BARTHOLOMEW DAVID SAK MD
NPI 1093755167
Hospitalist in Muskegon, MI
About Bartholomew David Sak Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
BARTHOLOMEW DAVID SAK MD (NPI 1093755167) is an individual hospitalist provider in Muskegon, Michigan, licensed in Michigan (4301068868) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS, is affiliated with Maui Memorial Medical Center, and is a graduate of Other (1993).
NPPES Registry Identity
Specialties & Licenses 2
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Bartholomew David Sak Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
7Medicare enrollment records show Bartholomew Sak reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Muskegon, MI 49444
- Reassigned Medicare billing, Michigan enrollment
- 72 clinicians in this Medicare group
Fruitport, MI 49415
- Reassigned Medicare billing, Michigan enrollment
- 130 clinicians in this Medicare group
Muskegon, MI 49445
- Reassigned Medicare billing, Michigan enrollment
- 2,446 clinicians in this Medicare group
Kalamazoo, MI 49048
- Reassigned Medicare billing, Michigan enrollment
- 596 clinicians in this Medicare group
Adrian, MI 49221
- Reassigned Medicare billing, Michigan enrollment
- 237 clinicians in this Medicare group
Iron River, MI 49935
- Reassigned Medicare billing, Michigan enrollment
- 264 clinicians in this Medicare group
Lihue, HI 96766
- Reassigned Medicare billing, Hawaii enrollment
- 298 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 5
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Maui Memorial Medical Center
Acute Care Hospitals · Wailuku, HITrinity Health Muskegon Hospital
Acute Care Hospitals · Muskegon, MIMercy Health Lakeshore Campus
Critical Access Hospitals · Shelby, MIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 49444 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MUSKEGON, MI 49444
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Bartholomew Sak's NPI number?
The NPI number for Bartholomew Sak is 1093755167. It was assigned to this individual provider in the NPPES registry on June 7, 2006.
Where is Bartholomew Sak located?
Bartholomew Sak practices at 1500 E Sherman Blvd, Muskegon, MI 49444. The listed phone number is (231) 672-3883.
What is Bartholomew Sak's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Bartholomew Sak enrolled in Medicare?
Yes. Bartholomew Sak is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Bartholomew Sak's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Bartholomew Sak reassigns Medicare benefits to 7 organizations: Mercy Specialty Services (Muskegon, MI), Mercy Physician Network (Fruitport, MI), Spectrum Health Primary Care Partners (Muskegon, MI), Sound Inpatient Physicians-Michigan, PLLC (Kalamazoo, MI), Hospitalist Medicine Physicians Of Michigan, PLLC (Adrian, MI) and 2 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Bartholomew Sak's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Bartholomew Sak accept?
Health plans from Oscar Insurance Company and Priority Health list Bartholomew Sak as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Bartholomew Sak affiliated with any hospitals?
According to CMS data, Bartholomew Sak is affiliated with Maui Memorial Medical Center, Trinity Health Muskegon Hospital and Mercy Health Lakeshore Campus.
When was this NPI record last updated?
The NPPES record for Bartholomew Sak was last updated on April 22, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Bartholomew David Sak, MD · NPI 1093755167
Hospitalist physician in Muskegon, Michigan. Individual provider, active in the CMS NPPES registry since June 7, 2006.
## Identity
- **NPI:** 1093755167 (Entity type: Individual)
- **Enumerated:** June 7, 2006
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** 4301068868 (Michigan)
- **Sole proprietor:** No
## Practice location
- **Address:** 1500 E SHERMAN BLVD, Muskegon, MI 49444-1849
- **Phone:** (231) 672-3883 · **Fax:** (231) 672-3973
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 7 organizations under Medicare reassignment (form CMS-855R): Mercy Specialty Services (NPI 1629010384, Muskegon, MI); Mercy Physician Network (NPI 1639502701, Fruitport, MI); Spectrum Health Primary Care Partners (NPI 1386194538, Muskegon, MI); Sound Inpatient Physicians-Michigan, PLLC (NPI 1093967861, Kalamazoo, MI); Hospitalist Medicine Physicians Of Michigan, PLLC (NPI 1013180181, Adrian, MI); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1993
## Record status
- **NPPES last updated:** April 22, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1093755167) · Data from the CMS NPPES public registry.