Quick answers
- Does Garrett L. Walworth accept Medicare assignment?
- Yes. Medicare's clinician data says Garrett L. Walworth 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 Garrett L. Walworth see?
- In 2024, CMS data shows 237 Original Medicare patients and 309 services for Garrett L. Walworth. This counts Original Medicare only and measures volume, not quality.
- What is Garrett L. Walworth's NPI number?
- 1598794927. 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 Garrett L. Walworth, 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 | 237 |
|---|---|
| Services billed to Medicare | 309 |
| Different services or procedures | 23 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
Most frequent services
- Ct scan of chest with contrast (71260)73 services
- Nuclear medicine study from skull base to mid-thigh with ct scan (78815)58 services
- Ct scan of abdomen and pelvis with contrast (74177)49 services
- Low dose ct scan of chest for lung cancer screening (71271)30 services
- Ct scan of chest without contrast (71250)20 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 cholesterol68%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)57%
- Arthritis47%
- Diabetes39%
- COPD38%
Hospitals where Garrett L. Walworth works
Medicare's Facility Affiliation Data lists Garrett L. Walworth 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.
- Karmanos Cancer CenterDetroit, MI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: not listed by Medicare · CCN 230297
- McLaren Bay RegionBay City, MI · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 230041
- McLaren Central MichiganMount Pleasant, MI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 230080
- McLaren Northern MichiganPetoskey, MI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 230105
Practice locations
Addresses where Garrett L. Walworth is enrolled with Medicare (CMS data updated October 2, 2026).
- 32901 23 Mile Rd, Suite 120Chesterfield, MI 48047 (586) 725‑4604
- 4100 John R StDetroit, MI 48201 (800) 527‑6266
- 416 Connable AvePetoskey, MI 49770 (517) 975‑6475
Group practices
Medicare enrollment lists Garrett L. Walworth as a member of these groups (CMS data updated October 2, 2026).
- McLaren Medical Group213 clinicians in the group
- Barbara Ann Karmanos Cancer Institute57 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Chesterfield
Clinicians with the same Medicare primary specialty in Chesterfield, MI — not a recommendation.
Other clinicians in McLaren Medical Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Wayne State University School Of Medicine |
| Graduation year | 2000 (26 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1598794927 |
| 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