Dr Mark S O'brien, MD - Medicare Family Practice in Carmel, IN

Dr Mark S O'brien, MD is a medicare enrolled "Family Medicine" physician in Carmel, Indiana. He went to Indiana University School Of Medicine and graduated in 1988 and has 36 years of diverse experience with area of expertise as Family Practice. He is a member of the group practice Legacy Healthcare Services Inc, Indiana University Health Care Associates Inc and his current practice location is 11725 N Illinois St Ste 250, Carmel, Indiana. You can reach out to his office (for appointments etc.) via phone at (317) 688-5300.

Dr Mark S O'brien is licensed to practice in Indiana (license number 01037757A) 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 1124129267.

Contact Information

Dr Mark S O'brien, MD
11725 N Illinois St Ste 250,
Carmel, IN 46032-3015
(317) 688-5300
(317) 688-5313

Map and Direction




Physician's Profile

Full NameDr Mark S O'brien
GenderMale
SpecialityFamily Practice
Experience36 Years
Location11725 N Illinois St Ste 250, Carmel, Indiana
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 S O'brien attended and graduated from Indiana University School Of Medicine in 1988
  NPI Data:
  • NPI Number: 1124129267
  • Provider Enumeration Date: 09/25/2006
  • Last Update Date: 01/06/2021
  Medicare PECOS Information:
  • PECOS PAC ID: 5496812877
  • Enrollment ID: I20090330000617

Medical Identifiers

Medical identifiers for Dr Mark S O'brien such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1124129267NPI-NPPES
200033390MedicaidIN

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207Q00000XFamily Medicine 01037757A (Indiana)Primary
2083P0500XPreventive Medicine - Preventive Medicine/occupational Environmental Medicine 01037757A (Indiana)Secondary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Indiana University Health North HospitalCarmel, INHospital
Indiana University HealthIndianapolis, INHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Legacy Healthcare Services Inc21633397223341
Indiana University Health Care Associates Inc5799755864905

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 S O'brien allows following entities to bill medicare on his behalf.
Entity NameIndiana University Health Care Associates Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1902032832
PECOS PAC ID: 5799755864
Enrollment ID: O20040727000955
Entity NamePic Indiana Pc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1942546890
PECOS PAC ID: 3476790239
Enrollment ID: O20130515000110

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 S 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 S O'brien, MD
250 N Shadeland Ave,
Indianapolis, IN 46219-4959

Ph: () -
Dr Mark S O'brien, MD
11725 N Illinois St Ste 250,
Carmel, IN 46032-3015

Ph: (317) 688-5300

Reviews and Comments


Family Medicine Doctors in Carmel, IN

Amanda Houchens, M.D.
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Medicare: Accepting Medicare Assignments
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Phone: 317-705-4550    Fax: 317-705-4559
Sanju J Daftari, MD
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Medicare: Accepting Medicare Assignments
Practice Location: 11911 N Meridian St, Suite 150, Carmel, IN 46032
Phone: 317-621-6701    Fax: 317-621-6707
Peiyi Hu, MD
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Practice Location: 12188a N Meridian St Ste 355, Carmel, IN 46032
Phone: 317-621-3809    
Rachel Land, DO
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Medicare: Medicare Enrolled
Practice Location: 12188b N Meridian St Ste 280, Carmel, IN 46032
Phone: 317-705-4550    Fax: 317-705-4559
Heather Rae Schumann, MD
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Medicare: Accepting Medicare Assignments
Practice Location: 13250 Hazel Dell Pkwy Ste 104, Carmel, IN 46033
Phone: 317-415-6900    
Robert D Habig, MD
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Medicare: Medicare Enrolled
Practice Location: 15229 Westfield Blvd, Carmel, IN 46032
Phone: 317-867-1236    Fax: 317-896-1299
Erica Dryden Leazenby, MD
Family Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 13250 Hazel Dell Pkwy, Suite 104, Carmel, IN 46033
Phone: 317-415-6900    Fax: 317-415-6910

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.