Margaret Joan Best is a Registered Nurse practicing in Herndon, Virginia. The National Provider Identifier (NPI) is #1124170766, which was assigned on January 16, 2007, and the registration record was last updated on September 11, 2025. The practitioner's main practice location is at 435 A Carlisle Drive, Herndon, VA 20170; the contact telephone number is 7037156021, and the fax number is 7036200605. The primary taxonomy of Margaret Joan Best is Registered Nurse (163W00000X). Margaret Joan Best is licensed to practice in the state of Virginia (#0001054045), Virginia (#0015000685).
(1) A registered nurse is a person qualified by graduation from an accredited nursing school (depending upon schooling, a registered nurse may receive either a diploma from a hospital program, an associate degree in nursing (A.D.N.) or a Bachelor of Science degree in nursing (B.S.N.), who is licensed or certified by the state, and is practicing within the scope of that license or certification. R.N.'s assist patient in recovering and maintaining their physical or mental health. They assist physicians during treatments and examinations and administer medications. (2) A provider who is trained and educated in a formal nursing education program at an accredited school of nursing, passes a national certification examination, and is licensed by the state to practice nursing. The individual provides nursing services to patients or clients in areas such as health promotion, disease prevention, acute and chronic care and restoration and maintenance of health across the life span.
| NPI | 1124170766 |
| Entity Type | Individual |
| Provider Name | MRS. MARGARET JOAN BEST |
| Other Name |
MRS. PEGGY JOAN BEST (Other Name) |
| Gender | Female |
| Credential | CLINICAL NURSE SPECI |
| Practice Address |
435 A Carlisle Drive Herndon VA 20170 |
| Practice Telephone | 7037156021 |
| Practice Fax Number | 7036200605 |
| Mailing Address |
2011 Soapstone Drive Reston VA 20191 |
| Mailing Telephone | 7036201247 |
| Mailing Fax Number | 7036200605 |
| Enumeration Date | 2007-01-16 |
| Last Update Date | 2025-09-11 |
| Is Sole Proprietor | N |
| PAC ID |
2769479559 Medicare Provider Enrollment and Chain/Ownership System (PECOS) Associate Control (PAC) ID |
| Full Name | MARGARET J BEST |
| Primary Specialty | CERTIFIED CLINICAL NURSE SPECIALIST (CNS) |
| Address |
2011 Soapstone Dr Reston VA 20191-1329 |
| Primary | Code | Classification | Specialization | Taxonomy Group | License Number | License State |
|---|---|---|---|---|---|---|
| Y | 163W00000X | Registered Nurse | 0001054045 | VA | ||
| N | 364S00000X | Clinical Nurse Specialist | 0015000685 | VA |
| Code | 163W00000X |
| Taxonomy | Registered Nurse |
| Classification | Registered Nurse |
| Grouping | Nursing Service Providers |
| Definition: (1) A registered nurse is a person qualified by graduation from an accredited nursing school (depending upon schooling, a registered nurse may receive either a diploma from a hospital program, an associate degree in nursing (A.D.N.) or a Bachelor of Science degree in nursing (B.S.N.), who is licensed or certified by the state, and is practicing within the scope of that license or certification. R.N.'s assist patient in recovering and maintaining their physical or mental health. They assist physicians during treatments and examinations and administer medications. (2) A provider who is trained and educated in a formal nursing education program at an accredited school of nursing, passes a national certification examination, and is licensed by the state to practice nursing. The individual provides nursing services to patients or clients in areas such as health promotion, disease prevention, acute and chronic care and restoration and maintenance of health across the life span. |
| Notes: Sources: (2) American Nurses Association, American Nurses Credentialing Center, 1996 Certification Catalogue, and Rhea, Ott, and Shafritz, The Facts On File Dictionary of Health Care Management, New York: Facts On File Publications, 1988. |
| Code | 364S00000X |
| Taxonomy | Clinical Nurse Specialist |
| Classification | Clinical Nurse Specialist |
| Grouping | Physician Assistants & Advanced Practice Nursing Providers |
| Definition: A registered nurse who, through a graduate degree program in nursing, or through a formal post-basic education program or continuing education courses and clinical experience, is expert in a specialty area of nursing practice within one or more of the components of direct patient/client care, consultation, education, research and administration. |
| Notes: Sources: American Nurses Association, American Nurses Credentialing Center, 1996 Certification Catalogue and The Interagency Conference on Nursing Statistics. |
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| Street Address |
435 A CARLISLE DRIVE |
| City | HERNDON |
| State | VA |
| Zip Code | 20170 |
| Country | US |
| Provider Name | Address | Taxonomy | Enumeration Date |
|---|---|---|---|
| Joseph Andrew Signorino | 1453 Bluemont Ct, Herndon, VA 20170-3526 | Orthopedic Physical Therapist | 2025-08-08 |
| Stephanie H Elmaleh | 13039 Worldgate Dr, Herndon, VA 20170-4374 | Physical Therapist | 2023-05-31 |
| Caroline M. Tan | 297 Herndon Pkwy, Suite 202, Herndon, VA 20170-4474 | Psychiatry Physician | 2006-10-13 |
| Kylie Knight | 13039 Worldgate Dr, Herndon, VA 20170-4374 | Physical Therapist | 2023-11-29 |
| Kaleidoscope Art Therapy and Counseling | 1043 Sterling Rd Ste 203, Herndon, VA 20170-3842 | Mental Health Counselor | 2025-09-08 |
| Haley Elisabeth Kroll | 1043 Sterling Rd Ste 203, Herndon, VA 20170-3842 | Mental Health Counselor | 2025-09-08 |
| Concussion and Health LLC | 12603 Builders Rd, Herndon, VA 20170-2924 | Pediatric Sports Medicine Physician | 2026-02-12 |
| Sara Jane Mcmanus | 1317 Bayshire Ln, Herndon, VA 20170-3607 | Clinical Social Worker | 2006-10-02 |
| Ashly Mclean | 1319 Cassia St, Herndon, VA 20170-2524 | Psychiatric/Mental Health Nurse Practitioner | 2025-10-07 |
| Virginia Medical Transport, LLC. | 360 Herndon Pkwy Ste 700, Herndon, VA 20170 | Land Ambulance | 2018-05-22 |
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| Provider Name | Address | Taxonomy | Enumeration Date |
|---|---|---|---|
| Joan L. Sanchez · Joan S. Wilcox | 1205 E North St, Manteca, CA 95336-4932 | Physician Assistant | 2007-01-24 |
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| Joan S Luknic · Joan Jeptoo Sang | 2925 Chicago Ave, Minneapolis, MN 55407-1321 | Registered Nurse | 2012-03-13 |
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| Joan D Pelletier · Joan E Dupont | 9 Healthcare Drive, Suite 208, Biddeford, ME 04005-9450 | Pediatrics Physician | 2008-06-06 |
| Leslie Joan Scott · Leslie Joan King | 7887 N Cedar Ave, Fresno, CA 93720-2685 | Nurse Practitioner | 2014-03-24 |
| Joan Ann Holdsworth · Joan Ann Campbell | 78 Middleville Road, 118, Northport, NY 11768 | Registered Nurse | 2006-09-23 |
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This dataset includes over five million health care providers who are assigned National Provider Identifier (NPI) in the National Plan and Provider Enumeration System (NPPES), developed by the Centers for Medicare & Medicaid Services (CMS). Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under Health Insurance Portability and Accountability Act (HIPAA). Each provider is registered with the NPI, full name, status, address, taxonomy, other identifiers, etc.
| Subject | Transparency and Disclosure |
| Jurisdiction | Federal |
| Data Provider | National Plan and Provider Enumeration System (NPPES), by the Centers for Medicare & Medicaid Services (CMS) |
| Source | download.cms.gov |
The National Provider Identifier (NPI) is a Health Insurance Portability and Accountability Act (HIPAA) Administrative Simplification Standard. The NPI is a unique identification number for covered health care providers and all health plans and health care clearinghouses, who must use the NPIs in the administrative and financial transactions adopted under HIPAA. The NPI is a 10-position, intelligence-free numeric identifier (10-digit number). All health care providers who are HIPAA-covered entities, whether individuals or organizations, must get an NPI. A HIPAA-covered entity is a health care provider that conducts certain transactions in electronic form, or a health care clearinghouse, or a health plan (including commercial plans, Medicare, and Medicaid). Centers for Medicare & Medicaid Services (CMS) has developed the National Plan and Provider Enumeration System (NPPES) to assign unique identifiers to health care providers. The National Provider Indentifier (NPI) has been the standard identifier for all HIPAA-covered entities (health care providers) since May 23, 2007. Small health plans were required to obtain and use an NPI by May 23, 2008. This dataset includes over five million health care providers (individuals and organizations) who are assigned NPI. The provider data elements are disclosed to the public by the Centers for Medicare & Medicaid Services (CMS) under the Freedom of Information Act (FOIA), as listed in the NPPES Data Dissemination Notice (CMS-6060-N). The NPI final rules define the following elements which required to be disclosed as determined by Department of Health & Human Services (HHS): NPI, Entity Type, Provider Name, Credential, Business Mailing Address, Business Location Address, Healthcare Provider Taxonomy Code, Other Provider Identifier, Provider Enumeration Date, NPI Deactivation Date, Provider License Number, Authorized Official Name and Contact Information. |