THOMAS B FOSTER MD
NPI 1033183371
Internal Medicine - Adolescent Medicine in Grand Rapids, MI
About Thomas B Foster Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
THOMAS B FOSTER MD (NPI 1033183371) is an individual adolescent medicine provider in Grand Rapids, Michigan, licensed in Michigan (4301086395) and active in the NPI registry since February 2006. He is enrolled in Medicare PECOS, is affiliated with Mercy Health Saint Mary's, and is a graduate of Other (1990).
NPPES Registry Identity
Specialties & Licenses 3
Other Identifiers 6
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Thomas B Foster Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Thomas Foster reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Byron Center, MI 49315
- Reassigned Medicare billing, Michigan enrollment
- 737 clinicians in this Medicare group
Fruitport, MI 49415
- Reassigned Medicare billing, Michigan enrollment
- 130 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mercy Health Saint Mary's
Acute Care Hospitals · Grand Rapids, MIReferred Medical Equipment & Supplies CMS DME claims 3
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BYRON CENTER, MI 49315
BYRON CENTER, MI 49315
BYRON CENTER, MI 49315
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Thomas Foster's NPI number?
The NPI number for Thomas Foster is 1033183371. It was assigned to this individual provider in the NPPES registry on February 14, 2006.
Where is Thomas Foster located?
Thomas Foster practices at 2373 64th St SW Ste 1300, Grand Rapids, MI 49315. The listed phone number is (616) 685-1350.
What is Thomas Foster's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Adolescent Medicine, with taxonomy code 207RA0000X.
Is Thomas Foster enrolled in Medicare?
Yes. Thomas Foster is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Thomas Foster's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Thomas Foster reassigns Medicare benefits to 2 organizations: Advantage Health Saint Mary's Medical Group (Byron Center, MI) and Mercy Physician Network (Fruitport, MI). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Thomas Foster's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Thomas Foster accept?
Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian, Blue Care Network of Michigan and Blue Cross Blue Shield of Michigan Mutual Insurance Company and 2 other insurers list Thomas Foster as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Thomas Foster affiliated with any hospitals?
According to CMS data, Thomas Foster is affiliated with Mercy Health Saint Mary's.
When was this NPI record last updated?
The NPPES record for Thomas Foster was last updated on September 11, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Thomas B Foster, MD · NPI 1033183371
Adolescent Medicine physician in Grand Rapids, Michigan. Individual provider, active in the CMS NPPES registry since February 14, 2006.
## Identity
- **NPI:** 1033183371 (Entity type: Individual)
- **Enumerated:** February 14, 2006
- **Primary specialty:** Internal Medicine - Adolescent Medicine · taxonomy 207RA0000X
- **State license:** 4301086395 (Michigan)
- **Sole proprietor:** No
## Practice location
- **Address:** 2373 64TH ST SW, STE 1300, Grand Rapids, MI 49315
- **Phone:** (616) 685-1350
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Advantage Health Saint Mary's Medical Group (NPI 1003515008, Byron Center, MI); Mercy Physician Network (NPI 1639502701, Fruitport, MI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1990
## Record status
- **NPPES last updated:** September 11, 2012
- **Other identifiers:** Medicare UPIN F30858 (IL); Other 07215036 (IL); Other 01EO (IL); and 3 more
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Source: [NPI Profile](https://npiprofile.com/npi/1033183371) · Data from the CMS NPPES public registry.