Quick answers
- Does Michael R. Siedow accept Medicare assignment?
- Yes. Medicare's clinician data says Michael R. Siedow 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 Michael R. Siedow see?
- In 2024, CMS data shows 184 Original Medicare patients and 1,747 services for Michael R. Siedow. This counts Original Medicare only and measures volume, not quality.
- What is Michael R. Siedow's NPI number?
- 1891227567. 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 Michael R. Siedow, 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 | 184 |
|---|---|
| Services billed to Medicare | 1,747 |
| Different services or procedures | 31 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Ct guidance for insertion of radiation therapy fields (77014)557 services
- Calculation of radiation therapy dose (77300)276 services
- Design and construction of complex radiation treatment device (77334)191 services
- Radiation treatment management, 5 treatment sessions (77427)174 services
- Complex radiation therapy planning (77263)72 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 blood pressure75%
- High cholesterol75%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)75%
- Arthritis46%
- Ischemic heart disease34%
- COPD33%
Hospitals where Michael R. Siedow works
Medicare's Facility Affiliation Data lists Michael R. Siedow at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Bucyrus Community HospitalBucyrus, OH · Critical Access Hospital · Emergency services: listed by Medicare · CCN 361316
- Grant Medical CenterColumbus, OH · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 360017
- OhioHealth Mansfield HospitalMansfield, OH · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 360118
- OhioHealth Shelby HospitalShelby, OH · Critical Access Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 361324
- Riverside Methodist HospitalColumbus, OH · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 360006
Practice locations
Addresses where Michael R. Siedow is enrolled with Medicare (CMS data updated October 2, 2026).
- 111 S Grant AveColumbus, OH 43215 (614) 566‑9489
- 801 Ohio Health Blvd, Suite 180Delaware, OH 43015 (740) 615‑0232
Group practices
Medicare enrollment lists Michael R. Siedow as a member of this group (CMS data updated October 2, 2026).
- OhioHealth Corporation2,314 clinicians in the group
Specialties
- Radiation Oncologyprimary
Other radiation oncologists in Columbus
Clinicians with the same Medicare primary specialty in Columbus, OH — not a recommendation.
Other clinicians in OhioHealth Corporation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Toledo Medical College |
| Graduation year | 2017 (9 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1891227567 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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