Ronald Grewenow, MD
NPI 1518053388 · Internal Medicine Physician · Portland, OR
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ronald Grewenow, MD is a Internal Medicine Physician provider in Portland, OR (NPI 1518053388).
Provider details
- NPI number
- 1518053388
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G27834 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-05
- Last updated
- 2007-07-08
Frequently asked questions
- What is Ronald Grewenow's NPI number?
- Ronald Grewenow's National Provider Identifier (NPI) is 1518053388, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ronald Grewenow's specialty?
- Ronald Grewenow is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Ronald Grewenow located?
- Ronald Grewenow's practice location on file with NPPES is 3710 Sw US Veterans Hospital Rd, Portland, OR 97239-2964.
- What is Ronald Grewenow's phone number?
- The practice phone number listed in the NPPES registry for Ronald Grewenow is (503) 721-7897.
- Does Ronald Grewenow accept Medicare?
- Ronald Grewenow is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ronald Grewenow's NPI active?
- Yes — Ronald Grewenow's NPI (1518053388) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.