Quick answers
- Which hospitals does Karen Tinder work at?
- Medicare's official clinician data lists Karen Tinder at 4 hospitals: John Muir Medical Center - Concord Campus, John Muir Medical Center - Walnut Creek Campus, San Ramon Regional Medical Center and Stanford Health Care Tri-Valley. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Karen Tinder see patients?
- Medicare's clinician data lists 1 practice location in Lafayette, CA. Call before your visit to confirm the address.
- What is Karen Tinder's specialty?
- Medicare lists Nurse Practitioner as the primary specialty.
- Does Karen Tinder accept Medicare assignment?
- Yes. Medicare's clinician data says Karen Tinder accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does Karen Tinder offer telehealth?
- Medicare's clinician data says Karen Tinder offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Karen Tinder?
- (925) 296-7490, as listed in official Medicare / NPI Registry data.
- What is Karen Tinder's NPI number?
- 1225442080. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Karen Tinder works
Medicare's Facility Affiliation Data lists Karen Tinder at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- John Muir Medical Center - Concord CampusConcord, CA · Acute Care Hospital · CCN 050496
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA · Acute Care Hospital · CCN 050180
- San Ramon Regional Medical CenterSan Ramon, CA · Acute Care Hospital · CCN 050689
- Stanford Health Care Tri-ValleyPleasanton, CA · Acute Care Hospital · CCN 050283
Practice locations
Addresses where Karen Tinder is enrolled with Medicare (CMS data updated 2026-10-02).
- 3466 Mt Diablo Blvd, Suite C104Lafayette, CA 94549 (925) 296‑7490
Group practices
Medicare enrollment lists Karen Tinder as a member of this group (CMS data updated 2026-10-02).
- John Muir Physician Network494 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 1998 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1225442080 |
| 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 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- 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