Gregory Krastein, MD
Nephrology Physician · Oxnard, CA
Gregory Krastein, MD is a nephrology physician with a practice address in Oxnard, California, and NPI 1942358759, issued on Jan 8, 2007. Check the license (California G70211, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gregory Krastein
- Credential
- MD
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- G70211 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2103 E Gonzales RD, Oxnard, CA 93036
- Phone
- (805) 822-4595
- Enumerated
- Jan 8, 2007
- Record last updated
- Feb 21, 2023
- Medicare enrollment
- Enrolled (PECOS I20041112001209); accepts Medicare assignment
- Medical or professional school
- George Washington University School Of Medicine, 1990
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 1,468 in California → Look up another NPI →
Also registered at 2103 E Gonzales RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Amelia Dahlgren, OTR/LOccupational Therapist1578040218
- Bettye Torres-Saleh, PTPhysical Therapist1417171802
Verify Gregory Krastein in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G70211Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
18% fewer Medicare Part D claims than the average nephrology physician in 2024
1,205 Medicare Part D claims for 287 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D.
Most prescribed
- Calcitriol130 claims
- Lisinopril117 claims
- Amlodipine Besylate103 claims
- Metformin Hcl Er98 claims
- Losartan Potassium80 claims
- Jardiance79 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $185.53
4 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Pharmaceuticals, Inc. The 8,230 providers of this specialty with any payment received $3,091.37 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Hawaii Permanente Medical Group IncHonolulu, HI
- Southern California Permanente Medical GroupOxnard, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory Krastein among 1,468 nephrology physician records in California
Gregory Krastein, MD is one of 1,468 nephrology physician records with a practice address in California. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 52% of them.
- NPI issued2007 · 52% of these records are older, 35% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated1990 · median 2001 among the 1,128 with a school on file
- Record last updated2023 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in California
There are 1,468 nephrology physician records in California.
All 1,468 in California → Every provider in Oxnard → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Nicholas Bednarski, M.D.Oxnard, CA 930361457425860
- Frank Chieu, M.D.Oxnard, CA 930361235203647
- Ali Dana, M.D.Oxnard, CA 930361669561536
- Steven Ledesma, M.D.Oxnard, CA 930361386718799
- Tane Liu, M.D.Oxnard, CA 930361588738991
- Hashim Mapara, MDOxnard, CA 930361306074927
- Koosha Mortazavi, M.D.Oxnard, CA 930361215966999
- Rajendra Niraula, MDOxnard, CA 930361922201003
Common questions
What is Gregory Krastein, MD's NPI number?
Gregory Krastein, MD's National Provider Identifier (NPI) is 1942358759, issued on Jan 8, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Krastein, MD located?
The NPPES record lists a practice address at 2103 E Gonzales RD, Oxnard, CA, 93036. Phone: (805) 822-4595. Providers update this record themselves, so call before visiting.
How can I verify Gregory Krastein, MD's license?
NPPES lists California license number G70211, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gregory Krastein, MD prescribe under Medicare Part D?
In 2024, Gregory Krastein, MD had 1,205 Medicare Part D claims for 287 beneficiaries; the average among nephrology physician prescribers was 1,465. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.