ERNEST JOHN BUCK M.D.
NPI 1861504987
Emergency Medicine in Fremont, OH
About Ernest John Buck M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ERNEST JOHN BUCK M.D. (NPI 1861504987) is an individual emergency medicine provider in Fremont, Ohio, licensed in Ohio (35066347) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS, is affiliated with Ingalls Memorial Hospital, and maintains 6 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 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
Ernest John Buck M.d. 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
6Medicare enrollment records show Ernest Buck reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Niles, MI 49120
- Reassigned Medicare billing, Michigan enrollment
- 107 clinicians in this Medicare group
Saint Joseph, MI 49085
- Reassigned Medicare billing, Michigan enrollment
- 42 clinicians in this Medicare group
Calumet City, IL 60409
- Reassigned Medicare billing, Illinois enrollment
- 84 clinicians in this Medicare group
Gainesville, TX 76240
- Reassigned Medicare billing, Texas enrollment
- 1,193 clinicians in this Medicare group
Midland, TX 79707
- Reassigned Medicare billing, Texas enrollment
- 27 clinicians in this Medicare group
Midland, TX 79707
- Reassigned Medicare billing, Texas enrollment
- 25 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 4
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 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Ingalls Memorial Hospital
Acute Care Hospitals · Harvey, ILLakeland Hospital, St Joseph
Acute Care Hospitals · St Joseph, MIMidland Memorial Hospital
Acute Care Hospitals · Midland, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 43420 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
FREMONT, OH 43420
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 Ernest Buck's NPI number?
The NPI number for Ernest Buck is 1861504987. It was assigned to this individual provider in the NPPES registry on August 31, 2006.
Where is Ernest Buck located?
Ernest Buck practices at 715 S Taft Ave, Fremont, OH 43420. The listed phone number is (419) 334-6621.
What is Ernest Buck's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Ernest Buck enrolled in Medicare?
Yes. Ernest Buck 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 Ernest Buck's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ernest Buck reassigns Medicare benefits to 6 organizations: Lakeland Community Hospital Watervliet (Niles, MI), Epmg Southwest Michigan PLLC (Saint Joseph, MI), Harvey Emergency Physicians, PLLC (Calumet City, IL), Acs Primary Care Physicians Southwest, PA (Gainesville, TX), Wes Tex Urgent Care, PLLC (Midland, TX) and 1 more organization, 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 Ernest Buck's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ernest Buck accept?
Health plans from Baylor Scott and White Health Plan, Blue Care Network of Michigan, Blue Cross Blue Shield of Michigan Mutual Insurance Company and Blue Cross and Blue Shield of Texas list Ernest Buck 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 Ernest Buck affiliated with any hospitals?
According to CMS data, Ernest Buck is affiliated with Ingalls Memorial Hospital, Lakeland Hospital, St Joseph and Midland Memorial Hospital.
When was this NPI record last updated?
The NPPES record for Ernest Buck was last updated on February 7, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 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.
# Ernest John Buck, M.D. · NPI 1861504987
Emergency Medicine physician in Fremont, Ohio. Individual provider, active in the CMS NPPES registry since August 31, 2006.
## Identity
- **NPI:** 1861504987 (Entity type: Individual)
- **Enumerated:** August 31, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 35066347 (Ohio)
- **Sole proprietor:** No
## Practice location
- **Address:** 715 S TAFT AVE, Fremont, OH 43420-3200
- **Phone:** (419) 334-6621 · **Fax:** (419) 334-6649
## 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:** 6 organizations under Medicare reassignment (form CMS-855R): Lakeland Community Hospital Watervliet (NPI 1538592753, Niles, MI); Epmg Southwest Michigan PLLC (NPI 1316405103, Saint Joseph, MI); Harvey Emergency Physicians, PLLC (NPI 1184281651, Calumet City, IL); Acs Primary Care Physicians Southwest, PA (NPI 1538101019, Gainesville, TX); Wes Tex Urgent Care, PLLC (NPI 1912421645, Midland, TX); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Loma Linda University School Of Medicine, class of 1992
## Record status
- **NPPES last updated:** February 7, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1861504987) · Data from the CMS NPPES public registry.