Quick answers
- Does Joanna Diel-Martin accept Medicare assignment?
- Yes. Medicare's clinician data says Joanna Diel-Martin 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 Joanna Diel-Martin's NPI number?
- 1932759461. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Joanna Diel-Martin works
Medicare's Facility Affiliation Data lists Joanna Diel-Martin 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.
- Petaluma Valley HospitalPetaluma, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: not listed by Medicare · CCN 050136
- Providence Santa Rosa Memorial HospitalSanta Rosa, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050174
Practice locations
Addresses where Joanna Diel-Martin is enrolled with Medicare (CMS data updated October 2, 2026).
- 1179 N McDowell BlvdPetaluma, CA 94954 (707) 559‑7500
- PO Box, Suite 910Point Reyes Station, CA 94956
Group practices
Medicare enrollment lists Joanna Diel-Martin as a member of these groups (CMS data updated October 2, 2026).
- Petaluma Health Center Inc73 clinicians in the group
- Coastal Health Alliance37 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Petaluma
Clinicians with the same Medicare primary specialty in Petaluma, CA — not a recommendation.
Other clinicians in Petaluma Health Center Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2019 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1932759461 |
| 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