John Alferes, M.D.
NPI 1679680805 · Internal Medicine Physician · Portland, OR
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Alferes, M.D. is a Internal Medicine Physician provider in Portland, OR (NPI 1679680805).
Provider details
- NPI number
- 1679680805
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- OR MD13486 (OR)
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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 57 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 292 | 120 |
| Amlodipine Besylate | 142 | 67 |
| Lisinopril | 122 | 57 |
| Losartan Potassium | 114 | 59 |
| Simvastatin | 99 | 36 |
| Tamsulosin Hcl | 86 | 35 |
| Levothyroxine Sodium | 84 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-24
- Last updated
- 2022-02-04
Frequently asked questions
- What is John Alferes's NPI number?
- John Alferes's National Provider Identifier (NPI) is 1679680805, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Alferes's specialty?
- John Alferes is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Alferes located?
- John Alferes's practice location on file with NPPES is 3550 N Interstate Ave, Portland, OR 97227-1196.
- What is John Alferes's phone number?
- The practice phone number listed in the NPPES registry for John Alferes is (503) 285-9321.
- Does John Alferes accept Medicare?
- John Alferes is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Alferes's NPI active?
- Yes — John Alferes's NPI (1679680805) is active in the NPPES registry as of the last update on 2022-02-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.