Katherine Hanna Tkaczuk, M.D.
Medical Oncology Physician · Baltimore, MD
Katherine Hanna Tkaczuk, M.D. is a medical oncology physician with a practice address in Baltimore, Maryland, and NPI 1225079601, issued on Jun 9, 2006. Check the license (Maryland D36146, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Katherine Hanna Tkaczuk
- Credential
- M.D.
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- D36146 MD
Self-reported in NPPES; status is on the state search - Practice location
- 22 S Greene St, Baltimore, MD 21201
- Phone
- (410) 328-2567
- Enumerated
- Jun 9, 2006
- Record last updated
- Mar 8, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (410) 328-6896
- Medicaid ID
- 182931900 MD
- Medicare enrollment
- Enrolled (PECOS I20101110000291); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 224 in Maryland → Look up another NPI →
Also registered at 22 S Greene St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Bizhan Aarabi, MDNeurological Surgery Physician1174578876
- Elsadig Abdalla, MDStudent in an Organized Health Care Education/Training Program1073364477
- Ehssan AbdolalizadehStudent in an Organized Health Care Education/Training Program1093653271
- Mohammad Abdulelah, MDStudent in an Organized Health Care Education/Training Program1114650108
- Leenah AbdulgaderStudent in an Organized Health Care Education/Training Program1386323301
- Ifedayo Abiola-Matthew, CRNPAcute Care Nurse Practitioner1033781117
Verify Katherine Hanna Tkaczuk in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D36146Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
32% fewer Medicare Part D claims than the average medical oncology physician in 2024
476 Medicare Part D claims for 100 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 20% of claims. 32 claims were for opioids.
Most prescribed
- Letrozole174 claims
- Anastrozole36 claims
- Verzenio31 claims
- Orserdu23 claims
- Oxycodone Hcl22 claims
- Exemestane16 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: $505.58
21 payments; by number, the most common kind was food and beverage; the largest payer was Novartis Pharmaceuticals Corporation. The 3,343 providers of this specialty with any payment received $11,773.47 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
- University OF Maryland Oncology Associates PABaltimore, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katherine Hanna Tkaczuk among 224 medical oncology physician records in Maryland
Katherine Hanna Tkaczuk, M.D. is one of 224 medical oncology physician records with a practice address in Maryland. 67% 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 4% of them.
- NPI issued2006 · 4% of these records are older, 53% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 57% of these records are
- Graduated1984 · median 2000 among the 128 with a school on file
- Record last updated2011 · 69% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Oncology Physician providers in Maryland
There are 224 medical oncology physician records in Maryland.
All 224 in Maryland → Every provider in Baltimore → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Kevin Cullen, M.D.Baltimore, MD 212011225071236
- Laurence Doyle, M.D.Baltimore, MD 212011306889399
- Ronald Gartenhaus, M.D.Baltimore, MD 212011376583864
- Nancy Hardy, MDBaltimore, MD 212011437487717
- Petr Hausner, MDBaltimore, MD 212011376534222
- Arif Hussain, M.D.Baltimore, MD 212011770546830
- Madelyn Klugman, MD, MSCBaltimore, MD 212011750918777
- Candace Mainor, M.D.Baltimore, MD 212011568738334
Common questions
What is Katherine Hanna Tkaczuk, M.D.'s NPI number?
Katherine Hanna Tkaczuk, M.D.'s National Provider Identifier (NPI) is 1225079601, issued on Jun 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Katherine Hanna Tkaczuk, M.D. located?
The NPPES record lists a practice address at 22 S Greene St, Baltimore, MD, 21201. Phone: (410) 328-2567. Providers update this record themselves, so call before visiting.
How can I verify Katherine Hanna Tkaczuk, M.D.'s license?
NPPES lists Maryland license number D36146, as entered by the provider. Search the Maryland Board of Physicians at https://www.mbp.state.md.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Katherine Hanna Tkaczuk, M.D. prescribe under Medicare Part D?
In 2024, Katherine Hanna Tkaczuk, M.D. had 476 Medicare Part D claims for 100 beneficiaries; the average among medical oncology physician prescribers was 703. 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.