Dr Mark T O'brien, DO - Medicare Family Practice in Saint Clair, MI

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Dr Mark T O'brien, DO is a medicare enrolled "Family Medicine" physician in Saint Clair, Michigan. He graduated from medical school in 1986 and has 39 years of diverse experience with area of expertise as Family Practice. He is a member of the group practice Ascension River District Hospital and his current practice location is 1280 S 9th St, Saint Clair, Michigan. You can reach out to his office (for appointments etc.) via phone at (810) 326-0837.

Dr Mark T O'brien is licensed to practice in Michigan (license number 5101009744) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1255322509.

Contact Information

Dr Mark T O'brien, DO
1280 S 9th St,
Saint Clair, MI 48079-5368
(810) 326-0837
(810) 326-1534

Map and Direction




Physician's Profile

Full NameDr Mark T O'brien
GenderMale
SpecialityFamily Practice
Experience39 Years
Location1280 S 9th St, Saint Clair, Michigan
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Dr Mark T O'brien graduated from medical school in 1986
  NPI Data:
  • NPI Number: 1255322509
  • Provider Enumeration Date: 11/03/2005
  • Last Update Date: 02/25/2022
  Medicare PECOS Information:
  • PECOS PAC ID: 0042319964
  • Enrollment ID: I20070619000109

Medical Identifiers

Medical identifiers for Dr Mark T O'brien such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1255322509NPI-NPPES
2662631MedicaidMI

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207Q00000XFamily Medicine 5101009744 (Michigan)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Ascension River District HospitalEast china, MIHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Ascension River District Hospital044615340718

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Dr Mark T O'brien allows following entities to bill medicare on his behalf.
Entity NameAscension River District Hospital
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1265486245
PECOS PAC ID: 0446153407
Enrollment ID: O20040203000465
Entity NameMark T. O'brien, D.o., P.c.
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1396943015
PECOS PAC ID: 9335230598
Enrollment ID: O20070802000464
Entity NameSeton Health Corporation Of Southeastern Michigan
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1598177065
PECOS PAC ID: 2567689540
Enrollment ID: O20140814002590

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Dr Mark T O'brien is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Dr Mark T O'brien, DO
1280 S 9th St,
Saint Clair, MI 48079-5368

Ph: (810) 326-0837		Dr Mark T O'brien, DO
1280 S 9th St,
Saint Clair, MI 48079-5368

Ph: (810) 326-0837

Reviews and Comments


Family Medicine Doctors in Saint Clair, MI

Dr. Dawn Marie Lambrecht, MD
Family Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 955 Fred W Moore Hwy, Saint Clair, MI 48079
Phone: 810-326-0837    Fax: 810-326-1534
Mary Elizabeth Pietrangelo, MD
Family Medicine
Medicare: Medicare Enrolled
Practice Location: 1160 Oakwood Ln, Saint Clair, MI 48079
Phone: 313-720-3684    
Laura Lucio-reincke, M.D.
Family Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1163 S Carney Dr, Saint Clair, MI 48079
Phone: 810-561-8450    Fax: 810-329-0156

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.