Aathi Lakshmi Mariappan, - Medicare Internal Medicine in Oak Ridge, TN

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Aathi Lakshmi Mariappan, is a medicare enrolled "Internal Medicine" physician in Oak Ridge, Tennessee. Her current practice location is 990 Oak Ridge Tpke, Oak Ridge, Tennessee. You can reach out to her office (for appointments etc.) via phone at (865) 835-1000.

Aathi Lakshmi Mariappan is licensed to practice in Tennessee (license number 68290) and she also participates in the medicare program. She does not accept medicare assignments directly but she may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. Her NPI Number is 1023635224.

Contact Information

Aathi Lakshmi Mariappan,
990 Oak Ridge Tpke,
Oak Ridge, TN 37830-6976
(865) 835-1000
(865) 835-4303

Map and Direction




Physician's Profile

Full NameAathi Lakshmi Mariappan
GenderFemale
SpecialityInternal Medicine
Location990 Oak Ridge Tpke, Oak Ridge, Tennessee
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1023635224
  • Provider Enumeration Date: 07/03/2020
  • Last Update Date: 07/08/2025
  Medicare PECOS Information:
  • PECOS PAC ID: 4789030628
  • Enrollment ID: I20231027002803

Medical Identifiers

Medical identifiers for Aathi Lakshmi Mariappan such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1023635224NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 68290 (Tennessee)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. Aathi Lakshmi Mariappan allows following entities to bill medicare on her behalf.
Entity NameHospital Medicine Services Of Tennessee Pc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1528433802
PECOS PAC ID: 9234432881
Enrollment ID: O20160114002673

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. Aathi Lakshmi Mariappan 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
Aathi Lakshmi Mariappan,
990 Oak Ridge Tpke,
Oak Ridge, TN 37830-6976

Ph: (865) 835-4304		Aathi Lakshmi Mariappan,
990 Oak Ridge Tpke,
Oak Ridge, TN 37830-6976

Ph: (865) 835-1000

Reviews and Comments


Internal Medicine Doctors in Oak Ridge, TN

Chukwuma Umunakwe, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 990 Oak Ridge Tpke, Oak Ridge, TN 37830
Phone: 202-841-5854    
Dr. Michael Roger Thompson, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 200 New York Ave, Suite 200, Oak Ridge, TN 37830
Phone: 865-835-5400    Fax: 865-835-5401
Andrew W Dake, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 800 Oak Ridge Turnpike, Suite A-402, Oak Ridge, TN 37830
Phone: 865-637-8812    Fax: 865-824-4886
Aaron Joshua Smyth, D.O.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 801 Oak Ridge Tpke, Oak Ridge, TN 37830
Phone: 865-483-3172    Fax: 865-483-8689
Helen Susan Bidawid, M.D.
Internal Medicine
Medicare: May Accept Medicare Assignments
Practice Location: 990 Oak Ridge Tpke, Oak Ridge, TN 37830
Phone: 865-481-1000    
Victor W Mclaughlin, M.D.
Internal Medicine
Medicare: Medicare Enrolled
Practice Location: 80 Vermont Ave, Oak Ridge, TN 37830
Phone: 865-482-4078    Fax: 865-482-4960

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.