Dr Gillian Alison Southwell, MD - Medicare Internal Medicine in Washington, DC

Dr Gillian Alison Southwell, MD is a medicare enrolled "Internal Medicine" physician in Washington, District Of Columbia. She went to Howard University College Of Medicine and graduated in 1996 and has 28 years of diverse experience with area of expertise as Internal Medicine. She is a member of the group practice Medstar Medical Group Ii Llc and her current practice location is 110 Irving Street, Suite 4b1, Washington, District Of Columbia. You can reach out to her office (for appointments etc.) via phone at (202) 877-5975.

Dr Gillian Alison Southwell is licensed to practice in District Of Columbia (license number MD31790) and she also participates in the medicare program. She accepts medicare assignments (which means she accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and her NPI Number is 1396899399.

Contact Information

Dr Gillian Alison Southwell, MD
110 Irving Street, Suite 4b1,
Washington, DC 20010
(202) 877-5975
(202) 877-2718

Map and Direction




Physician's Profile

Full NameDr Gillian Alison Southwell
GenderFemale
SpecialityInternal Medicine
Experience28 Years
Location110 Irving Street, Washington, District Of Columbia
Accepts Medicare AssignmentsYes. She accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Dr Gillian Alison Southwell attended and graduated from Howard University College Of Medicine in 1996
  NPI Data:
  • NPI Number: 1396899399
  • Provider Enumeration Date: 01/23/2007
  • Last Update Date: 07/08/2007
  Medicare PECOS Information:
  • PECOS PAC ID: 9032294723
  • Enrollment ID: I20080305000201

Medical Identifiers

Medical identifiers for Dr Gillian Alison Southwell such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1396899399NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine MD31790 (District Of Columbia)Primary
207R00000XInternal Medicine D55636 (Maryland)Secondary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Medstar Washington Hospital CenterWashington, DCHospital

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 Gillian Alison Southwell allows following entities to bill medicare on her behalf.
Entity NameWhc Physician Group Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1700154226
PECOS PAC ID: 6103093513
Enrollment ID: O20120125000252
Entity NameMedstar Medical Group Ii Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1184046187
PECOS PAC ID: 0547413825
Enrollment ID: O20130117000415
Entity NameMedstar Total Elder Care, Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1750752911
PECOS PAC ID: 4981901550
Enrollment ID: O20160426001351

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 Gillian Alison Southwell 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 Gillian Alison Southwell, MD
2101 East Jefferson Street, Kaiser Permanente Ppqa 6 West,
Rockville, MD 20852

Ph: (301) 816-6660
Dr Gillian Alison Southwell, MD
110 Irving Street, Suite 4b1,
Washington, DC 20010

Ph: (202) 877-5975

Reviews and Comments


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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.