Quick answers
- Which hospitals does John R. Hallsten work at?
- Medicare's official clinician data lists John R. Hallsten at 1 hospital: Grossmont Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John R. Hallsten see patients?
- Medicare's clinician data lists 2 practice locations, including Solana Beach, CA and La Mesa, CA. Call before your visit to confirm the address.
- What is John R. Hallsten's specialty?
- Medicare lists Vascular Surgery as the primary specialty.
- Does John R. Hallsten accept Medicare assignment?
- Medicare's clinician data says John R. Hallsten may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is John R. Hallsten's NPI number?
- 1821679077. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John R. Hallsten works
Medicare's Facility Affiliation Data lists John R. Hallsten at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Grossmont HospitalLa Mesa, CA · Acute Care Hospital · CCN 050026
Practice locations
Addresses where John R. Hallsten is enrolled with Medicare (CMS data updated 2026-10-02).
- 440 Stevens Ave, Suite 370Solana Beach, CA 92075
- 8860 Ctr Dr, Suite 450La Mesa, CA 91942
Specialties
- Vascular Surgeryprimary
Other vascular surgeons in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Loyola University Of Chicago, Stritch School Of Medicine |
| Graduation year | 2021 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1821679077 |
| 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