Mark Stephen Obrien, DO - Medicare Internal Medicine in Ottumwa, IA

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Mark Stephen Obrien, DO is a medicare enrolled "Internal Medicine" physician in Ottumwa, Iowa. His current practice location is 1001 E Pennsylvalia Ave, Ottumwa Regional Medical Center, Ottumwa, Iowa. You can reach out to his office (for appointments etc.) via phone at (641) 684-2300.

Mark Stephen Obrien is licensed to practice in Iowa (license number 02335) and he also participates in the medicare program. He does not accept medicare assignments directly but he may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. His NPI Number is 1659444206.

Contact Information

Mark Stephen Obrien, DO
1001 E Pennsylvalia Ave, Ottumwa Regional Medical Center,
Ottumwa, IA 52501
(641) 684-2300
Not Available

Map and Direction




Physician's Profile

Full NameMark Stephen Obrien
GenderMale
SpecialityInternal Medicine
Location1001 E Pennsylvalia Ave, Ottumwa, Iowa
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1659444206
  • Provider Enumeration Date: 11/15/2006
  • Last Update Date: 07/20/2021
  Medicare PECOS Information:
  • PECOS PAC ID: 3375737398
  • Enrollment ID: I20101103000477

Medical Identifiers

Medical identifiers for Mark Stephen Obrien such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1659444206NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207Q00000XFamily Medicine R5C60 (Missouri)Secondary
207R00000XInternal Medicine 02335 (Iowa)Primary

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. Mark Stephen Obrien allows following entities to bill medicare on his behalf.
Entity NameFort Madison Community Hospital
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1083764393
PECOS PAC ID: 8729971841
Enrollment ID: O20040203001066
Entity NameMercy Medical Center-centerville
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1528018801
PECOS PAC ID: 9739077652
Enrollment ID: O20040310000762
Entity NameIowa Emergency Physicians Llp
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1386879427
PECOS PAC ID: 5991856064
Enrollment ID: O20090701000057

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. Mark Stephen Obrien 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
Mark Stephen Obrien, DO
11432 295th Road,
Unionville, MO 63565

Ph: (660) 947-2138		Mark Stephen Obrien, DO
1001 E Pennsylvalia Ave, Ottumwa Regional Medical Center,
Ottumwa, IA 52501

Ph: (641) 684-2300

Reviews and Comments


Internal Medicine Doctors in Ottumwa, IA

Stanley A Blew, MD
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Medicare: Not Enrolled in Medicare
Practice Location: 1005 Pennsylvania Ave, Suite 104, Ottumwa, IA 52501
Phone: 641-682-4594    Fax: 641-682-2123
Kenneth S Wayne, MD
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 1005 Pennsylvania Ave, Suite 104, Ottumwa, IA 52501
Phone: 641-682-4594    Fax: 641-682-2123
Shazia Abbas, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1005 Pennsylvania Ave, Suite 104, Ottumwa, IA 52501
Phone: 641-682-4594    Fax: 641-682-2123
Nisreen M.a. H. Yaghmour, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1005 Pennslyvania Ave, 207, Ottumwa, IA 52501
Phone: 641-682-5349    Fax: 515-246-4474
Dr. Donald Conklin, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1001 Pennsylvania Ave, Ottumwa, IA 52501
Phone: 641-984-2341    
Jashim U Ahmed, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1005 Pennsylvania Ave, Suite 104, Ottumwa, IA 52501
Phone: 641-682-4594    Fax: 641-682-2123
Gerald Mathew Paluska, MD
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 312 E Alta Vista, Addiction Medicine Clinic, Ottumwa, IA 52501
Phone: 641-684-3170    Fax: 641-684-3173

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.