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

Mark Langlois, MD

Individual provider Family Medicine Physician · NPI 1295154656

Mark Langlois, MD is a Family Practice in Frankfort, Michigan. Qualified in 2013, 13 years ago. Practices with Sound Inpatient Physicians-Michigan PLLC, a 170-clinician group and accepts Medicare assignment. Licensed in Michigan.

Years since qualifying
13
Licensed in
MI
In the registry since
2014
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location PO Box

The provider listed a PO Box rather than a street location, so this is not a walk-in address.

PO Box 1652
Frankfort, MI 49635-1652
Phone: (231) 955-9565
Fax: (231) 220-9568
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 4301105292 (MI)

Record details

NPI number1295154656
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedApril 14, 2014
Last updated in NPPESMay 20, 2026
Certification dateMay 20, 2026
Mailing addressPo Box 1652, Frankfort, MI 49635-1652

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyFAMILY PRACTICE
Medical schoolOTHER
Graduated 2013 (13 years in practice)
Group practice Sound Inpatient Physicians-Michigan Pllc — 170 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Other providers in Frankfort