NPIMap

Individual provider Active NPI

Katharine Danielle Harper, M.D.

  • Adult Reconstructive Orthopaedic Surgery Physician
  • Olney, MD
National Provider Identifier
1417399288
Registry record updated Jan 8, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Adult Reconstructive Orthopaedic Surgery PhysicianTaxonomy code 207XS0114X
License
D0102716 Issued in MD
Practice address
18101 Prince Philip Dr
Olney, MD 20832-1514
Phone
(301) 774-8958
NPI assigned
Jul 22, 2013
Sex
Female
Sole proprietor
Yes

NPPES NPI Registry

Updated by the provider on Jan 8, 2026

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Adult Reconstructive Orthopaedic Surgery PhysicianGroup: 193200000X MULTI-SPECIALTY GROUP 207XS0114X D0102716 MD Primary

Addresses

Primary practice location

18101 Prince Philip Dr
Olney, MD 20832-1514

Mailing address

18101 Prince Philip Dr
Olney, MD 20832-1514
Phone (301) 774-8958

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in DC
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20250514001623 DC Practitioner - Orthopedic Surgery 3072031020 Reassigns benefits to 2 organizations

Care Compare profile

Medicare Care Compare
Specialty
Orthopedic Surgery
Education
Other, 2013
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Medstar Medical Group II LLCGroup PAC ID 0547413825, 3,726 clinicians
Suburban/NRH Medical Rehabilitation IncGroup PAC ID 6507846771, 885 clinicians

Practice addresses (Care Compare)

1145 19TH St NW
311 MMG at 19TH Street NW
Washington, DC 20036-3735
Phone (202) 429-2401

18101 Prince Philip Dr
Olney, MD 20832-1514
Phone (301) 570-7404

18105 Prince Philip Dr
Olney, MD 20832-1514
Phone (301) 774-8962

3007 Tilden St NW
Suite 5N
Washington, DC 20008-3030

3305 N Leisure World Blvd
Medstar Health at Leisure World BLV
Silver Spring, MD 20906-1367
Phone (301) 598-1590

6410 Rockledge Dr
Suite 600
Bethesda, MD 20817-1844

Hospital & facility affiliations

  • Medstar Health Home Care Home health agency, Hyattsville, MD, CCN 217150
  • Bayada Home Health Care, Inc Home health agency, Gaithersburg, MD, CCN 217158
  • Medstar Montgomery Medical Center Hospital, Olney, MD, CCN 210018
  • Friends Nursing Home Nursing home, Sandy Spring, MD, CCN 215211

Procedures performed for Medicare patients

ProcedureNumber of procedures
Hip replacement19
Knee replacement16

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

Practice roles

OrganizationSpecialtyStatusNew patients
MGMC LLC Multi-Specialty CurrentSince Apr 1, 2025 Accepting new patients
MGMC, LLC Multi-Specialty Current Accepting new patients
Medstar Medical Group II LLC Multi-Specialty CurrentSince Aug 4, 2025 Accepting new patients
Medstar Medical Group II LLC Multi-Specialty CurrentSince Apr 1, 2025 Accepting new patients
Frederick Health Hospital Inc Past Accepting new patients
Medstar Medical Group II LLC Multi-Specialty Past Accepting new patients

Locations

50 Irving St NW
Washington, DC 20422
Phone (202) 745-8311

1145 19th St NW
Ste 311
Washington, DC 20036
Phone (202) 429-2401

3800 Reservoir Rd NW
Washington, DC 20007
Phone (202) 687-2203

18109 Prince Philip Dr
Ste 325
Olney, MD 20832
Phone (301) 774-8727

18101 Prince Philip Dr
Olney, MD 20832
Phone (301) 774-8618

3305 N Leisure World Blvd
Silver Spring, MD 20906
Phone (301) 598-1011

Organizations & group practices 27

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

View all 27

Hospital & facility affiliations 4

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

NPI Registry JSON

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1374451200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1767830400000",
    "number": "1417399288",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "18101 PRINCE PHILIP DR",
            "city": "OLNEY",
            "state": "MD",
            "postal_code": "208321514",
            "telephone_number": "301-774-8958"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "18101 PRINCE PHILIP DR",
            "city": "OLNEY",
            "state": "MD",
            "postal_code": "208321514",
            "telephone_number": "301-774-8958"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HARPER",
        "first_name": "KATHARINE",
        "middle_name": "DANIELLE",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2013-07-22",
        "last_updated": "2026-01-08",
        "certification_date": "2026-01-08",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207XS0114X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Orthopaedic Surgery, Adult Reconstructive Orthopaedic Surgery",
            "state": "MD",
            "license": "D0102716",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Olney, MD

Sources for this page

Verify at the official NPI Registry.