Carl W Nissen, MD

Primary specialty

Orthopaedic Surgery PhysicianTaxonomy code 207X00000X

License

033613 Issued in CT

Practice address

31 Seymour St Ste 204
Hartford, CT 06106-5505

Phone

(860) 421-3233

NPI assigned

Jun 28, 2005

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 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

Sports MedicineAlso: Orthopedic Surgery

Education

University of Connecticut School of Medicine, 1990

Medicare assignment

May accept Medicare assignment

Group practices

Hartford HospitalGroup PAC ID 2567366016, shared by 6 NPIs, 1,040 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Hartford Hospital Hospital, Hartford, CT, CCN 070025

Merit-based Incentive Payment System (MIPS)

Final score

92.63 of 100Reported as group

Quality

75.35

Promoting interoperability

100

Improvement activities

40

Cost

71.44

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: cnissen7432@connecticutchildrens.direct-ci.com

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.

• Prism Sports Medicine, LLC

  • Orthopaedic Surgery Physician
  • Hartford, CT
  • NPI 1851920029
  Medicare reassignment NPD Authorized official
• Hartford Hospital

  • Surgery Physician
  • Hartford, CT
  • NPI 1407806391

  Orthopaedic Surgery

  Medicare reassignment NPD
• Hartford Hospital

  • General Acute Care Hospital
  • Hartford, CT
  • NPI 1770696643
  Medicare reassignment NPD
• Connecticut Children'S Specialty Group, Inc.

  • Ophthalmology Physician
  • Glastonbury, CT
  • NPI 1568056984

  Orthopaedic Surgery

  NPD
• Connecticut Children'S Specialty Group, Inc.

  • Pediatrics Physician
  • Hartford, CT
  • NPI 1669448882

  Orthopaedic Surgery

  NPD
• Hartford Pathology Associates, P.C.

  • Anatomic Pathology & Clinical Pathology Physician
  • Hartford, CT
  • NPI 1063464477
  NPD

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

• Hartford Hospital

  • General Acute Care Hospital
  • Hartford, CT
  • NPI 1770696643
  Care Compare affiliation
• Hartford Hospital

  • General Acute Care Hospital
  • Hartford, CT
  • NPI 1902834880
  Care Compare affiliation

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

{
    "created_epoch": "1119916800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1763510400000",
    "number": "1982601530",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "31 PINNACLE RIDGE RD",
            "city": "FARMINGTON",
            "state": "CT",
            "postal_code": "060323041",
            "telephone_number": "860-421-3233"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "31 SEYMOUR ST STE 204",
            "city": "HARTFORD",
            "state": "CT",
            "postal_code": "061065505",
            "telephone_number": "860-421-3233"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "NISSEN",
        "first_name": "CARL",
        "middle_name": "W",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-06-28",
        "last_updated": "2025-11-19",
        "certification_date": "2025-11-19",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207XP3100X",
            "taxonomy_group": "",
            "desc": "Orthopaedic Surgery, Pediatric Orthopaedic Surgery",
            "state": "CT",
            "license": "033613",
            "primary": false
        },
        {
            "code": "207X00000X",
            "taxonomy_group": "",
            "desc": "Orthopaedic Surgery",
            "state": "CT",
            "license": "033613",
            "primary": true
        },
        {
            "code": "207XX0005X",
            "taxonomy_group": "",
            "desc": "Orthopaedic Surgery, Sports Medicine",
            "state": "CT",
            "license": "33613",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Ishaira Nieto Rosas, MD
• Alicia G. Nieto, LICSW
• Christina Nieves
• Isabel Nip
• Sushant Niroula, MD
• Deogratias Niyonkuru, MSW
• Gayle Suzanne Nobert-Brill, RN
• Gary Francis Nobert, M.D.
• Claudette Noble
• Donald Lee Nodine, D.C.

• Orthopaedic Surgery Physician in Hartford, CT
• Providers in Hartford, CT by specialty
• Orthopaedic Surgery Physician in Connecticut

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Nov 19, 2025; 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.