Quick answers
- Does Annalissa D. Pena accept Medicare assignment?
- Yes. Medicare's clinician data says Annalissa D. Pena 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.
- What is Annalissa D. Pena's NPI number?
- 1518843978. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Annalissa D. Pena works
Medicare's Facility Affiliation Data lists Annalissa D. Pena 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.
- San Ramon Regional Medical CenterSan Ramon, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050689
- Stanford Health Care Tri-ValleyPleasanton, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050283
Practice locations
Addresses where Annalissa D. Pena is enrolled with Medicare (CMS data updated October 2, 2026).
- 2180 W Grant Line Rd, Suite 100Tracy, CA 95377 (925) 463‑0470
- 4626 Willow Rd, Suite 200Pleasanton, CA 94588 (925) 463‑0470
Group practices
Medicare enrollment lists Annalissa D. Pena as a member of this group (CMS data updated October 2, 2026).
- Bass Medical Group291 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Tracy
Clinicians with the same Medicare primary specialty in Tracy, CA — not a recommendation.
Other clinicians in Bass Medical Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2025 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1518843978 |
| 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
- 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