Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

John M O'Brien, MD

Individual provider Family Medicine Physician · NPI 1639268584

John M O'Brien, MD is a Family Medicine Physician in Chelsea, Michigan. Licensed in Michigan. Registered with an NPI since 2006.

Licensed in
MI
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

14700 E Old US 12
Chelsea, MI 48118-1185
Phone: (734) 475-1321
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 4301043586 (MI)
Adolescent Medicine (Family Medicine) Physician Taxonomy 207QA0000X · Licence 4301043586 (MI)

Record details

NPI number1639268584
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 11, 2006
Last updated in NPPESMarch 27, 2012
Mailing address3621 S State St, 700 Kms Place, Ann Arbor, MI 48108

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