Christopher Thomas Breen, MD

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

25MA13120900 Issued in NJ

Practice address

1275 York Ave
New York, NY 10065-6007

Phone

(646) 227-3378

NPI assigned

May 21, 2021

Sex

Male

Sole proprietor

No

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

Specialties & licenses 3

Addresses

Medicare fee-for-service enrollment

Enrolled in CA

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

HospitalistAlso: Internal Medicine

Education

Yale University School of Medicine, 2021

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Regents of the University of CaliforniaGroup PAC ID 4284547274, 706 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• UCSF Medical Center Hospital, San Francisco, CA, CCN 050454
• UCSF Health St. Mary'S Hospital Hospital, San Francisco, CA, CCN 050457

Merit-based Incentive Payment System (MIPS)

Final score

100 of 100Reported as group

Quality

95

Improvement activities

40

Cost

80.65

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: cbreen359617@direct-ucsfmedicalcenter.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.

• Regents of the University of California

  • Internal Medicine Physician
  • San Francisco, CA
  • NPI 1760552343
  Medicare reassignment Care Compare group NPD
• UCSF Medical Group Business Services

  • Internal Medicine Physician
  • San Francisco, CA
  • NPI 1477624104
  Medicare reassignment NPD
• University of California San Francisco

  • Pediatrics Physician
  • San Francisco, CA
  • NPI 1861578973
  Medicare reassignment NPD
• UCSF Medical Group Business Services

  • Health Service Clinic/Center
  • San Francisco, CA
  • NPI 1194115246
  NPD
• University of California San Francisco

  • Surgery Physician
  • San Francisco, CA
  • NPI 1346329380
  NPD
• University of California San Francisco

  • Community/Retail Pharmacy
  • San Francisco, CA
  • NPI 1659141711
  NPD
• Regents of the University of California

  • Rheumatology Physician
  • San Francisco, CA
  • NPI 1881763597
  NPD (past)

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

• UCSF Health Community Hospitals

  • General Acute Care Hospital
  • San Francisco, CA
  • NPI 1174667158
  Care Compare affiliation
• University of California, San Francisco

  • General Acute Care Hospital
  • San Francisco, CA
  • NPI 1689772592
  Care Compare affiliation

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

{
    "created_epoch": "1621555200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1781568000000",
    "number": "1093380016",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1275 YORK AVE",
            "city": "NEW YORK",
            "state": "NY",
            "postal_code": "100656007"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1275 YORK AVE",
            "city": "NEW YORK",
            "state": "NY",
            "postal_code": "100656007",
            "telephone_number": "646-227-3378"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "BREEN",
        "first_name": "CHRISTOPHER",
        "middle_name": "THOMAS",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2021-05-21",
        "last_updated": "2026-06-16",
        "certification_date": "2026-06-16",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "NY",
            "license": "344894",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "A196272",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "NJ",
            "license": "25MA13120900",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Alyssa Bree
• Sabrina Breed, PH.D.
• Lindsay Breeding, LMSW
• Bridget Mary Breen, MSW
• Carly Breen, DO
• Jason Breen
• Matthew Scott Breen, MD
• Samantha Lynn Breen, LMSW
• Sarah Elizabeth Breen, LMSW
• Tracy L Breen, MD

• Internal Medicine Physician in New York, NY
• Providers in New York, NY by specialty
• Internal Medicine Physician in New York

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 16, 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.