Katarzyna Tesmer, MD
Neonatal-Perinatal Medicine Physician · Orange, CA
Katarzyna Tesmer, MD is a neonatal-perinatal medicine physician with a practice address in Orange, California, and NPI 1679662753, issued on Oct 12, 2006. Check the license (California A53721, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Katarzyna Tesmer
- Credential
- MD
- Primary taxonomy
- Neonatal-Perinatal Medicine Physician 2080N0001X
- License number
- A53721 CA
Self-reported in NPPES; status is on the state search - Practice location
- 455 S Main St, Orange, CA 92868
- Phone
- (714) 532-8620
- Enumerated
- Oct 12, 2006
- Entity
- Type 1 · individual
Also registered at 455 S Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jose Abdenur, M.D.Clinical Biochemical Genetics Physician1154428027
- Eileen Abejar, PNPRegistered Nurse1083865042
- Felice Adler-Shohet, M.D.Pediatric Infectious Diseases Physician1962513051
- Irfan Ahmad, MDPediatrics Physician1699790139
- Sana Al-Jundi, M.D.Pediatric Critical Care Medicine Physician1912090465
- Ragnar Amlie, M.D.Neonatal-Perinatal Medicine Physician1972696433
Verify Katarzyna Tesmer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A53721Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
82% fewer Medicare Part D claims than the average neonatal-perinatal medicine physician in 2024
12 Medicare Part D claims, against an average of 68 among the 157 providers of this specialty who prescribed in Part D.
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: $218.75
12 payments, mostly food and beverage; the largest payer was Revance Therapeutics, Inc.. The 644 providers of this specialty with any payment received $760.10 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.
Neonatal-Perinatal Medicine Physician providers in California
There are 630 neonatal-perinatal medicine physician records in California.
Other neonatal-perinatal medicine physician records in California
- Afshan Abbasi, M.D.Los Angeles, CA1831214428
- Ahmad Aboaziza, M.D.Visalia, CA1932442944
- Maria Abrantes, MDAnaheim, CA1861438889
- Harry Ackley, M.D.Menlo Park, CA1588697478
- Marian Adams, MDSan Jose, CA1457452740
- Prashant Agarwal, M.D.Madera, CA1770714834
- Bimal Agrawal, M.D.Los Angeles, CA1932341096
- Vikash AgrawalLoma Linda, CA1619383163
- David Aguilar, MDFresno, CA1184723157
- Amardeep Ahluwalia, MDSacramento, CA1245328988
Common questions
What is Katarzyna Tesmer, MD's NPI number?
Katarzyna Tesmer, MD's National Provider Identifier (NPI) is 1679662753, issued on Oct 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Katarzyna Tesmer, MD located?
The NPPES record lists a practice address at 455 S Main St, Orange, CA, 92868. Phone: (714) 532-8620. Providers update this record themselves, so call before visiting.
How can I verify Katarzyna Tesmer, MD's license?
NPPES lists California license number A53721, 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 Katarzyna Tesmer, MD prescribe under Medicare Part D?
In 2024, Katarzyna Tesmer, MD had 12 Medicare Part D claims; the average among neonatal-perinatal medicine physician prescribers was 68. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.