Quick answers
- Which hospitals does Ryan H. Joo work at?
- Medicare's official clinician data lists Ryan H. Joo at 2 hospitals: Huntington Hospital and USC Arcadia Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Ryan H. Joo see patients?
- Medicare's clinician data lists 1 practice location in Pasadena, CA. Call before your visit to confirm the address.
- What is Ryan H. Joo's specialty?
- Medicare lists Infectious Disease as the primary specialty, and also Internal Medicine.
- Does Ryan H. Joo accept Medicare assignment?
- Yes. Medicare's clinician data says Ryan H. Joo 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.
- What is the phone number for Ryan H. Joo?
- (626) 304-0782, as listed in official Medicare / NPI Registry data.
- What is Ryan H. Joo's NPI number?
- 1639301922. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Ryan H. Joo works
Medicare's Facility Affiliation Data lists Ryan H. Joo at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Huntington HospitalPasadena, CA · Acute Care Hospital · CCN 050438
- USC Arcadia HospitalArcadia, CA · Acute Care Hospital · CCN 050238
Practice locations
Addresses where Ryan H. Joo is enrolled with Medicare (CMS data updated 2026-10-02).
- 960 E Green St, Suite 105Pasadena, CA 91106 (626) 304‑0782
Specialties
- Infectious Diseaseprimary
- Internal Medicinealso
Other infectious disease doctors in Pasadena
Clinicians with the same Medicare primary specialty in Pasadena, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2009 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1639301922 |
| 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