Dr Mark M Theiss, MD - Medicare Sports Medicine in Falls Church, VA

Dr Mark M Theiss, MD is a medicare enrolled "Orthopaedic Surgery - Sports Medicine" physician in Falls Church, Virginia. He went to Georgetown University School Of Medicine and graduated in 1975 and has 49 years of diverse experience with area of expertise as Sports Medicine. He is a member of the group practice Inova Health Care Services, Select Physical Therapy Holdings Inc and his current practice location is 3300 Gallows Rd, Falls Church, Virginia. You can reach out to his office (for appointments etc.) via phone at (703) 776-4001.

Dr Mark M Theiss is licensed to practice in Virginia (license number 0101036798) 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 1669534350.

Contact Information

Dr Mark M Theiss, MD
3300 Gallows Rd,
Falls Church, VA 22042-3300
(703) 776-4001
(703) 776-7113

Map and Direction




Physician's Profile

Full NameDr Mark M Theiss
GenderMale
SpecialitySports Medicine
Experience49 Years
Location3300 Gallows Rd, Falls Church, Virginia
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 M Theiss attended and graduated from Georgetown University School Of Medicine in 1975
  NPI Data:
  • NPI Number: 1669534350
  • Provider Enumeration Date: 12/16/2006
  • Last Update Date: 01/29/2022
  Medicare PECOS Information:
  • PECOS PAC ID: 5395883698
  • Enrollment ID: I20140617002262

Medical Identifiers

Medical identifiers for Dr Mark M Theiss such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1669534350NPI-NPPES
006499317MedicaidVA

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207X00000XOrthopaedic Surgery 0101036798 (Virginia)Secondary
207XX0005XOrthopaedic Surgery - Sports Medicine 0101036798 (Virginia)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Inova Alexandria HospitalAlexandria, VAHospital
Inova Fairfax HospitalFalls church, VAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Inova Health Care Services24663510931725
Select Physical Therapy Holdings Inc95370764011487

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 M Theiss allows following entities to bill medicare on his behalf.
Entity NameInova Health Care Services
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1952320061
PECOS PAC ID: 2466351093
Enrollment ID: O20080806000696

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 M Theiss 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 M Theiss, MD
Po Box 37174,
Baltimore, MD 21297-3174

Ph: (571) 423-5699
Dr Mark M Theiss, MD
3300 Gallows Rd,
Falls Church, VA 22042-3300

Ph: (703) 776-4001

Reviews and Comments


Orthopaedic Surgery Doctors in Falls Church, VA

Dr. Robert George Najarian, M.D.
Orthopedic Surgery
Medicare: Accepting Medicare Assignments
Practice Location: 3300 Gallows Rd, Falls Church, VA 22042
Phone: 703-776-4001    Fax: 703-776-7113
Dr. Sidney G Chetta, MD
Orthopedic Surgery
Medicare: Not Enrolled in Medicare
Practice Location: 201 N Washington St, Kaiser Permanente Falls Church Medical Center, Falls Church, VA 22046
Phone: 703-237-4000    
Dr. Steven K Neufeld, M.D.
Orthopedic Surgery
Medicare: Accepting Medicare Assignments
Practice Location: 2922 Telestar Ct, Falls Church, VA 22042
Phone: 703-769-8420    
Dr. Donald Avram Saroff, M.D.
Orthopedic Surgery
Medicare: Not Enrolled in Medicare
Practice Location: 201 N Washington St, Falls Church, VA 22046
Phone: 703-237-4000    Fax: 703-536-1400
Joseph B White, MD
Orthopedic Surgery
Medicare: Not Enrolled in Medicare
Practice Location: 5203 Leesburg Pike, #1601, Falls Church, VA 22041
Phone: 703-671-2225    
Daniel J Cuttica, D.O.
Orthopedic Surgery
Medicare: Accepting Medicare Assignments
Practice Location: 2292 Telestar Court, Falls Church, VA 22042
Phone: 703-584-2040    Fax: 703-553-8647

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.