Gillian Alison Southwell, M.D.
Internal Medicine Physician · Washington, DC
Gillian Alison Southwell, M.D. is an internal medicine physician with a practice address in Washington, District of Columbia, and NPI 1396899399, issued on Jan 23, 2007. Check the license (District of Columbia MD31790, as entered in NPPES) on the District of Columbia Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Gillian Alison Southwell
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- MD31790 DC
D55636 MD
Self-reported in NPPES; status is on the state search - Practice location
- 110 Irving Street, Washington, DC 20010
- Phone
- (202) 877-5975
- Enumerated
- Jan 23, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (202) 877-2718
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 901 in District of Columbia → Look up another NPI →
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A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gillian Alison Southwell in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersDistrict of Columbia Board of Medicine
Search for license MD31790Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 80.2 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Gillian Alison Southwell among 901 internal medicine physician records in District of Columbia
Gillian Alison Southwell, M.D. is one of 901 internal medicine physician records with a practice address in District of Columbia. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 33% of them.
- NPI issued2007 · 33% of these records are older, 55% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 57% of these records are
- Record last updated2007 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a District of Columbia practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
891 internal medicine physician records list a practice address in Washington
They are 891 of the 45,857 NPPES records with a practice address in Washington, and 901 internal medicine physician records in District of Columbia.
All 901 in District of Columbia → Every provider in Washington → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Jessica Fields, MDWashington, DC 200101417903162
- Gerard Harris, M.D.Washington, DC 200101679542724
- Shameem Huq, MDWashington, DC 200101275587784
- Francisco King, M.D.Washington, DC 200101568430064
Common questions
What is Gillian Alison Southwell, M.D.'s NPI number?
Gillian Alison Southwell, M.D.'s National Provider Identifier (NPI) is 1396899399, issued on Jan 23, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Gillian Alison Southwell, M.D. located?
The NPPES record lists a practice address at 110 Irving Street, Washington, DC, 20010. Phone: (202) 877-5975. Providers update this record themselves, so call before visiting.
How can I verify Gillian Alison Southwell, M.D.'s license?
NPPES lists District of Columbia license number MD31790, as entered by the provider. Search the District of Columbia Board of Medicine at https://dchealth.dc.gov/bomed. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
What is Gillian Alison Southwell, M.D.'s MIPS final score?
The 2023 MIPS final score is 80.2 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.