Quick answers
- Does Marcos H. Siqueiros accept Medicare assignment?
- Yes. Medicare's clinician data says Marcos H. Siqueiros accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Marcos H. Siqueiros see?
- In 2024, CMS data shows 28 Original Medicare patients and 54 services for Marcos H. Siqueiros. This counts Original Medicare only and measures volume, not quality.
- What is Marcos H. Siqueiros's NPI number?
- 1790862647. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Marcos H. Siqueiros, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 28 |
|---|---|
| Services billed to Medicare | 54 |
| Different services or procedures | 14 |
| Participating Medicare provider | Yes |
| Average age of these patients | 68 |
Most frequent services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)16 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure71%
- High cholesterol71%
- Ischemic heart disease43%
Hospitals where Marcos H. Siqueiros works
Medicare's Facility Affiliation Data lists Marcos H. Siqueiros at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Kaiser Foundation Hospital-Santa ClaraSanta Clara, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050071
Practice locations
Addresses where Marcos H. Siqueiros is enrolled with Medicare (CMS data updated October 2, 2026).
- 700 Lawrence ExpySanta Clara, CA 95051 (408) 851‑1000
- 710 Lawrence Express WaySanta Clara, CA 95051 (408) 851‑1000
Group practices
Medicare enrollment lists Marcos H. Siqueiros as a member of this group (CMS data updated October 2, 2026).
- Permanente Medical Group Inc10,996 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Santa Clara
Clinicians with the same Medicare primary specialty in Santa Clara, CA — not a recommendation.
Other clinicians in Permanente Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, San Francisco School Of Medicine |
| Graduation year | 1995 (31 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1790862647 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians