Quick answers
- Which hospitals does John D. Oholleran work at?
- Medicare's official clinician data lists John D. Oholleran at 2 hospitals: Providence Milwaukie Hospital and Providence Willamette Falls Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John D. Oholleran see patients?
- Medicare's clinician data lists 1 practice location in Oregon City, OR. Call before your visit to confirm the address.
- What is John D. Oholleran's specialty?
- Medicare lists General Surgery as the primary specialty.
- Does John D. Oholleran accept Medicare assignment?
- Yes. Medicare's clinician data says John D. Oholleran 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 John D. Oholleran?
- (503) 723-6525, as listed in official Medicare / NPI Registry data.
- What is John D. Oholleran's NPI number?
- 1912007220. 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 D. Oholleran works
Medicare's Facility Affiliation Data lists John D. Oholleran at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Providence Milwaukie HospitalMilwaukie, OR · Acute Care Hospital · CCN 380082
- Providence Willamette Falls Medical CenterOregon City, OR · Acute Care Hospital · CCN 380038
Practice locations
Addresses where John D. Oholleran is enrolled with Medicare (CMS data updated 2026-10-02).
- 1510 Division St, Suite 210Oregon City, OR 97045 (503) 723‑6525
Group practices
Medicare enrollment lists John D. Oholleran as a member of this group (CMS data updated 2026-10-02).
- Providence Health and Services Oregon1,433 clinicians in the group
Specialties
- General Surgeryprimary
Other general surgeons in Oregon City
Clinicians with the same Medicare primary specialty in Oregon City, OR — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Nebraska College Of Medicine |
| Graduation year | 1987 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1912007220 |
| 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