NPPES file of Aug 9, 2026

Simin Siddiq, M.D.

Internal Medicine Physician · Fremont, CA

Simin Siddiq, M.D. is an internal medicine physician with a practice address in Fremont, California, and NPI 1255362422, issued on Jul 6, 2006. Check the license (California A38666, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1255362422
Name
Simin Siddiq
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
A38666 CA
Self-reported in NPPES; status is on the state search
Practice location
2333 Mowry Ave, Fremont, CA 94538
Phone
(510) 796-0222
Enumerated
Jul 6, 2006
Record last updated
Apr 15, 2010 (not updated in 16 years: call before relying on the address or phone)
Fax
(510) 796-7760
Medicaid ID
00A38666 CA
Medicare enrollment
Enrolled (PECOS I20050428000533); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →

Also registered at 2333 Mowry Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Carl Carlson, M.D.Cardiovascular Disease Physician1386669489
  2. Christine Elias, M.D.Rheumatology Physician1972732600
  3. Caroline Garcia, MDFamily Medicine Physician1922114180
  4. Georgann Gervasi-Lyttkens, PA-C, R.D.C.S.,R.V.TMedical Physician Assistant1295952034
  5. Sylvia Hoang, M.D.Family Medicine Physician1760549109
  6. Frank Hochman, M.D.Family Medicine Physician1114016292

Verify Simin Siddiq in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A38666    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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39% fewer Medicare Part D claims than the average internal medicine physician in 2024

1,935 Medicare Part D claims for 167 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.

  1. Simin Siddiq1,935
  2. Specialty average3,176

Most prescribed

  1. Amlodipine Besylate181 claims
  2. Metformin Hcl128 claims
  3. Simvastatin118 claims
  4. Losartan Potassium109 claims
  5. Levothyroxine Sodium102 claims
  6. Atorvastatin Calcium81 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.

Industry payments in 2024: $62.49

3 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Pharmaceuticals, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Simin Siddiq$62.49
  2. Specialty average$1,303.06

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through one group practice

  1. California Cardiovascular ConsultantsFremont, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Simin Siddiq among 17,696 internal medicine physician records in California

Simin Siddiq, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.

  • NPI issued2006 · 5% of these records are older, 56% newer
  • In a Medicare fileYes · 79% of these records are
  • In the CMS Doctors and Clinicians fileYes · 63% of these records are
  • Graduated1977 · median 2004 among the 11,065 with a school on file
  • Record last updated2010 · 61% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

125 internal medicine physician records list a practice address in Fremont

They are 125 of the 4,749 NPPES records with a practice address in Fremont, and 17,696 internal medicine physician records in California.

All 17,696 in California → Every provider in Fremont → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. Zulfiqar Ali, M.DFremont, CA 945381093740227
  2. Bala Annadurai, M.D.Fremont, CA 945381033100516
  3. Ashwani Bindal, MDFremont, CA 945381265406318
  4. Yih Chang, M.D.Fremont, CA 945381174506380
  5. John Giddens, MDFremont, CA 945381417934803
  6. Satyasree Konda, M.D.Fremont, CA 945381306880679
  7. Padmavathi Kudaravalli, MDFremont, CA 945381144221953
  8. Suresh Mahawar, MDFremont, CA 945381033154893

Common questions

What is Simin Siddiq, M.D.'s NPI number?

Simin Siddiq, M.D.'s National Provider Identifier (NPI) is 1255362422, issued on Jul 6, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Simin Siddiq, M.D. located?

The NPPES record lists a practice address at 2333 Mowry Ave, Fremont, CA, 94538. Phone: (510) 796-0222. Providers update this record themselves, so call before visiting.

How can I verify Simin Siddiq, M.D.'s license?

NPPES lists California license number A38666, 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 Simin Siddiq, M.D. prescribe under Medicare Part D?

In 2024, Simin Siddiq, M.D. had 1,935 Medicare Part D claims for 167 beneficiaries; 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.