MARK E OBRIEN (MD) – Internal Medicine Physician, NPI 1841221348
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
7,218 INTERNAL MEDICINE in MI
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Provider Addresses for MARK E OBRIEN (MD)
50, Industrial Park Drive, Bangor, Van Buren County, Michigan, 49013, United States
BANGOR, MI 49013
Phone: (269) 427-7937
Fax: (269) 427-5180
Type: Mailing
800, Paw Paw Avenue, Benton Harbor, Benton Charter Township, Berrien County, Michigan, 49022, United States
BENTON HARBOR, MI 490223881
Phone: (269) 927-5400
Fax: (269) 927-5493
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 3 Open Payments records for all available years, with a total value of $56.
Total Amount is formed as General ($56) + Research ($0) + Ownership ($0) = $56.
Last reported payment date: 2024-09-30 • Largest payer in this snapshot: Merck Sharp & Dohme LLC ($25).
Total Amount
$56
General + Research + Ownership
Payments
3
Total payment records
General Amount
$56
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-09-30
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Merck Sharp & Dohme LLC | $25 |
| Exact Sciences Corporation | $16 |
| Lilly USA, LLC | $15 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2004-02-23
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20040223000279 | I | Internal Medicine | MI | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 83036 | Hemoglobin a1c level | 125 | 72 | $0 |
| 81002 | Urinalysis, manual test | 27 | 24 | $0 |
Insurance plans in this area (ZIP 49013)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| O B S T E T R I C S/ G Y N E C O L O G Y | MI | |
| Family Practice | MI | |
| Mental Health Counselor | MI | |
| Internal Medicine | MI | |
| Family Practice | MI | |
| Family Practice | MI | |
| Family Practice | MI | |
| - | MI | |
| Family Practice | MI | |
| - | MI |
Reviews
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