Stephen C. Siegle, M.D.
Internal Medicine Physician · Torrance, CA
Stephen C. Siegle, M.D. is an internal medicine physician with a practice address in Torrance, California, and NPI 1821055302, issued on Apr 27, 2006. Check the license (California A40032, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Stephen C. Siegle
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A40032 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4320 Maricopa St, Torrance, CA 90503
- Phone
- (310) 214-0811
- Enumerated
- Apr 27, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (310) 303-5901
- Entity
- Type 1 · individual
Also registered at 4320 Maricopa St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Stephen C. Siegle in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A40032Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
62 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Latanoprost13 claims
- Atorvastatin Calcium12 claims
- Brimonidine Tartrate12 claims
- Gabapentin12 claims
- Losartan Potassium12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
231 internal medicine physician records list a practice address in Torrance
They are 231 of the 8,901 NPPES records with a practice address in Torrance, and 17,696 internal medicine physician records in California.
All 231 in Torrance → All 17,696 in California → Every provider in Torrance →
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Common questions
What is Stephen C. Siegle, M.D.'s NPI number?
Stephen C. Siegle, M.D.'s National Provider Identifier (NPI) is 1821055302, issued on Apr 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stephen C. Siegle, M.D. located?
The NPPES record lists a practice address at 4320 Maricopa St, Torrance, CA, 90503. Phone: (310) 214-0811. Providers update this record themselves, so call before visiting.
How can I verify Stephen C. Siegle, M.D.'s license?
NPPES lists California license number A40032, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Stephen C. Siegle, M.D. prescribe under Medicare Part D?
In 2024, Stephen C. Siegle, M.D. had 62 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.