Lukasz Iwanczyk, M.D.
Geriatric Medicine (Internal Medicine) Physician · Ventura, CA
Lukasz Iwanczyk, M.D. is a geriatric medicine (internal medicine) physician with a practice address in Ventura, California, and NPI 1114953262, issued on Jun 23, 2006. Check the license (California A79334, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Lukasz Iwanczyk
- Credential
- M.D.
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- A79334 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5855 Olivas Park Dr, Ventura, CA 93003
- Phone
- (805) 667-2801
- Enumerated
- Jun 23, 2006
- Record last updated
- May 8, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (805) 667-2865
- Medicare enrollment
- Enrolled (PECOS I20050325000178); accepts Medicare assignment
- Medical or professional school
- New York Medical College, 2000
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 532 in California → Look up another NPI →
Also registered at 5855 Olivas Park Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Arielle Clute, MDFamily Medicine Physician1629530217
- Gosta Iwasiuk, M.D.Surgery Physician1114023249
- Alexander Jehlar, M.D.Hospitalist Physician1033185244
- Roland Ouellette, NPNurse Practitioner1902116239
Verify Lukasz Iwanczyk in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A79334Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
233 Medicare Part D claims for 67 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 13 claims were for opioids.
Most prescribed
- Diclofenac Sodium25 claims
- Gabapentin17 claims
- Duloxetine Hcl15 claims
- Sertraline Hcl14 claims
- Carbidopa-Levodopa11 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.
Bills Medicare through one group practice
- Pacific Inpatient PhysiciansVentura, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Lukasz Iwanczyk among 532 geriatric medicine (internal medicine) physician records in California
Lukasz Iwanczyk, M.D. is one of 532 geriatric medicine (internal medicine) physician records with a practice address in California. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 46% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 51% of these records are
- Graduated2000 · median 1999 among the 271 with a school on file
- Record last updated2015 · 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 207RG0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in California
There are 532 geriatric medicine (internal medicine) physician records in California.
All 532 in California → Every provider in Ventura → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Lanyard Dial, M.D.Ventura, CA 930031629131545
- Andrea Parmelee, M.D.Ventura, CA 930031790796217
- Daryush Parsa, M.D.Ventura, CA 930011417011594
- Edgardo Falcon, M.D.Camarillo, CA 930101417992561
- Raymond Sims, M.D.Ojai, CA 930231598853434
- Vinod Valiveti, M.D.Oxnard, CA 930301598714107
- Lucia Dattoma, MDSimi Valley, CA 930651164628384
- Camille Olsen, M.D.Santa Barbara, CA 931031609228600
Common questions
What is Lukasz Iwanczyk, M.D.'s NPI number?
Lukasz Iwanczyk, M.D.'s National Provider Identifier (NPI) is 1114953262, issued on Jun 23, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Lukasz Iwanczyk, M.D. located?
The NPPES record lists a practice address at 5855 Olivas Park Dr, Ventura, CA, 93003. Phone: (805) 667-2801. Providers update this record themselves, so call before visiting.
How can I verify Lukasz Iwanczyk, M.D.'s license?
NPPES lists California license number A79334, 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 Lukasz Iwanczyk, M.D. prescribe under Medicare Part D?
In 2024, Lukasz Iwanczyk, M.D. had 233 Medicare Part D claims for 67 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.