Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Barbara Christine Williamson, M.D.
Dermatology Physician in Largo, MD · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1972596690
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Registry record
Entity type Individual (Type 1)
Name Dr. Barbara Christine Williamson
Credential M.D.
Sex Female
Practice address 1400 Mercantile Ln, Ste#110, Largo, MD, 20774
Phone (301) 772-9775
Fax (301) 772-8395
Enumeration date Aug 28, 2005
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
207N00000X Dermatology Physician Allopathic & Osteopathic Physicians · License D0031566 (MD) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 348025 | Other | MD | UNITEDHEALTHCARE/MAMSI |
| 560789 | Other | MD | AETNA |
| 9601-0001 | Other | MD | CAREFIRSTD.C. |
| 6732BC | Other | MD | CAREFIRST MARYLAND |
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
What is the NPI number for Barbara Williamson?
The National Provider Identifier (NPI) for Barbara Williamson is 1972596690, a Type 1 (individual) record in the CMS NPPES registry.
Where does Barbara Williamson practice?
The practice location on file with NPPES is in Largo, MD. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Belinda Boyer Clinical Social Worker · Largo, MD NPI 1013961127 Angela Russell Professional Counselor · Largo, MD NPI 1982643094 Bettye Wages Professional Counselor · Largo, MD NPI 1386660124 Consuela Robinson Clinical Social Worker · Largo, MD NPI 1275559015 Michelle Lindsay-Bailey Clinical Social Worker · Largo, MD NPI 1215958897 Ultrasound Services of America, Inc Physiological Laboratory · Largo, MD NPI 1275641417 Denise Chevalier Allergy Physician · Largo, MD NPI 1518057397 E-Generation Home Health Agency · Largo, MD NPI 1972678308
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.