Mary Margaret Oneill, CFNP - Nurse Practitioner in Adelphi, MD

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Mary Margaret Oneill, CFNP is a Nurse Practitioner based in Adelphi, Maryland. Mary Margaret Oneill is licensed to practice in Maryland (license number AC000300) and her current practice location is 1801 Metzerott Road, Adelphi, Maryland. She can be reached at her office (for appointments etc.) via phone at (301) 434-0500.

NPI number for Mary Margaret Oneill is 1841374261 and her current mailing address is 2603 N Winchester Street, Arlington, Virginia. She does not participate in medicare program and thus does not accept medicare assignments. Her NPI Number is 1841374261.

Contact Information

Mary Margaret Oneill, CFNP
1801 Metzerott Road,
Adelphi, MD 20783
(301) 434-0500
(301) 434-1962

Map and Direction




Provider's Profile

Full NameMary Margaret Oneill
GenderFemale
SpecialityNurse Practitioner
Location1801 Metzerott Road, Adelphi, Maryland
Accepts Medicare AssignmentsDoes not participate in Medicare Program. She may not accept medicare assignment.
  NPI Data:
  • NPI Number: 1841374261
  • Provider Enumeration Date: 10/24/2006
  • Last Update Date: 07/08/2007

Medical Identifiers

Medical identifiers for Mary Margaret Oneill such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1841374261NPI-NPPES
P00297838OtherRR MEDICARE

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
363L00000XNurse Practitioner AC000300 (Maryland)Primary
363L00000XNurse Practitioner 0024129639 (Virginia)Secondary

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. Mary Margaret Oneill is NOT enrolled with medicare and thus cannot prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Mary Margaret Oneill, CFNP
2603 N Winchester Street,
Arlington, VA 22213

Ph: (703) 536-7702		Mary Margaret Oneill, CFNP
1801 Metzerott Road,
Adelphi, MD 20783

Ph: (301) 434-0500

Reviews and Comments


Nurse Practitioner Nurses in Adelphi, MD

Mrs. Tinuolu T Shokunbi, NP-C
Nurse Practitioner
Medicare: May Accept Medicare Assignments
Practice Location: 6401 New Hampshire Ave Ste 100, Adelphi, MD 20783
Phone: 301-466-3593    
Mr. William Sherwood Smith, FNP
Nurse Practitioner
Medicare: Accepting Medicare Assignments
Practice Location: 8908 Riggs Rd, Adelphi, MD 20783
Phone: 214-693-5790    

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.