Quick answers
- Which hospitals does Mark D. Castellani work at?
- Medicare's official clinician data lists Mark D. Castellani at 5 hospitals: Edward W Sparrow Hospital, Sparrow Ionia Hospital, University of Michigan Health - Sparrow Eaton, University of Michigan Health- Sparrow Clinton and University of Michigan Health-Sparrow Carson. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark D. Castellani see patients?
- Medicare's clinician data lists 9 practice locations, including Lansing, MI, Owosso, MI and Charlotte, MI. Call before your visit to confirm the address.
- What is Mark D. Castellani's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty, and also Internal Medicine.
- Does Mark D. Castellani accept Medicare assignment?
- Yes. Medicare's clinician data says Mark D. Castellani accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Mark D. Castellani?
- (989) 723-3613, as listed in official Medicare / NPI Registry data.
- What is Mark D. Castellani's NPI number?
- 1598763542. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark D. Castellani works
Medicare's Facility Affiliation Data lists Mark D. Castellani at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Edward W Sparrow HospitalLansing, MI · Acute Care Hospital · CCN 230230
- Sparrow Ionia HospitalIonia, MI · Critical Access Hospital · CCN 231331
- University of Michigan Health - Sparrow EatonCharlotte, MI · Critical Access Hospital · CCN 231327
- University of Michigan Health- Sparrow ClintonSaint Johns, MI · Critical Access Hospital · CCN 231326
- University of Michigan Health-Sparrow CarsonCarson City, MI · Acute Care Hospital · CCN 230208
Practice locations
Addresses where Mark D. Castellani is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 9; the Medicare profile lists all.
- 1140 E Michigan AveLansing, MI 48912
- 1210 W Saginaw StLansing, MI 48915
- 1210 W Saginaw St FlLansing, MI 48915
- 1215 E Michigan AveLansing, MI 48912
- 300 Health Park Dr, Suite 301Owosso, MI 48867 (989) 723‑3613
Group practices
Medicare enrollment lists Mark D. Castellani as a member of this group (CMS data updated 2026-10-02).
- Edward W Sparrow Hospital Association730 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Michigan →
Other cardiologists in Lansing
Clinicians with the same Medicare primary specialty in Lansing, MI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Wayne State University School Of Medicine |
| Graduation year | 1988 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1598763542 |
| 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 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- 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