NPIMap

Individual provider Active NPI

Oscar Adler, M.D., PHD

  • Nephrology Physician
  • Leesburg, VA
National Provider Identifier
1700874138
Registry record updated Jun 2, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Nephrology PhysicianTaxonomy code 207RN0300X
License
0101234619 Issued in VA
Practice address
19490 Sandridge Way, Suite 120
Leesburg, VA 20176-3469
Phone
(703) 723-5555
Fax
(703) 562-6996
NPI assigned
Oct 10, 2005
Last updated
Jun 2, 2026By the provider in NPPES
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Jun 2, 2026

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Nephrology Physician 207RN0300X 0101234619 VA Primary

Addresses

Primary practice location

19490 Sandridge Way, Suite 120
Leesburg, VA 20176-3469

Mailing address

19490 Sandridge Way Ste 120
Lansdowne, VA 20176-3469
Phone (703) 723-5555

Other identifiers 2

IdentifierTypeStateIssuer
1700874138MedicaidVA
30015815110001MedicaidVA

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in DC, VA2 enrollments
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 2

Enrollment IDStateProvider typePAC IDDetails
I20080520000851 DC Practitioner - Internal MedicinePractitioner - Nephrology 8729029640 Reassigns benefits to 1 organization
I20080520000871 VA Practitioner - NephrologyPractitioner - Internal Medicine 8729029640 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Nephrology
Education
Other, 1983
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
Loudoun Medical Group, PCGroup PAC ID 0042119661, 272 clinicians

Practice addresses (Care Compare)

19490 Sandridge Way
Leesburg, VA 20176-3469

20955 Professional PLZ
Suite 200
Ashburn, VA 20147-3405
Phone (703) 729-7652

224 D Cornwall St NW
Leesburg, VA 20176-2700

44084 Riverside Pkwy
Suite 300
Leesburg, VA 20176-5102
Phone (703) 724-7530

6355 Walker LN
308 Metropolitan ENT
Alexandria, VA 22310-3247
Phone (703) 313-7700

Hospital & facility affiliations

Merit-based Incentive Payment System (MIPS)

Final score
92.65 of 100Reported as apm
Quality
85.31
Promoting interoperability
100
Improvement activities
40

National Provider Directory

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

Practice roles

OrganizationSpecialtyStatusNew patients
Loudoun Medical Group, PC CurrentSince Sep 15, 2012 Accepting new patients
Physicians Practice and Research, LLC Nephrology CurrentSince Oct 1, 2007 Accepting new patients
Loudoun Medical Group, PC CurrentSince Sep 15, 2012 Accepting new patients
Loudoun Medical Group, PC Current Accepting new patients
Pure Life Renal of Lansdowne, LLC PastSince May 11, 2017 Accepting new patients
Frederick Health Hospital Inc Past Accepting new patients

Locations

6355 Walker Ln
Ste 308
Alexandria, VA 22310
Phone (703) 313-7700

20955 Professional Plz
Ste 200
Ashburn, VA 20147
Phone (703) 729-7652

19415 Deerfield Ave
Ste 107
Leesburg, VA 20176
Phone (703) 723-5555

224D Cornwall St NW
Ste 403
Leesburg, VA 20176
Phone (703) 737-6001

19490 Sandridge Way
Ste 120
Leesburg, VA 20176
Phone (571) 293-1087

44055 Riverside Pkwy
#20811302
Leesburg, VA 20176
Phone (703) 729-7652

1800 Town Center Dr
Ste 218
Reston, VA 20190
Phone (703) 437-1160

1850 Town Center Pkwy
Reston, VA 20190
Phone (703) 478-0922

Interoperability endpoints

  • FHIR API: https://fhir4.healow.com/fhir/r4/AJDIDD
  • FHIR API: https://fhir4.healow.com/fhir/r4/AJDIDD/Endpoint/AJDIDD

Organizations & group practices 6

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

Hospital & facility affiliations 8

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": "1128902400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1780358400000",
    "number": "1700874138",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "19490 SANDRIDGE WAY STE 120",
            "city": "LANSDOWNE",
            "state": "VA",
            "postal_code": "201763469",
            "telephone_number": "703-723-5555",
            "fax_number": "703-858-1251"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "19490 SANDRIDGE WAY, SUITE 120",
            "city": "LEESBURG",
            "state": "VA",
            "postal_code": "201763469",
            "telephone_number": "703-723-5555",
            "fax_number": "703-562-6996"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "ADLER",
        "first_name": "OSCAR",
        "credential": "M.D., PHD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-10-10",
        "last_updated": "2026-06-02",
        "certification_date": "2026-06-02",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RN0300X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Nephrology",
            "state": "VA",
            "license": "0101234619",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "1700874138",
            "state": "VA"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "30015815110001",
            "state": "VA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Leesburg, VA

Sources for this page

Verify at the official NPI Registry.