1. Home
  2. Directory
  3. District Of Columbia
  4. Washington
  5. Internal Medicine
  6. NPI Profile

DR. GILLIAN ALISON SOUTHWELL M.D.
NPI 1396899399
Internal Medicine in Washington, DC

Active since January 23, 2007PECOS Enrolled
80.17/100
CMS Quality Rating
110 IRVING STREET, SUITE 4B1, WASHINGTON, DC 20010(202) 877-5975(202) 877-2718 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Dr. Gillian Alison Southwell M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. GILLIAN ALISON SOUTHWELL M.D. (NPI 1396899399) is an individual internal medicine provider in Washington, District Of Columbia, licensed in District Of Columbia (MD31790) and active in the NPI registry since January 2007. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1396899399
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameDR. GILLIAN ALISON SOUTHWELLCredential: M.D.
Location Address110 IRVING STREET, SUITE 4B1Washington, DC 20010
Mailing Address2101 East Jefferson Street, Kaiser Permanente Ppqa 6 WestRockville, MD 20852 · (301) 816-6660 · Fax (301) 816-6308
Phone(202) 877-5975
Fax(202) 877-2718
Sole ProprietorNo
Enumeration DateJanuary 23, 2007
Last NPPES UpdateJuly 8, 2007
✔ NPI 1396899399 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Licenses✔ Licensed in DC · MD31790✔ Licensed in MD · D55636
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
110 IRVING STREET, Washington, DC 20010
Open in Google Maps ↗

Other Identifiers 2

Medicare UPINH94450
Medicare ID-Type UnspecifiedK679G947

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Gillian Alison Southwell M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
26 services15 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 20010 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$147.85 typical visit price
range $65.18 – $194.86
Typical copayment $36.96 (range $16.29 – $48.71)
Most-billed visit code 99204
Established Patient
$113.72 typical visit price
range $21.40 – $158.88
Typical copayment $28.43 (range $5.35 – $39.72)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

80.17/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality76.69
Promoting Interoperability100
Improvement Activities40
Cost53.49

Other Providers at the Same Location NPPES 7

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MR. DIEGO MORENO WATASHI M.D.
Student in an Organized Health Care Education/Training Program
110 IRVING STREET
WASHINGTON, DC 20010
District of Columbia (202) 877-7000
DR. TONI L TURNER M.D.
Internal Medicine
110 IRVING STREET
WASHINGTON, DC 20010
District of Columbia (202) 877-2444
DR. SYEDA B. MOOSVI MD
Internal Medicine
110 IRVING STREET, 1 A50
WASHINGTON, DC 20010
District of Columbia (202) 877-2835
DR. CECILIA MELISSA HAMMOND M.D.
Internal Medicine
110 IRVING STREET, SUITE 4B1
WASHINGTON, DC 20010
District of Columbia (202) 877-5975
DR. YUNG-SOO PANG M.D.
Internal Medicine
110 IRVING STREET, SUITE 4B1
WASHINGTON, DC 20010
District of Columbia (202) 877-5975
DR. CARMITA ANTIONETTE GOBERN M.D.
Internal Medicine
110 IRVING STREET, ROOM GB10
WASHINGTON, DC 20010
District of Columbia (202) 877-2444
DR. KEVIN WYETTE BRATHWAITE M.D.
Internal Medicine
110 IRVING STREET, SUITE 4B1
WASHINGTON, DC 20010
District of Columbia (202) 877-5975

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Gillian Southwell's NPI number?

The NPI number for Gillian Southwell is 1396899399. It was assigned to this individual provider in the NPPES registry on January 23, 2007.

Where is Gillian Southwell located?

Gillian Southwell practices at 110 Irving Street Suite 4b1, Washington, DC 20010. The listed phone number is (202) 877-5975.

What is Gillian Southwell's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Gillian Southwell enrolled in Medicare?

Yes. Gillian Southwell is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Gillian Southwell was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.