Mark Mendel Sklar, M.D.

Primary specialty

Endocrinology, Diabetes & Metabolism PhysicianTaxonomy code 207RE0101X

License

MD18512 Issued in DC

Practice address

3 Washington Cir NW
Ste 303
Washington, DC 20037-2311

Phone

(202) 887-4769

Fax

(202) 223-2552

NPI assigned

Jun 20, 2005

Sex

Male

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Opted out of Medicare

Yes, effective Apr 1, 2025 through Apr 1, 2027

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

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.

• Frederick Health Hospital Inc

  • General Acute Care Hospital
  • Frederick, MD
  • NPI 1538165527
  NPD (past)

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

{
    "created_epoch": "1119225600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1720083223",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "8101 FALSTAFF RD",
            "city": "MC LEAN",
            "state": "VA",
            "postal_code": "221022730",
            "telephone_number": "703-893-0962",
            "fax_number": "202-223-2552"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "3 WASHINGTON CIR NW",
            "address_2": "STE 303",
            "city": "WASHINGTON",
            "state": "DC",
            "postal_code": "200372311",
            "telephone_number": "202-887-4769",
            "fax_number": "202-223-2552"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SKLAR",
        "first_name": "MARK",
        "middle_name": "MENDEL",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-06-20",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RE0101X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Endocrinology, Diabetes & Metabolism",
            "state": "DC",
            "license": "MD18512",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Marcus Skinner
• Ronita Skinner, HHA
• Sheila E Skinner, MS, CCC-SLP
• Tomika Skinner
• Dante Skipwith
• Astero Skliras, MA CCC-SLP
• Eric D Skolnick, MD
• Maria Skordili, MSPT
• Lauren Johnston Skowera, AGAC-NP
• Mackenzie James Skrba, HS

• Endocrinology, Diabetes & Metabolism Physician in Washington, DC
• Providers in Washington, DC by specialty
• Endocrinology, Diabetes & Metabolism Physician in District of Columbia

• 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.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring; Opt Out Affidavits.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.