NPIMap

Individual provider Active NPI

Allen Jay Blaivas, DO

  • Internal Medicine Physician
  • New York, NY
National Provider Identifier
1104830397
Registry record updated Jan 9, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Internal Medicine PhysicianTaxonomy code 207R00000X
License
236102 Issued in NY
Practice address
1111 Amsterdam Ave
New York, NY 10025-1716
Phone
(212) 523-4000
NPI assigned
Jul 27, 2006
Sex
Male
Sole proprietor
No

Organizations & group practices 15

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.

View all 15

Hospital & facility affiliations 6

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

Care Compare profile

Medicare Care Compare
Specialty
Internal MedicineAlso: Pulmonary Disease, Sleep Medicine
Education
New York College of Osteo Medicine of New York Institute of Technology, 1999
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Progressive Care Medical Group PLLC 45 clinicians
Hackensack Meridian Health Medical Group - Specialty Care PC 1,901 clinicians

Practice addresses (Care Compare)

150 Riverside Dr
New York, NY 10024-2298
Phone (646) 505-3500

30 Prospect Ave
Hackensack, NJ 07601-1915
Phone (551) 996-5045

Hospital & facility affiliations

  • Revival Home Health Care Home health agency, Staten Island, NY, CCN 337299
  • Girling Health Care of New York Home health agency, Brooklyn, NY, CCN 337243
  • Hackensack University Medical Center Hospital, Hackensack, NJ, CCN 310001
  • Community Medical Center Hospital, Toms River, NJ, CCN 310041
  • The Riverside Nursing home, New York, NY, CCN 335334

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in NJ, NY2 enrollments
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 2

Enrollment IDStateProvider typePAC IDDetails
I20110202000348 NJ Practitioner - Pulmonary DiseasePractitioner - Internal MedicinePractitioner - Critical Care (Intensivists)Practitioner - Other (Physician) 9234319666 Reassigns benefits to 2 organizations
I20110920000833 NY Practitioner - Internal MedicinePractitioner - Pulmonary DiseasePractitioner - Critical Care (Intensivists)Practitioner - Sleep Medicine 9234319666 Reassigns benefits to 3 organizations

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Osteopathy

State licenses

LicenseStateTypeSpecialty
236102NYMDCritical Care Medicine (Internal Medicine) Physician

Practice roles (10 of 14)

OrganizationSpecialtyStatusNew patients
Icahn School of Medicine at Mount Sinai Current Accepting new patients
Icahn School of Medicine at Mount Sinai CurrentSince Jun 4, 2022 Accepting new patients
Progressive Care Medical Group, PLLC Internal Medicine CurrentSince Sep 19, 2025 Accepting new patients
Hackensack Meridian Health Medical Group - Specialty Care PC CurrentSince Jan 1, 2020 Accepting new patients
Icahn School of Medicine at Mount Sinai Current Accepting new patients
Icahn School of Medicine at Mount Sinai Critical Care Medicine CurrentSince Jun 4, 2022 Accepting new patients
Icahn School of Medicine at Mount Sinai Critical Care Medicine CurrentSince Feb 1, 2023 Accepting new patients
Hackensack Meridian Health Medical Group - Specialty Care PC Internal Medicine CurrentSince Jan 1, 2020 Accepting new patients
Nydh Physician Practice Internal Medicine Past Accepting new patients
150 Riverside Op. LLC Past Accepting new patients

Locations

30 Prospect Ave
Hackensack, NJ 07601
Phone (201) 488-0066

200 Old Country Rd
Mineola, NY 11501
Phone (516) 408-4900

1111 Amsterdam Ave
New York, NY 10025
Phone (212) 523-2309

1000 10th Ave
New York, NY 10019
Phone (212) 523-2369

150 Eileen Way
Unit 1
Syosset, NY 11791
Phone (516) 855-5255

Networks

  • Healthfirst Medicare Network H1722
  • Healthfirst Medicare Network H9678
  • Healthfirst Medicare Network H3359
  • Healthfirst Medicare Network H5989

Interoperability endpoints

  • Direct secure messaging: allen.blaivas@direct.hackensackmeridian.org
  • FHIR API: https://fhir4.healow.com/fhir/r4/IHJHBD

NPPES NPI Registry

Updated by the provider on Jan 9, 2026

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

Specialties & licenses 3

Specialty (taxonomy)CodeLicenseStatePrimary
Critical Care Medicine (Internal Medicine) Physician 207RC0200X 236102 NY
Internal Medicine Physician 207R00000X 236102 NY Primary
Pulmonary Disease Physician 207RP1001X 236102 NY

Addresses

Primary practice location

1111 Amsterdam Ave
New York, NY 10025-1716

Mailing address

44 Barry PL
Passaic, NJ 07055-3516

Other practice location 1

385 Tremont Ave # 561/111
East Orange, NJ 07018-1023
Phone (973) 676-1000 ext. 1220

Other practice location 2

1000 10th Ave
New York, NY 10019-1147
Phone (212) 523-4000

NPI Registry JSON

The complete NPPES record for this NPI in the NPI Registry API format, last updated by the provider on Jan 9, 2026.

{
    "created_epoch": "1153958400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1767916800000",
    "number": "1104830397",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "44 BARRY PL",
            "city": "PASSAIC",
            "state": "NJ",
            "postal_code": "070553516",
            "fax_number": "973-395-7034"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1111 AMSTERDAM AVE",
            "city": "NEW YORK",
            "state": "NY",
            "postal_code": "100251716",
            "telephone_number": "212-523-4000"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "385 Tremont Ave # 561/111",
            "address_purpose": "LOCATION",
            "city": "East Orange",
            "state": "NJ",
            "postal_code": "070181023",
            "country_code": "US",
            "telephone_number": "973-676-1000 x1220",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "1000 10th Ave",
            "address_purpose": "LOCATION",
            "city": "New York",
            "state": "NY",
            "postal_code": "100191147",
            "country_code": "US",
            "telephone_number": "212-523-4000",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "BLAIVAS",
        "first_name": "ALLEN",
        "middle_name": "JAY",
        "name_prefix": "Dr.",
        "credential": "DO",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-07-27",
        "last_updated": "2026-01-09",
        "certification_date": "2026-01-09",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RC0200X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Critical Care Medicine",
            "state": "NY",
            "license": "236102",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "NY",
            "license": "236102",
            "primary": true
        },
        {
            "code": "207RP1001X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Pulmonary Disease",
            "state": "NY",
            "license": "236102",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in New York, NY

Sources for this page

Verify at the official NPI Registry.