Katharine E. Macmillan, DO
Family Medicine Physician · Saginaw, MI
Katharine E. Macmillan, DO is a family medicine physician with a practice address in Saginaw, Michigan, and NPI 1902426257, issued on Apr 16, 2020. Check the license (Michigan 5101027845, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Katharine E. Macmillan
- Credential
- DO
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License numbers
- 5101027845 MI
4158 WV
Self-reported in NPPES; status is on the state search - Practice location
- 2429 Trautner Dr, Saginaw, MI 48604
- Phone
- (989) 583-5514
- Enumerated
- Apr 16, 2020
- Record last updated
- Apr 16, 2024
- Fax
- (989) 583-1742
- Medicare enrollment
- Enrolled (PECOS I20240222003552); accepts Medicare assignment
- Medical or professional school
- Michigan State University College Of Osteopathic Medicine, 2020
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 6,013 in Michigan → Look up another NPI →
Also registered at 2429 Trautner Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Hall Hewett, FNP-BCFamily Nurse Practitioner1033501481
- Maria Lawrence, DOFamily Medicine Physician1942263801
- Veronica Lorenzo, MDFamily Medicine Physician1326036815
- Randall Nall, MDInternal Medicine Physician1831696772
- Kelsey NelsonFamily Nurse Practitioner1770316259
Verify Katharine E. Macmillan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 5101027845Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
19% fewer Medicare Part D claims than the average family medicine physician in 2024
2,873 Medicare Part D claims for 574 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 124 claims were for opioids.
Most prescribed
- Levothyroxine Sodium132 claims
- Atorvastatin Calcium121 claims
- Amlodipine Besylate91 claims
- Lisinopril90 claims
- Hydrocodone-Acetaminophen78 claims
- Simvastatin73 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Covenant Medical Center IncSaginaw, MI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katharine E. Macmillan among 6,013 family medicine physician records in Michigan
Katharine E. Macmillan, DO is one of 6,013 family medicine physician records with a practice address in Michigan. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 83% of them.
- NPI issued2020 · 83% of these records are older, 14% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2020 · median 2008 among the 3,493 with a school on file
- Record last updated2024 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
179 family medicine physician records list a practice address in Saginaw
They are 179 of the 6,008 NPPES records with a practice address in Saginaw, and 6,013 family medicine physician records in Michigan.
All 6,013 in Michigan → Every provider in Saginaw → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Wendy Biggs, M.D.Saginaw, MI 486041558380485
- Gary Brooks, M.D.Saginaw, MI 486041831173160
- Caio Goncalves, M.D.Saginaw, MI 486041730112244
- Larry Kelly, MDSaginaw, MI 486041508803149
- Maria Lawrence, DOSaginaw, MI 486041942263801
- Veronica Lorenzo, MDSaginaw, MI 486041326036815
- Joseph Natole, MDSaginaw, MI 486041700842622
- Bernard Noveloso, MDSaginaw, MI 486041740392190
Common questions
What is Katharine E. Macmillan, DO's NPI number?
Katharine E. Macmillan, DO's National Provider Identifier (NPI) is 1902426257, issued on Apr 16, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Katharine E. Macmillan, DO located?
The NPPES record lists a practice address at 2429 Trautner Dr, Saginaw, MI, 48604. Phone: (989) 583-5514. Providers update this record themselves, so call before visiting.
How can I verify Katharine E. Macmillan, DO's license?
NPPES lists Michigan license number 5101027845, as entered by the provider. Search the Michigan Board of Medicine (LARA) at https://aca-prod.accela.com/MILARA/GeneralProperty/PropertyLookUp.aspx?isLicensee=Y&TabName=APO. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Katharine E. Macmillan, DO prescribe under Medicare Part D?
In 2024, Katharine E. Macmillan, DO had 2,873 Medicare Part D claims for 574 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.