Gregory Krastein, MD
NPI 1942358759 · Nephrology Physician · Oxnard, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Krastein, MD is a Nephrology Physician provider in Oxnard, CA (NPI 1942358759).
Provider details
- NPI number
- 1942358759
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G70211 (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
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
56 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 | 43 | $107 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 13 | $142 |
Typical Medicare-allowed amounts for these services range $107–$142 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 22 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Calcitriol | 130 | 52 |
| Lisinopril | 117 | 50 |
| Amlodipine Besylate | 103 | 39 |
| Metformin Hclbrand: Metformin Hcl Er | 98 | 32 |
| Losartan Potassium | 80 | 34 |
| Empagliflozinbrand: Jardiance | 79 | 22 |
| Sevelamer Carbonate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$186 across 4 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
Additional practice locations (1)
- 19836 Ventura Blvd Suite CWoodland Hills, CA 91364Phone: (805) 822-4595
Registry dates
- Enumerated
- 2007-01-08
- Last updated
- 2023-02-21
- Certified
- 2023-02-14
Frequently asked questions
- What is Gregory Krastein's NPI number?
- Gregory Krastein's National Provider Identifier (NPI) is 1942358759, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Krastein's specialty?
- Gregory Krastein is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Krastein located?
- Gregory Krastein's practice location on file with NPPES is 2103 E Gonzales Rd, Oxnard, CA 93036-3757.
- What is Gregory Krastein's phone number?
- The practice phone number listed in the NPPES registry for Gregory Krastein is (805) 822-4595.
- Does Gregory Krastein accept Medicare?
- Gregory Krastein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Krastein's NPI active?
- Yes — Gregory Krastein's NPI (1942358759) is active in the NPPES registry as of the last update on 2023-02-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.