Quick answers
- Does Marcus Juan L. Esteban accept Medicare assignment?
- Yes. Medicare's clinician data says Marcus Juan L. Esteban 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 Marcus Juan L. Esteban see?
- In 2024, CMS data shows 19 Original Medicare patients and 36 services for Marcus Juan L. Esteban. This counts Original Medicare only and measures volume, not quality.
- What is Marcus Juan L. Esteban's NPI number?
- 1922455864. 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 Marcus Juan L. Esteban, 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 | 19 |
|---|---|
| Services billed to Medicare | 36 |
| Different services or procedures | 15 |
| Participating Medicare provider | Yes |
| Average age of these patients | 67 |
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 pressure75%
Hospitals where Marcus Juan L. Esteban works
Medicare's Facility Affiliation Data lists Marcus Juan L. Esteban 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 and Rehab CenterVallejo, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: not listed by Medicare · CCN 050073
Practice locations
Addresses where Marcus Juan L. Esteban is enrolled with Medicare (CMS data updated October 2, 2026).
- 975 Sereno DrVallejo, CA 94589 (707) 651‑1000
Group practices
Medicare enrollment lists Marcus Juan L. Esteban as a member of this group (CMS data updated October 2, 2026).
- Permanente Medical Group Inc10,996 clinicians in the group
Specialties
- Internal Medicineprimary
- Gastroenterologyalso
Other internal medicine doctors in Vallejo
Clinicians with the same Medicare primary specialty in Vallejo, 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 |
|---|---|
| Graduation year | 2014 (12 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1922455864 |
| 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