Quick answers
- Does Katherine A. Markelz accept Medicare assignment?
- Yes. Medicare's clinician data says Katherine A. Markelz accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Katherine A. Markelz see?
- In 2024, CMS data shows 22 Original Medicare patients and 144 services for Katherine A. Markelz. This counts Original Medicare only and measures volume, not quality.
- What is Katherine A. Markelz's NPI number?
- 1013370279. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Katherine A. Markelz, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 22 |
|---|---|
| Services billed to Medicare | 144 |
| Different services or procedures | 13 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)54 services
- Osteopathic manipulative treatment, 9-10 body regions (98929)46 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol50%
- Arthritis50%
Practice locations
Addresses where Katherine A. Markelz is enrolled with Medicare (CMS data updated October 2, 2026).
- 16 Ctr St, Suite 305Northampton, MA 01060 (413) 203‑9521
Specialties
Other internal medicine doctors in Northampton
Clinicians with the same Medicare primary specialty in Northampton, MA — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Graduation year | 2016 (10 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1013370279 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians