DR. LEIGH MARIE SEAMON D.O.
NPI 1821147422
Obstetrics & Gynecology - Gynecologic Oncology in Grand Rapids, MI
About Dr. Leigh Marie Seamon D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. LEIGH MARIE SEAMON D.O. (NPI 1821147422) is an individual gynecologic oncology provider in Grand Rapids, Michigan, licensed in Ohio (34.008774) and active in the NPI registry since January 2007. She is enrolled in Medicare PECOS, is affiliated with Corewell Health Zeeland Hospital, and is a graduate of Other (2000).
NPPES Registry Identity
Specialties & Licenses
Other Names 1
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
Dr. Leigh Marie Seamon D.o. 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
8Medicare enrollment records show Leigh Seamon reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Grand Rapids, MI 49503
- Reassigned Medicare billing, Michigan enrollment
- 104 clinicians in this Medicare group
Grand Rapids, MI 49503
- Reassigned Medicare billing, Michigan enrollment
- 405 clinicians in this Medicare group
Grand Rapids, MI 49503
- Reassigned Medicare billing, Michigan enrollment
- 737 clinicians in this Medicare group
Wyoming, MI 49548
- Reassigned Medicare billing, Michigan enrollment
- 685 clinicians in this Medicare group
Greenville, MI 48838
- Reassigned Medicare billing, Michigan enrollment
- 242 clinicians in this Medicare group
Grant, MI 49327
- Reassigned Medicare billing, Michigan enrollment
- 180 clinicians in this Medicare group
Reed City, MI 49677
- Reassigned Medicare billing, Michigan enrollment
- 132 clinicians in this Medicare group
Ludington, MI 49431
- Reassigned Medicare billing, Michigan enrollment
- 168 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 8
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 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Corewell Health Zeeland Hospital
Acute Care Hospitals · Zeeland, MISpectrum Health United Hospital
Acute Care Hospitals · Greenville, MISpectrum Health
Acute Care Hospitals · Grand Rapids, MIMercy Health Saint Mary's
Acute Care Hospitals · Grand Rapids, MICorewell Health Reed City Hospital
Critical Access Hospitals · Reed City, MIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 49503 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
GRAND RAPIDS, MI 49503
GRAND RAPIDS, MI 49503
GRAND RAPIDS, MI 49503
GRAND RAPIDS, MI 49503
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 Leigh Seamon's NPI number?
The NPI number for Leigh Seamon is 1821147422. It was assigned to this individual provider in the NPPES registry on January 10, 2007. The provider is also known as Dr. Leigh Marie Glasscock D.O..
Where is Leigh Seamon located?
Leigh Seamon practices at 145 Michigan St NE Suite 6300, Grand Rapids, MI 49503. The listed phone number is (616) 486-6000.
What is Leigh Seamon's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology, specializing in Gynecologic Oncology, with taxonomy code 207VX0201X.
Is Leigh Seamon enrolled in Medicare?
Yes. Leigh Seamon 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 Leigh Seamon's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Leigh Seamon reassigns Medicare benefits to 8 organizations: Cancer & Hematology Centers Of Western Mi, P.C. (Grand Rapids, MI), Spectrum Health Hospitals (Grand Rapids, MI), Advantage Health/Saint Mary's Medical Group (Grand Rapids, MI), Metropolitan Hospital (Wyoming, MI), Spectrum Health United (Greenville, MI) and 3 more organizations, listed in the Medicare section above. 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 Leigh Seamon's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Leigh Seamon 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 Leigh Seamon 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 Leigh Seamon affiliated with any hospitals?
According to CMS data, Leigh Seamon is affiliated with Corewell Health Zeeland Hospital, Spectrum Health United Hospital, Spectrum Health, Mercy Health Saint Mary's and Corewell Health Reed City Hospital.
When was this NPI record last updated?
The NPPES record for Leigh Seamon was last updated on April 2, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 months 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.
# Dr. Leigh Marie Seamon, D.O. · NPI 1821147422
Gynecologic Oncology physician in Grand Rapids, Michigan. Individual provider, active in the CMS NPPES registry since January 10, 2007.
## Identity
- **NPI:** 1821147422 (Entity type: Individual)
- **Enumerated:** January 10, 2007
- **Primary specialty:** Obstetrics & Gynecology - Gynecologic Oncology · taxonomy 207VX0201X
- **State license:** 34.008774 (Ohio)
- **Sole proprietor:** No
## Practice location
- **Address:** 145 MICHIGAN ST NE, SUITE 6300, Grand Rapids, MI 49503-2562
- **Phone:** (616) 486-6000 · **Fax:** (616) 486-2065
## 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:** 8 organizations under Medicare reassignment (form CMS-855R): Cancer & Hematology Centers Of Western Mi, P.C. (NPI 1528018389, Grand Rapids, MI); Spectrum Health Hospitals (NPI 1558407189, Grand Rapids, MI); Advantage Health/Saint Mary's Medical Group (NPI 1376862151, Grand Rapids, MI); Metropolitan Hospital (NPI 1114947538, Wyoming, MI); Spectrum Health United (NPI 1538436852, Greenville, MI); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2000
## Record status
- **NPPES last updated:** April 2, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1821147422) · Data from the CMS NPPES public registry.