KATHARINE E MACMILLAN DO
NPI 1902426257
Family Medicine in Saginaw, MI
About Katharine E Macmillan Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KATHARINE E MACMILLAN DO (NPI 1902426257) is an individual family medicine provider in Saginaw, Michigan, licensed in Michigan (5101027845) and active in the NPI registry since April 2020. She is enrolled in Medicare PECOS, is affiliated with Mclaren Bay Region, and is a graduate of Michigan State University College Of Osteopathic Medicine (2020).
NPPES Registry Identity
Specialties & Licenses
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
Katharine E Macmillan Do 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 Reassignment
Medicare enrollment records show Katharine Macmillan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Saginaw, MI 48604
- Reassigned Medicare billing, Michigan enrollment
- 720 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 7
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mclaren Bay Region
Acute Care Hospitals · Bay City, MICovenant Medical Center
Acute Care Hospitals · Saginaw, MIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 48604 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 10
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Katharine Macmillan's NPI number?
The NPI number for Katharine Macmillan is 1902426257. It was assigned to this individual provider in the NPPES registry on April 16, 2020.
Where is Katharine Macmillan located?
Katharine Macmillan practices at 2429 Trautner Dr, Saginaw, MI 48604. The listed phone number is (989) 583-5514.
What is Katharine Macmillan's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Katharine Macmillan enrolled in Medicare?
Yes. Katharine Macmillan 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 organization bills Medicare for Katharine Macmillan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Katharine Macmillan reassigns Medicare benefits to Covenant Medical Center, Inc (Saginaw, MI). The 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 Katharine Macmillan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Katharine Macmillan accept?
Health plans from Blue Cross Blue Shield of Michigan Mutual Insurance Company and Priority Health list Katharine Macmillan 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 Katharine Macmillan affiliated with any hospitals?
According to CMS data, Katharine Macmillan is affiliated with Mclaren Bay Region and Covenant Medical Center.
When was this NPI record last updated?
The NPPES record for Katharine Macmillan was last updated on April 16, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Katharine E Macmillan, DO · NPI 1902426257
Family Medicine physician in Saginaw, Michigan. Individual provider, active in the CMS NPPES registry since April 16, 2020.
## Identity
- **NPI:** 1902426257 (Entity type: Individual)
- **Enumerated:** April 16, 2020
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 5101027845 (Michigan)
- **Sole proprietor:** No
## Practice location
- **Address:** 2429 TRAUTNER DR, Saginaw, MI 48604-9596
- **Phone:** (989) 583-5514 · **Fax:** (989) 583-1742
## 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:** Covenant Medical Center, Inc (NPI 1881126597, Saginaw, MI), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Michigan State University College Of Osteopathic Medicine, class of 2020
## Record status
- **NPPES last updated:** April 16, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1902426257) · Data from the CMS NPPES public registry.