Russell Greif, D.O.
NPI 1669519765 · Internal Medicine Physician · Lancaster, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Russell Greif, D.O. is a Internal Medicine Physician provider in Lancaster, CA (NPI 1669519765).
Provider details
- NPI number
- 1669519765
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 20A5410 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
2,558 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. 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 .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 899 | $138 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 444 | $81 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 286 | $98 |
| Annual Alcohol Misuse Screening, 5 to 15 MinutesG0442 | 167 | $21 |
| Annual Depression Screening, 5 to 15 MinutesG0444 | 161 | $21 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 160 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 66 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Rosuvastatin Calcium | 195 | 50 |
| Amlodipine Besylate | 175 | 47 |
| Atorvastatin Calcium | 131 | 31 |
| Lisinopril | 119 | 27 |
| Levothyroxine Sodiumbrand: Synthroid | 105 | 19 |
| Losartan Potassium | 96 | 30 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$634 across 11 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-01-30
- Last updated
- 2011-12-13
Frequently asked questions
- What is Russell Greif's NPI number?
- Russell Greif's National Provider Identifier (NPI) is 1669519765, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Russell Greif's specialty?
- Russell Greif is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Russell Greif located?
- Russell Greif's practice location on file with NPPES is 44241 15th St W, Lancaster, CA 93534-4037.
- What is Russell Greif's phone number?
- The practice phone number listed in the NPPES registry for Russell Greif is (661) 726-6490.
- Does Russell Greif accept Medicare?
- Russell Greif is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Russell Greif's NPI active?
- Yes — Russell Greif's NPI (1669519765) is active in the NPPES registry as of the last update on 2011-12-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.