Active NPI
Barbara Christine Williamson, M.D.
- Dermatology Physician
- Largo, MD
National Provider Identifier
1972596690
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Dermatology Physician
- License
- D0031566
- Practice address
- 1400 Mercantile LN
Ste#110
Largo, MD 20774-5341 - Phone
- (301) 772-9775
- Fax
- (301) 772-8395
- NPI assigned
- Aug 28, 2005
- Sex
- Female
- Sole proprietor
- No
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Specialties & licenses 1
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Dermatology Physician | 207N00000X | D0031566 | MD | Primary |
Addresses
Primary practice location
1400 Mercantile LN
Ste#110
Largo, MD 20774-5341
Mailing address
PO Box 493
Greenbelt, MD 20768-0493
Other identifiers 4
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 348025 | Other | MD | UNITEDHEALTHCARE/MAMSI |
| 560789 | Other | MD | AETNA |
| 9601-0001 | Other | MD | CAREFIRSTD.C. |
| 6732BC | Other | MD | CAREFIRST MARYLAND |
Other names 1
- Mrs. Barbara Williamson Henry
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Not listed in the public Medicare enrollment file
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
- Credentials
- Doctor of Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| D0031566 | MD | MD | Dermatology Physician |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1125187200000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1783900800000",
"number": "1972596690",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "PO BOX 493",
"city": "GREENBELT",
"state": "MD",
"postal_code": "207680493"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "1400 MERCANTILE LN",
"address_2": "STE#110",
"city": "LARGO",
"state": "MD",
"postal_code": "207745341",
"telephone_number": "301-772-9775",
"fax_number": "301-772-8395"
}
],
"practiceLocations": [],
"basic": {
"last_name": "WILLIAMSON",
"first_name": "BARBARA",
"middle_name": "CHRISTINE",
"name_prefix": "Dr.",
"credential": "M.D.",
"sole_proprietor": "NO",
"sex": "F",
"enumeration_date": "2005-08-28",
"last_updated": "2026-07-13",
"status": "A"
},
"taxonomies": [
{
"code": "207N00000X",
"taxonomy_group": "",
"desc": "Dermatology",
"state": "MD",
"license": "D0031566",
"primary": true
}
],
"identifiers": [
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "UNITEDHEALTHCARE/MAMSI",
"identifier": "348025",
"state": "MD"
},
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "AETNA",
"identifier": "560789",
"state": "MD"
},
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "CAREFIRSTD.C.",
"identifier": "9601-0001",
"state": "MD"
},
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "CAREFIRST MARYLAND",
"identifier": "6732BC",
"state": "MD"
}
],
"endpoints": [],
"other_names": [
{
"first_name": "BARBARA",
"last_name": "HENRY",
"middle_name": "WILLIAMSON",
"prefix": "MRS.",
"code": "5",
"type": "Other Name"
}
]
}Other providers in Largo, MD
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.