MARK E OBRIEN MD
NPI 1841221348
Internal Medicine in Benton Harbor, MI
About Mark E Obrien Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK E OBRIEN MD (NPI 1841221348) is an individual internal medicine provider in Benton Harbor, Michigan, licensed in Michigan (4301080677) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, is affiliated with Indiana University Health, and is a graduate of University Of Michigan Medical School (1984).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 3
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
Mark E Obrien 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 Reassignment
Medicare enrollment records show Mark Obrien reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Benton Harbor, MI 49022
- Reassigned Medicare billing, Michigan enrollment
- 101 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 2
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Indiana University Health
Acute Care Hospitals · Indianapolis, INLakeland Hospital, St Joseph
Acute Care Hospitals · St Joseph, MIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 49022 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 5
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.
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 Mark Obrien's NPI number?
The NPI number for Mark Obrien is 1841221348. It was assigned to this individual provider in the NPPES registry on July 5, 2006.
Where is Mark Obrien located?
Mark Obrien practices at 800 M 139, Benton Harbor, MI 49022. The listed phone number is (269) 927-5400.
What is Mark Obrien's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Mark Obrien enrolled in Medicare?
Yes. Mark Obrien 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 organization bills Medicare for Mark Obrien's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Obrien reassigns Medicare benefits to Intercare Community Health Network (Benton Harbor, MI). The 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 Mark Obrien's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mark Obrien accept?
Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian, Blue Care Network of Michigan and Blue Cross Blue Shield of Michigan Mutual Insurance Company and 3 other insurers list Mark Obrien 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 Mark Obrien affiliated with any hospitals?
According to CMS data, Mark Obrien is affiliated with Indiana University Health and Lakeland Hospital, St Joseph.
When was this NPI record last updated?
The NPPES record for Mark Obrien was last updated on January 7, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.
# Mark E Obrien, MD · NPI 1841221348
Internal Medicine physician in Benton Harbor, Michigan. Individual provider, active in the CMS NPPES registry since July 5, 2006.
## Identity
- **NPI:** 1841221348 (Entity type: Individual)
- **Enumerated:** July 5, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 4301080677 (Michigan)
- **Sole proprietor:** No
## Practice location
- **Address:** 800 M 139, Benton Harbor, MI 49022-3881
- **Phone:** (269) 927-5400 · **Fax:** (269) 927-5493
## 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:** Intercare Community Health Network (NPI 1902235328, Benton Harbor, MI), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Michigan Medical School, class of 1984
## Record status
- **NPPES last updated:** January 7, 2013
- **Other identifiers:** Medicaid 4605349 (MI); Medicare UPIN E18007; Medicare ID-Type Unspecified 0H06000042
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Source: [NPI Profile](https://npiprofile.com/npi/1841221348) · Data from the CMS NPPES public registry.