Quick answers
- Does Michael S. Kobayashi accept Medicare assignment?
- Yes. Medicare's clinician data says Michael S. Kobayashi 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 S. Kobayashi see?
- In 2024, CMS data shows 608 Original Medicare patients and 3,833 services for Michael S. Kobayashi. This counts Original Medicare only and measures volume, not quality.
- What is Michael S. Kobayashi's NPI number?
- 1831317684. 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 S. Kobayashi, 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 | 608 |
|---|---|
| Services billed to Medicare | 3,833 |
| Different services or procedures | 90 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
Most frequent services
- Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml (Q9967)1,375 services
- Mri scan of leg joint without contrast (73721)85 services
- Mri scan of arm joint without contrast (73221)74 services
- Mri scan of lower spinal canal without contrast (72148)71 services
- X-ray of foot, minimum of 3 views (73630)70 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%
- Arthritis57%
- Diabetes43%
- Chronic kidney disease27%
- Ischemic heart disease24%
Practice locations
Addresses where Michael S. Kobayashi is enrolled with Medicare (CMS data updated October 2, 2026).
- 157 E Coolidge AveModesto, CA 95350 (209) 524‑6800
- 1801 E March Ln, Suite A130Stockton, CA 95210
- 2300 Clayton Rd, Suite 160Concord, CA 94520 (925) 825‑7777
- 2320 N California StStockton, CA 95204 (209) 466‑2000
Group practices
Medicare enrollment lists Michael S. Kobayashi as a member of these groups (CMS data updated October 2, 2026).
- Norcal Imaging82 clinicians in the group
- Modesto Advanced Diagnostic Imaging Medical Center65 clinicians in the group
- Stockton Diagnostic Imaging61 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Modesto
Clinicians with the same Medicare primary specialty in Modesto, CA — not a recommendation.
Other clinicians in Norcal Imaging
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Un Of California, Irvine, College Of Medicine |
| Graduation year | 2005 (21 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1831317684 |
| 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