Omar K Mahmassani, D.D.S.

Primary specialty

DentistTaxonomy code 122300000X

License

10913 Issued in MD

Practice address

5910 Frederick Crossing LN Ste 101
Frederick, MD 21704-5141

Phone

(301) 662-4422

Fax

(301) 965-8360

NPI assigned

Jun 25, 2006

Last updated

May 12, 2026By the provider in NPPES

Sex

Male

Sole proprietor

Yes

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

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Enrolled in MD2 enrollments

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: No
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 2

Specialty

Dentist

Education

Georgetown University School of Medicine, 1989

Medicare assignment

May accept Medicare assignment

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Practice roles

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.

• Irene C. Shin DDS LLC

  dba Avenwell Dental

  • General Practice Dentistry
  • Frederick, MD
  • NPI 1609770817
  NPD (past)

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

{
    "created_epoch": "1151193600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1778544000000",
    "number": "1497781850",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "5910 FREDERICK CROSSING LN",
            "address_2": "SUITE 101",
            "city": "FREDERICK",
            "state": "MD",
            "postal_code": "217045112",
            "telephone_number": "301-662-4422",
            "fax_number": "301-965-8360"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "5910 FREDERICK CROSSING LN STE 101",
            "city": "FREDERICK",
            "state": "MD",
            "postal_code": "217045141",
            "telephone_number": "301-662-4422",
            "fax_number": "301-965-8360"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MAHMASSANI",
        "first_name": "OMAR",
        "middle_name": "K",
        "name_prefix": "Dr.",
        "credential": "D.D.S.",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2006-06-25",
        "last_updated": "2026-05-12",
        "certification_date": "2026-05-12",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "332BC3200X",
            "taxonomy_group": "",
            "desc": "Durable Medical Equipment & Medical Supplies, Customized Equipment",
            "state": "MD",
            "license": "10913",
            "primary": false
        },
        {
            "code": "122300000X",
            "taxonomy_group": "",
            "desc": "Dentist",
            "state": "MD",
            "license": "10913",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Magnolia Behavior Health Center LLC
• Magnolia Behavior Health Center LLC
• Magnolia Psychiatric Services PLLC
• Philip Jay Magpantay, DDS
• Katherine Ann Maher, M.D.
• Syed Kashif Mahmood, M.D.
• Chrissy Mahoney
• Betty Mai, PHARMD
• Main Place Addiction Treatment Center LLC.
• Main Place Treatment Centers LLC.

• Dentist in Frederick, MD
• Providers in Frederick, MD by specialty
• Dentist in Maryland

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 12, 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.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.