Michael Stein, M.D.
NPI 1639157274 · Internal Medicine Physician · Campbell, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Stein, M.D. is a Internal Medicine Physician provider in Campbell, CA (NPI 1639157274).
Provider details
- NPI number
- 1639157274
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 9884 (NV)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 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 · 83 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 547 | 187 |
| Amlodipine Besylate | 300 | 97 |
| Lisinopril | 219 | 75 |
| Losartan Potassium | 211 | 69 |
| Levothyroxine Sodium | 175 | 58 |
| Atenolol | 122 | 44 |
| Simvastatin | 120 | 38 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-01-04
- Last updated
- 2023-03-07
Frequently asked questions
- What is Michael Stein's NPI number?
- Michael Stein's National Provider Identifier (NPI) is 1639157274, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Stein's specialty?
- Michael Stein is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Stein located?
- Michael Stein's practice location on file with NPPES is 220 E Hacienda Ave, Campbell, CA 95008-6617.
- What is Michael Stein's phone number?
- The practice phone number listed in the NPPES registry for Michael Stein is (408) 871-9440.
- Does Michael Stein accept Medicare?
- Michael Stein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Stein's NPI active?
- Yes — Michael Stein's NPI (1639157274) is active in the NPPES registry as of the last update on 2023-03-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.