Quick answers
- Where does Ronald U. Vallejo see patients?
- Medicare's clinician data lists 2 practice locations, including Portland, OR and Tigard, OR. Call before your visit to confirm the address.
- What is Ronald U. Vallejo's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Ronald U. Vallejo accept Medicare assignment?
- Yes. Medicare's clinician data says Ronald U. Vallejo 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 Ronald U. Vallejo?
- (503) 293-0161, as listed in official Medicare / NPI Registry data.
- What is Ronald U. Vallejo's NPI number?
- 1255381422. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Ronald U. Vallejo is enrolled with Medicare (CMS data updated 2026-10-02).
- 800 SW 13th AvePortland, OR 97205
- 9250 SW Hall BlvdTigard, OR 97223 (503) 293‑0161
Group practices
Medicare enrollment lists Ronald U. Vallejo as a member of this group (CMS data updated 2026-10-02).
- Portland Clinic94 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Portland
Clinicians with the same Medicare primary specialty in Portland, OR — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1988 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1255381422 |
| 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
- 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