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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. STEPHEN C SIEGLE M.D.
NPI 1821055302
Internal Medicine in Torrance, CA

Active since April 27, 2006PECOS Enrolled
4320 MARICOPA ST, TORRANCE, CA 90503(310) 214-0811(310) 303-5901 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. Stephen C Siegle M.d. NPPES

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

DR. STEPHEN C SIEGLE M.D. (NPI 1821055302) is an individual internal medicine provider in Torrance, California, licensed in California (A40032) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1821055302
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. STEPHEN C SIEGLECredential: M.D.
Location Address4320 MARICOPA STTorrance, CA 90503-4314
Mailing Address3330 Lomita BlvdTorrance, CA 90505-5002 · (310) 214-0811 · Fax (310) 303-5901
Phone(310) 214-0811
Fax(310) 303-5901
Sole ProprietorNo
Enumeration DateApril 27, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1821055302 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 · A40032
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.
4320 MARICOPA ST, Torrance, CA 90503
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Stephen C Siegle 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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90503 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 10

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

LITTLE COMPANY OF MARY HOSPITAL
Skilled Nursing Facility
4320 MARICOPA ST
TORRANCE, CA 90503
Los Angeles County (310) 303-7496
SAROJ BHARATIYA MD, PC
Internal Medicine
4320 MARICOPA ST
TORRANCE, CA 90503
Los Angeles County (310) 303-5900
ASK DO INC
Physical Medicine & Rehabilitation
4320 MARICOPA ST
TORRANCE, CA 90503
Los Angeles County (310) 303-5900
MR. RAYMOND CARLOS ABAGAT FNP
Nurse Practitioner (Family)
4320 MARICOPA ST
TORRANCE, CA 90503
Los Angeles County (310) 804-0948
DR. SAROJ BHARATIYA M.D.
Internal Medicine
4320 MARICOPA ST
TORRANCE, CA 90503
Los Angeles County (310) 303-5900
JONATHAN LIANG DO INC
Physical Medicine & Rehabilitation
4320 MARICOPA ST
TORRANCE, CA 90503
Los Angeles County (562) 424-1011
DR. JONATHAN LEE LIANG DO
Physical Medicine & Rehabilitation
4320 MARICOPA ST
TORRANCE, CA 90503
Los Angeles County (562) 424-1011
DAVID UNDERHILL, MD INC
Physical Medicine & Rehabilitation
4320 MARICOPA ST
TORRANCE, CA 90503
Los Angeles County (310) 303-5900

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 Stephen Siegle's NPI number?

The NPI number for Stephen Siegle is 1821055302. It was assigned to this individual provider in the NPPES registry on April 27, 2006.

Where is Stephen Siegle located?

Stephen Siegle practices at 4320 Maricopa St, Torrance, CA 90503. The listed phone number is (310) 214-0811.

What is Stephen Siegle's specialty?

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

Is Stephen Siegle enrolled in Medicare?

Yes. Stephen Siegle is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Stephen Siegle was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 32 days 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.