Quick answers
- Does Shunji Nagai accept Medicare assignment?
- Yes. Medicare's clinician data says Shunji Nagai 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 Shunji Nagai see?
- In 2024, CMS data shows 39 Original Medicare patients and 90 services for Shunji Nagai. This counts Original Medicare only and measures volume, not quality.
- What is Shunji Nagai's NPI number?
- 1821433913. 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 Shunji Nagai, 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 | 39 |
|---|---|
| Services billed to Medicare | 90 |
| Different services or procedures | 24 |
| Participating Medicare provider | Yes |
| Average age of these patients | 66 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)28 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)19 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 cholesterol67%
- Diabetes59%
- Chronic kidney disease56%
- Depression46%
- Ischemic heart disease44%
Hospitals where Shunji Nagai works
Medicare's Facility Affiliation Data lists Shunji Nagai 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.
- Henry Ford Health HospitalDetroit, MI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 230053
Practice locations
Addresses where Shunji Nagai is enrolled with Medicare (CMS data updated October 2, 2026).
- 2799 W Grand BlvdDetroit, MI 48202 (313) 916‑2600
Group practices
Medicare enrollment lists Shunji Nagai as a member of this group (CMS data updated October 2, 2026).
- Henry Ford Health System2,570 clinicians in the group
Specialties
- General Surgeryprimary
Other general surgeons in Detroit
Clinicians with the same Medicare primary specialty in Detroit, MI — not a recommendation.
Other clinicians in Henry Ford Health System
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2001 (25 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1821433913 |
| 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