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

Bartholomew David Sak, MD

Individual provider Hospitalist Physician · NPI 1093755167

Bartholomew David Sak, MD is an Internal Medicine in Muskegon, Michigan. Qualified in 1993, 33 years ago. Practices with Mercy Specialty Services, a 84-clinician group and accepts Medicare assignment. Licensed in Michigan.

Years since qualifying
33
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.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

1500 E Sherman Blvd
Muskegon, MI 49444-1849
Phone: (231) 672-3883
Fax: (231) 672-3973
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

Hospitalist Physician (primary) Taxonomy 208M00000X · Licence 4301068868 (MI)
Internal Medicine Physician Taxonomy 207R00000X · Licence 4301068868 (MI)

Record details

NPI number1093755167
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 7, 2006
Last updated in NPPESApril 22, 2022
Certification dateApril 22, 2022
Mailing address1560 E Sherman Blvd Ste 240, Muskegon, MI 49444-1854

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Also practisesHOSPITALIST
Medical schoolOTHER
Graduated 1993 (33 years in practice)
Group practice Mercy Specialty Services — 84 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

Other providers in Muskegon