • 13,921 clinicians in this Medicare group
NPI 1598797011 (310) 325-5111

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 90710 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
$96.36 typical visit price
range $62.96 – $187.60
Typical copayment $24.09 (range $15.74 – $46.90)
Most-billed visit code 99203
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 20

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

SEAN KOH PHARM.D.
Pharmacist
25825 VERMONT AVE
HARBOR CITY, CA 90710
Los Angeles County (310) 325-5111
ALYSSA QUAN PHARM.D.
Pharmacist
25825 VERMONT AVE
HARBOR CITY, CA 90710
Los Angeles County (310) 517-2238
JOYHAN JAY SUNG RRT-NPS
Respiratory Therapist, Registered (Neonatal/Pediatrics)
25825 VERMONT AVE
HARBOR CITY, CA 90710
Los Angeles County (310) 517-2648
RANDEL R. KING MD
Internal Medicine (Pulmonary Disease)
25825 VERMONT AVE
HARBOR CITY, CA 90710
Los Angeles County (310) 325-5111
TIM TAKESHI SUGIYAMA
Pharmacist
25825 VERMONT AVE
HARBOR CITY, CA 90710
Los Angeles County (310) 517-2239
RYOKEI K. IMAI MD
Internal Medicine
25825 VERMONT AVE
HARBOR CITY, CA 90710
Los Angeles County (310) 325-5111
JENNIFER WING-YUN LAM MD
Internal Medicine
25825 VERMONT AVE
HARBOR CITY, CA 90710
Los Angeles County (310) 325-5111
CHRISTOPHER LOLACHI MD
Otolaryngology (Plastic Surgery within the Head & Neck)
25825 VERMONT AVE
HARBOR CITY, CA 90710
Los Angeles County (310) 325-5111

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 Holly Diep's NPI number?

The NPI number for Holly Diep is 1164626214. It was assigned to this individual provider in the NPPES registry on June 13, 2007.

Where is Holly Diep located?

Holly Diep practices at 25825 Vermont Ave, Harbor City, CA 90710. The listed phone number is (310) 325-5111.

What is Holly Diep's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Is Holly Diep enrolled in Medicare?

Yes. Holly Diep is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Holly Diep's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Holly Diep reassigns Medicare benefits to Southern California Permanente Medical Group (Harbor City, 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 Holly Diep'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 Holly Diep was last updated on November 29, 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.