Mark Chrostowski, M.D.

Primary specialty

Anesthesiology PhysicianTaxonomy code 207L00000X

License

228369 Issued in MA

Practice address

55 Fruit Street, Clinic 3
Massachusetts General
Boston, MA 02114

Phone

(617) 524-1939

NPI assigned

May 26, 2006

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

Enrolled in CT

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.

Enrollment records 1

Specialty

Anesthesiology

Education

JS Weill Medical College, Cornell University, 2004

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Greenwich Anesthesiology Associates PCGroup PAC ID 2163315425, 44 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Greenwich Hospital Association - Hospital, Greenwich, CT, CCN 070018

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Interoperability endpoints

• Direct secure messaging: mchrostowski5702@direct.ynhh.org

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.

• Greenwich Anesthesiology Associates, PC

  • Anesthesiology Physician
  • Greenwich, CT
  • NPI 1972557486
  Medicare reassignment Care Compare group

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

• Greenwich Hospital

  • General Acute Care Hospital
  • Greenwich, CT
  • NPI 1609846088
  Care Compare affiliation

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

{
    "created_epoch": "1148601600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1558317040",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "50 LILA RD",
            "city": "JAMAICA PLAIN",
            "state": "MA",
            "postal_code": "021303448",
            "telephone_number": "617-524-1939"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "55 FRUIT STREET, CLINIC 3",
            "address_2": "MASSACHUSETTS GENERAL",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "02114",
            "telephone_number": "617-524-1939"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "CHROSTOWSKI",
        "first_name": "MARK",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-05-26",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207L00000X",
            "taxonomy_group": "",
            "desc": "Anesthesiology",
            "state": "MA",
            "license": "228369",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Brooks H Christopher
• Kenneth Bruce Christopher, MD
• Jessica Mary Christopulos, LCSW
• Helen A Christou, MD
• Jacqueline Chrones, PHARMD
• Pericles J Chrysoheris, M.D.
• Alexander L. Chu
• Caitlyn Chu
• Christopher H Chu, MD
• David Chu, MD

• Anesthesiology Physician in Boston, MA
• Providers in Boston, MA by specialty
• Anesthesiology 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.
• 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.