Miriam Lilla Ornstein, M.D.

Primary specialty

Psychiatry PhysicianTaxonomy code 2084P0800X

License

73547 Issued in MA

Practice address

6 Bigelow St
Suite #101
Cambridge, MA 02139-2384

Phone

(617) 441-8750

NPI assigned

May 28, 2006

Sex

Female

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 Jun 25, 2021 through Jun 25, 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.

• The Commonwealth of Massachusetts

  • Mental Health Clinic/Center (Including Community Mental Health Center)
  • Brockton, MA
  • NPI 1326155458
  NPD (past)

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

{
    "created_epoch": "1148774400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1104873892",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "53 DARTMOUTH ST",
            "city": "BELMONT",
            "state": "MA",
            "postal_code": "024783643",
            "telephone_number": "617-441-8750"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "6 BIGELOW ST",
            "address_2": "SUITE #101",
            "city": "CAMBRIDGE",
            "state": "MA",
            "postal_code": "021392384",
            "telephone_number": "617-441-8750"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "ORNSTEIN",
        "first_name": "MIRIAM LILLA",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2006-05-28",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2084P0800X",
            "taxonomy_group": "",
            "desc": "Psychiatry & Neurology, Psychiatry",
            "state": "MA",
            "license": "73547",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Orange Door Collaborative, PLLC
• Christie Lee Orcutt
• Maria Alexandra Ordonez, MD
• John Orellana
• Alan Jeffrey Ornstein, LCSW
• Claudia Elizabeth Orozco
• Megan Orr, LICSW
• David Luis Ortega, PSY.D.
• Elizabeth A Orth, ND
• Orthodontics of Cambridge, PC

• Psychiatry Physician in Cambridge, MA
• Providers in Cambridge, MA by specialty
• Psychiatry Physician in Massachusetts

• 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.