Dr. Gillian Alison Southwell, MD
- Medicare services, 2024
- 26
- Medicare patients, 2024
- 17
- Part D claims, 2020
- 24
- MIPS score, 2024
- 82
- Hospital affiliations
- 1
- Practice address
- 110 Irving Street NW, Washington, DC 20010
- Practice phone
- Call (202) 877-7000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Southwell's professional email, personal email and mobile number
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Dr. Gillian Alison Southwell is an internist in Washington, District of Columbia
Dr. Southwell practices at MedStar Washington Hospital Center in Washington, District of Columbia, part of MedStar Health.
Dr. Southwell's NPI, 1396899399, was assigned on January 23, 2007. Dr. Southwell graduated from Howard University College of Medicine in 1996. Dr. Southwell holds District of Columbia license MD31790.
- NPI
- 1396899399NPI Registry (opens in a new tab)
- NPI enumeration date
- January 23, 2007
- NPI status
- Active
- Practice phone
- (202) 877-7000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 56
- Medical school graduation
- 1996
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Gillian Alison Southwell practices at MedStar Washington Hospital Center in Washington, District of Columbia
Dr. Southwell's primary practice is MedStar Washington Hospital Center, at 110 Irving Street NW, Washington, DC 20010 in The District County. The practice phone is (202) 877-7000.
- MedStar Washington Hospital Center110 Irving Street NW, Washington, DC 20010 · The District CountyPhone(202) 877-7000
Source: Dmand AI Affiliation Data
Dr. Gillian Alison Southwell is affiliated with 1 site of care and 3 medical groups
Dr. Southwell's primary practice is MedStar Washington Hospital Center in Washington, District of Columbia, part of MedStar Health. The medical group on file is MedStar Medical Group. Dmand AI also links Dr. Southwell to 2 more medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gillian Alison Southwell's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Southwell practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| MedStar Washington Hospital Center | Available with a free account |
| +2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gillian Alison Southwell is one of 660 internists in District of Columbia
Internal medicine is Dr. Southwell's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dmand AI has Dr. Southwell's licenses on file in 2 states: District of Columbia and Maryland.
Specialties and state licenses
- Internal medicine, District of ColumbiaPrimary
- Maryland license
Internists near Dr. Southwell
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Gillian Alison Southwell billed Medicare for 26 services in 2024
CMS data shows 26 Medicare services from Dr. Southwell across 1 procedure code in 2024, for 17 Medicare patients. Medicare paid $2,622 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Southwell's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1992024: 2687%
Dr. Southwell compared with the District of Columbia median for internists, 2024
- Dr. Southwell
- District of Columbia median
- Medicare services
- 26vs 35493% below
- Medicare patients
- 17vs 15389% below
- Part D claims
- 24vs 11078% below
Medians across 591 internists in District of Columbia with Dmand AI profiles that report each measure.
Dr. Southwell's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Southwell and other internists in District of Columbia.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gillian Alison Southwell treated 17 Medicare patients in 2024, average age 75
CMS counts 17 Medicare patients who saw Dr. Southwell in 2024. 75% of them have high blood pressure, and 71% have diabetes. Their average risk score is 2.41, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Southwell's median patient age at 24, with 50% women.
Chronic conditions among Dr. Southwell's Medicare patients, 2024
- High blood pressure75%
- Diabetes71%
- High cholesterol65%
Share of Medicare patients with each condition. A patient can have several.
Dr. Southwell's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 24
Patient panel by sex, all payers
- Women50%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gillian Alison Southwell wrote 24 Medicare Part D claims in 2020
In 2020, Dr. Southwell wrote 24 Medicare Part D claims. Every claim was for a generic drug. They cover 2 drugs, with $136 in total drug cost.
Dr. Southwell's most prescribed drugs by claims, 2020
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
Dr. Gillian Alison Southwell scored 82 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 82 out of 100 for Dr. Southwell for performance year 2024, reported as part of a group.
Dr. Southwell's MIPS scores, performance year 2024
- 82of 100Final score
- 67.9of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 69of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Source: Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Gillian Alison Southwell received $473 in industry payments from 2016 to 2025
CMS Open Payments shows 29 general payments to Dr. Southwell from 5 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Janssen Pharmaceuticals, Inc paid the most, $301.
General payments to Dr. Southwell by program year, 2016 to 2025
Companies that paid Dr. Southwell the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gillian Alison Southwell graduated from Howard University College of Medicine
Dr. Southwell graduated from Howard University College of Medicine in 1996.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gillian Alison Southwell's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Gillian Alison Southwell
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Gillian Alison Southwell's NPI number?
Dr. Gillian Alison Southwell's NPI number is 1396899399. It was assigned on January 23, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Gillian Alison Southwell?
Dr. Gillian Alison Southwell is an internist in Washington, District of Columbia. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Gillian Alison Southwell practice?
Dr. Southwell practices at 110 Irving Street NW, Washington, DC 20010. Dr. Southwell's primary practice is MedStar Washington Hospital Center in Washington, District of Columbia, part of MedStar Health. Dmand AI also links Dr. Southwell to 2 medical groups.
What is Dr. Gillian Alison Southwell's office phone number?
The practice phone on file for Dr. Southwell is (202) 877-7000.
What is Dr. Gillian Alison Southwell's medical license number?
Dr. Southwell holds District of Columbia license MD31790, one of the licenses on file in 2 states.
Which states has Dr. Gillian Alison Southwell been licensed in?
Dmand AI has state licenses on file for Dr. Southwell in District of Columbia and Maryland.
Which hospitals is Dr. Gillian Alison Southwell affiliated with?
Dr. Southwell practices at MedStar Washington Hospital Center in Washington, District of Columbia.
What medical group is Dr. Gillian Alison Southwell part of?
Dr. Southwell is linked to MedStar Medical Group. Dmand AI links Dr. Southwell to 2 more medical groups.
Does Dr. Gillian Alison Southwell accept Medicare?
Yes. CMS data shows Dr. Southwell billed Medicare for 26 services in 2024.
What is Dr. Gillian Alison Southwell's MIPS score?
Dr. Southwell's MIPS final score for performance year 2024 is 82 out of 100, reported as part of a group.
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How many Medicare patients does Dr. Gillian Alison Southwell see?
CMS counts 17 Medicare patients who saw Dr. Southwell in 2024, with an average age of 75.
What services does Dr. Gillian Alison Southwell bill to Medicare?
In 2024, Dr. Southwell's most billed Medicare services were hospital inpatient care (99233).
Where did Dr. Gillian Alison Southwell go to medical school?
Dr. Southwell graduated from Howard University College of Medicine in 1996.
What drugs does Dr. Gillian Alison Southwell prescribe most?
In 2020 Medicare Part D data, Dr. Southwell's most prescribed drugs by claims were Atorvastatin Calcium and Carvedilol.
Has Dr. Gillian Alison Southwell received payments from drug or device companies?
CMS Open Payments shows $473 in general payments to Dr. Southwell from 5 companies from 2016 to 2025. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. Gillian Alison Southwell been practicing?
Dr. Southwell graduated from medical school in 1996, 30 years ago.
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