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

Dr. Mark W Lay, MD

Individual provider Family Medicine Physician · NPI 1003803313

Dr. Mark W Lay, MD is a Family Medicine Physician in Cassopolis, Michigan. Licensed in Michigan, New York and Wisconsin. Registered with an NPI since 2005.

Licensed in
MI, NY, WI
In the registry since
2005
Specialties on file
3
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

117 S Broadway St
Cassopolis, MI 49031-1242
Phone: (269) 445-0771
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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 4301073557 (MI)
Family Medicine Physician Taxonomy 207Q00000X · Licence 236771 (NY)
Family Medicine Physician Taxonomy 207Q00000X · Licence 31145 (WI)

Record details

NPI number1003803313
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 3, 2005
Last updated in NPPESJuly 8, 2007
Mailing address117 S Broadway St, Cassopolis, MI 49031-1242

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