Izabela Witczak, M.D
Internal Medicine Physician · San Marcos, CA
Izabela Witczak, M.D is an internal medicine physician with a practice address in San Marcos, California, and NPI 1184735201, issued on Aug 31, 2006. Check the license (California A71311, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Izabela Witczak
- Credential
- M.D
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A71311 CA
Self-reported in NPPES; status is on the state search - Practice location
- 150 Valpreda RD, San Marcos, CA 92069
- Phone
- (760) 736-6700
- Enumerated
- Aug 31, 2006
- Record last updated
- Nov 4, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (760) 736-8740
- Medicare enrollment
- Enrolled (PECOS I20041129000602); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 150 Valpreda RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Leon Altamirano, PSY.D.Psychologist1619271517
- Blanca Arias, LCSWClinical Social Worker1033223649
- Lynda Ariella, PHDClinical Psychologist1073518965
- Maria BanuelosCase Manager/Care Coordinator1720280589
Verify Izabela Witczak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A71311Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
38% more Medicare Part D claims than the average internal medicine physician in 2024
4,393 Medicare Part D claims for 282 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 82 claims were for opioids.
Most prescribed
- Atorvastatin Calcium340 claims
- Amlodipine Besylate230 claims
- Metformin Hcl219 claims
- Levothyroxine Sodium185 claims
- Losartan Potassium168 claims
- Lisinopril153 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: $97.38
5 payments; by number, the most common kind was food and beverage; the largest payer was Scilex Pharmaceuticals Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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 one group practice
- North County Health Project, Inc.San Marcos, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Izabela Witczak among 17,696 internal medicine physician records in California
Izabela Witczak, M.D is one of 17,696 internal medicine physician records with a practice address in California. 79% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1987 · median 2004 among the 11,065 with a school on file
- Record last updated2011 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Internal Medicine Physician providers in California
There are 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Marcos → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Shreya Chandra, MDSan Marcos, CA 920691972519825
- Lauren Jefferis, MDSan Marcos, CA 920691346354776
- Samuel Poniachik, M.DSan Marcos, CA 920691467485078
- Marie Russell, MD.San Marcos, CA 920691609947449
- Arturo Tolentino, M.D.San Marcos, CA 920691609066018
- Abbas Ali, M.DSantee, CA 920711104200112
- Azzah Arikat, MDSantee, CA 920711184971640
- David Corbin, MDSantee, CA 920711275627200
Common questions
What is Izabela Witczak, M.D's NPI number?
Izabela Witczak, M.D's National Provider Identifier (NPI) is 1184735201, issued on Aug 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Izabela Witczak, M.D located?
The NPPES record lists a practice address at 150 Valpreda RD, San Marcos, CA, 92069. Phone: (760) 736-6700. Providers update this record themselves, so call before visiting.
How can I verify Izabela Witczak, M.D's license?
NPPES lists California license number A71311, 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 Izabela Witczak, M.D prescribe under Medicare Part D?
In 2024, Izabela Witczak, M.D had 4,393 Medicare Part D claims for 282 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.