Katherine Rebecca Exten, M.D.
Hematology & Oncology Physician · Mansfield, OH
Katherine Rebecca Exten, M.D. is a hematology & oncology physician with a practice address in Mansfield, Ohio, and NPI 1982996237, issued on May 4, 2011. Check the license (Ohio 35131800, as entered in NPPES) on the State Medical Board of Ohio; the Medicare figures below come from public CMS files.
- Name
- Katherine Rebecca Exten
- Credential
- M.D.
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License numbers
- 35131800 OH
036.134806 IL
Self-reported in NPPES; status is on the state search - Practice location
- 335 Glessner Ave, Mansfield, OH 44903
- Phone
- (419) 756-2003
- Enumerated
- May 4, 2011
- Record last updated
- Jan 25, 2022
- Medicaid ID
- 0233087 OH
- Medicare enrollment
- Enrolled (PECOS I20170731003033); accepts Medicare assignment
- Medical or professional school
- Ohio State University College Of Medicine, 2011
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 513 in Ohio → Look up another NPI →
Also registered at 335 Glessner Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Hamzah Abu-Sbeih, MDInternal Medicine Physician1881155687
- Arun Acharekar, MDEmergency Medicine Physician1659411544
- Kathleen Adams, MDHospitalist Physician1659932598
- Faisal Adhami, M.D., PH.D.Hematology & Oncology Physician1649405549
- Hussein Adly, M.D.Endocrinology, Diabetes & Metabolism Physician1013460575
- Maryam Ahmed, MDPulmonary Disease Physician1386297265
Verify Katherine Rebecca Exten in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersState Medical Board of Ohio
Search for license 35131800Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.7 times the Medicare Part D claims of the average hematology & oncology physician in 2024
2,333 Medicare Part D claims for 363 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 102 claims were for opioids.
Most prescribed
- Anastrozole292 claims
- Tamoxifen Citrate161 claims
- Prochlorperazine Maleate115 claims
- Eliquis108 claims
- Gabapentin107 claims
- Dexamethasone99 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 practice group's MIPS final score for 2023 (Medicare payment program): 81.3 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $72.42
4 payments; by number, the most common kind was education; the largest payer was Eisai Inc. The 8,560 providers of this specialty with any payment received $7,481.41 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
- American Oncology Partners PAColumbus, OH
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katherine Rebecca Exten among 513 hematology & oncology physician records in Ohio
Katherine Rebecca Exten, M.D. is one of 513 hematology & oncology physician records with a practice address in Ohio. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 72% of them.
- NPI issued2011 · 72% of these records are older, 25% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2011 · median 2001 among the 369 with a school on file
- Record last updated2022 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a Ohio practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in Ohio
There are 513 hematology & oncology physician records in Ohio.
All 513 in Ohio → Every provider in Mansfield → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Faisal Adhami, M.D., PH.D.Mansfield, OH 449031649405549
- Mark Browning, MDMansfield, OH 449031629041199
- Laura Weakland, MDMansfield, OH 449031073591525
- Mhd Al-Marrawi, MDMansfield, OH 449061588602627
- Donald Dewald, M.D.Mansfield, OH 449061538147525
- Shahzad Khan, M.D.Mansfield, OH 449061689644114
- James Fanning, M.D.Sandusky, OH 448701861443897
- Brian Murphy, M.D.Sandusky, OH 448701104877125
Common questions
What is Katherine Rebecca Exten, M.D.'s NPI number?
Katherine Rebecca Exten, M.D.'s National Provider Identifier (NPI) is 1982996237, issued on May 4, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Katherine Rebecca Exten, M.D. located?
The NPPES record lists a practice address at 335 Glessner Ave, Mansfield, OH, 44903. Phone: (419) 756-2003. Providers update this record themselves, so call before visiting.
How can I verify Katherine Rebecca Exten, M.D.'s license?
NPPES lists Ohio license number 35131800, as entered by the provider. Search the State Medical Board of Ohio at https://elicense.ohio.gov/oh_verifylicense. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Katherine Rebecca Exten, M.D. prescribe under Medicare Part D?
In 2024, Katherine Rebecca Exten, M.D. had 2,333 Medicare Part D claims for 363 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is Katherine Rebecca Exten, M.D.'s MIPS final score?
The 2023 MIPS final score is 81.3 of 100, reported for the practice group. 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.