Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Karen H. Hallmark, M.D.

Obstetrics & Gynecology Physician in Mt Pleasant, SC · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1982617650

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Registry record

Entity type Individual (Type 1)

Name Dr. Karen H. Hallmark

Credential M.D.

Sex Female

Practice address 3510 N Highway 17 Ste 225, Mt Pleasant, SC, 29466

Phone (843) 884-0301

Fax (843) 606-8036

Enumeration date Aug 14, 2006

Last updated in NPPES Oct 29, 2020

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 20832 (SC) Secondary

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License 20832 (SC) 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
748981	Medicaid	SC	-
P00886825	Other	SC	RAILROAD MC ID-RSFPN

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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Karen Hallmark?

Karen Hallmark is registered in NPPES with the primary taxonomy of Obstetrics & Gynecology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

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Susanne Bradford Obstetrics & Gynecology Physician · Mt Pleasant, SC NPI 1831102417 Phyllis Rogerson Obstetrics & Gynecology Physician · Mt Pleasant, SC NPI 1215940978 Roper Saint Francis Physicians Network Hematology & Oncology Physician · Mount Pleasant, SC NPI 1972864619 Roper Saint Francis Physicians Network Obstetrics & Gynecology Physician · Mt Pleasant, SC NPI 1972980589 Audrey White Surgical Physician Assistant · Mount Pleasant, SC NPI 1245777044 Roper Saint Francis Physicians Network Plastic and Reconstructive Surgery Physician · Mt Pleasant, SC NPI 1053149104

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-10-29.