Katarzyna Twardowska, MD
Internal Medicine Physician · Anaheim, CA
Katarzyna Twardowska, MD is an internal medicine physician with a practice address in Anaheim, California, and NPI 1790881795, issued on Sep 16, 2006. Check the license (California A69481, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Katarzyna Twardowska
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A69481 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1801 W Romneya Dr, Anaheim, CA 92801
- Phone
- (714) 780-5695
- Enumerated
- Sep 16, 2006
- Record last updated
- Jul 9, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (714) 780-5694
- Medicare enrollment
- Enrolled (PECOS I20100826000947); 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 1801 W Romneya Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Katarzyna Twardowska in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A69481Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
43% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,810 Medicare Part D claims for 253 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 68 claims were for opioids.
Most prescribed
- Amlodipine Besylate85 claims
- Pantoprazole Sodium82 claims
- Atorvastatin Calcium76 claims
- Levothyroxine Sodium65 claims
- Potassium Chloride56 claims
- Levetiracetam55 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.
The MIPS final score for 2023 (Medicare payment program): 52.3 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Southern California Hospitalist Network Medical Group IncOrange, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katarzyna Twardowska among 17,696 internal medicine physician records in California
Katarzyna Twardowska, MD 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
- Graduated1989 · median 2004 among the 11,065 with a school on file
- Record last updated2007 · 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).
189 internal medicine physician records list a practice address in Anaheim
They are 189 of the 9,018 NPPES records with a practice address in Anaheim, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Anaheim → Internal Medicine Physician nationwide →
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Common questions
What is Katarzyna Twardowska, MD's NPI number?
Katarzyna Twardowska, MD's National Provider Identifier (NPI) is 1790881795, issued on Sep 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Katarzyna Twardowska, MD located?
The NPPES record lists a practice address at 1801 W Romneya Dr, Anaheim, CA, 92801. Phone: (714) 780-5695. Providers update this record themselves, so call before visiting.
How can I verify Katarzyna Twardowska, MD's license?
NPPES lists California license number A69481, 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 Twardowska, MD prescribe under Medicare Part D?
In 2024, Katarzyna Twardowska, MD had 1,810 Medicare Part D claims for 253 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Katarzyna Twardowska, MD's MIPS final score?
The 2023 MIPS final score is 52.3 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.