Dr Warren Orrin Ferris, MD - Medicare Rheumatology in Silver Spring, MD

Dr Warren Orrin Ferris, MD is a medicare enrolled "Internal Medicine" physician in Silver Spring, Maryland. He went to University Of Missouri, Columbia School Of Medicine and graduated in 1976 and has 48 years of diverse experience with area of expertise as Rheumatology. He is a member of the group practice Medstar Medical Group Ii Llc and his current practice location is 3305 North Leisure World Boulevard, Silver Spring, Maryland. You can reach out to his office (for appointments etc.) via phone at (301) 598-1554.

Dr Warren Orrin Ferris is licensed to practice in Maryland (license number D31918) 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 1487744280.

Contact Information

Dr Warren Orrin Ferris, MD
3305 North Leisure World Boulevard,
Silver Spring, MD 20906
(301) 598-1554
(301) 558-1509

Map and Direction




Physician's Profile

Full NameDr Warren Orrin Ferris
GenderMale
SpecialityRheumatology
Experience48 Years
Location3305 North Leisure World Boulevard, Silver Spring, Maryland
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 Warren Orrin Ferris attended and graduated from University Of Missouri, Columbia School Of Medicine in 1976
  NPI Data:
  • NPI Number: 1487744280
  • Provider Enumeration Date: 10/13/2006
  • Last Update Date: 06/19/2013
  Medicare PECOS Information:
  • PECOS PAC ID: 3577758515
  • Enrollment ID: I20101116000566

Medical Identifiers

Medical identifiers for Dr Warren Orrin Ferris such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1487744280NPI-NPPES
607100700MedicaidMD

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine D31918 (Maryland)Primary
207RR0500XInternal Medicine - Rheumatology D31918 (Maryland)Secondary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Medstar Montgomery Medical CenterOlney, MDHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Medstar Medical Group Ii Llc05474138251790

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 Warren Orrin Ferris allows following entities to bill medicare on his behalf.
Entity NameMedstar Medical Group Ii Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1184046187
PECOS PAC ID: 0547413825
Enrollment ID: O20130117000415

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 Warren Orrin Ferris 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 Warren Orrin Ferris, MD
3305 North Leisure World Boulevard,
Silver Spring, MD 20906

Ph: (301) 598-1554
Dr Warren Orrin Ferris, MD
3305 North Leisure World Boulevard,
Silver Spring, MD 20906

Ph: (301) 598-1554

Reviews and Comments


Internal Medicine Doctors in Silver Spring, MD

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Phone: 301-796-1387    

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).

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