Katherine A. Markelz, DO
Internal Medicine Physician · Florence, MA
Katherine A. Markelz, DO is an internal medicine physician with a practice address in Florence, Massachusetts, and NPI 1013370279, issued on Apr 4, 2016. Check the license (Massachusetts 281432, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Katherine A. Markelz
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 281432 MA
Self-reported in NPPES; status is on the state search - Practice location
- 70 Main St, Florence, MA 01062
- Phone
- (413) 586-8400
- Enumerated
- Apr 4, 2016
- Record last updated
- Mar 2, 2024
- Medicare enrollment
- Enrolled (PECOS I20200212000940); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 70 Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Karen Beyel, RPHPharmacist1518249523
- Gail Blanchard, NPFamily Nurse Practitioner1841384666
- Yotam Block, PA-CPhysician Assistant1861145930
- Brendan Boucher, DPT, PT, CSCSPhysical Therapist1871936211
Verify Katherine A. Markelz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 281432Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average internal medicine physician in 2024
219 Medicare Part D claims for 59 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Metformin Hcl18 claims
- Atorvastatin Calcium17 claims
- Hydrochlorothiazide16 claims
- Eliquis15 claims
- Lisinopril15 claims
- Levothyroxine Sodium14 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.
Katherine A. Markelz among 6,825 internal medicine physician records in Massachusetts
Katherine A. Markelz, DO is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 77% of them.
- NPI issued2016 · 77% of these records are older, 21% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2016 · median 2004 among the 4,103 with a school on file
- Record last updated2024 · 64% 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 Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
4 internal medicine physician records list a practice address in Florence
They are 4 of the 313 NPPES records with a practice address in Florence, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Florence → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Christine Baker, MDNorthampton, MA 010621518946359
- Carolyn Kendall, DOFlorence, MA 010621225097629
- Susan Mosler, MDFlorence, MA 010621245213735
- Robert Trump, M.D,Florence, MA 010621174711865
- Mark Novotny, MDNorthampton, MA 010611427072479
- David Alpern, MDNorthampton, MA 010601568422608
- Elizabeth Armstrong, M.D.Northampton, MA 010601881626786
- Paul Cheriyan, M.D.Northampton, MA 010601568720357
Common questions
What is Katherine A. Markelz, DO's NPI number?
Katherine A. Markelz, DO's National Provider Identifier (NPI) is 1013370279, issued on Apr 4, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Katherine A. Markelz, DO located?
The NPPES record lists a practice address at 70 Main St, Florence, MA, 01062. Phone: (413) 586-8400. Providers update this record themselves, so call before visiting.
How can I verify Katherine A. Markelz, DO's license?
NPPES lists Massachusetts license number 281432, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Katherine A. Markelz, DO prescribe under Medicare Part D?
In 2024, Katherine A. Markelz, DO had 219 Medicare Part D claims for 59 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.