Shamanthy Ratnasingam, M.D

Primary specialty

Hospitalist PhysicianTaxonomy code 208M00000X

License

299495 Issued in NY

Practice address

155 Crystal Run Rd
Middletown, NY 10941-4028

Phone

(845) 703-6999

Fax

(845) 703-6297

NPI assigned

Jul 9, 2016

Last updated

Jun 21, 2026By the provider in NPPES

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

Enrolled in NY

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

Internal Medicine

Education

Other, 2016

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Central Suffolk HospitalGroup PAC ID 4981508082, 94 clinicians

Southwest Suffolk Medical PCGroup PAC ID 0244396349, 204 clinicians

Nicholas H Noyes Memorial HospitalGroup PAC ID 3072505536, 133 clinicians

Crystal Run Healthcare Physicians LLPGroup PAC ID 6901792696, 366 clinicians

St James HospitalGroup PAC ID 0345154480, 130 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Good Samaritan Hospital Medical Center Hospital, West Islip, NY, CCN 330286
• St Anthony Community Hospital Hospital, Warwick, NY, CCN 330205
• Nicholas H Noyes Memorial Hospital Hospital, Dansville, NY, CCN 330238
• Peconic Bay Medical Center Hospital, Riverhead, NY, CCN 330107
• St James Hospital Hospital, Hornell, NY, CCN 330151

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

Practice roles

Locations

Networks

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

Interoperability endpoints

• Direct secure messaging: sratnasignam572183@direct.urmc.rochester.edu

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Central Suffolk Hospital

  dba Peconic Bay Medical Center Professional Group Practice

  • Hospitalist Physician
  • Riverhead, NY
  • NPI 1043402050
  Medicare reassignment Care Compare group NPD
• Crystal Run Healthcare Physicians LLP

  • General Practice Physician
  • Middletown, NY
  • NPI 1952376410

  Internal Medicine

  Medicare reassignment Care Compare group NPD
• Nicholas H. Noyes Memorial Hospital

  • General Acute Care Hospital
  • Dansville, NY
  • NPI 1982625661
  Medicare reassignment Care Compare group NPD
• St James Hospital

  • Rural Acute Care Hospital
  • Hornell, NY
  • NPI 1013985399
  Medicare reassignment Care Compare group NPD
• Southwest Suffolk Medical, P.C.

  • Surgical Oncology Physician
  • Smithtown, NY
  • NPI 1104096049
  Medicare reassignment Care Compare group
• Cayuga Medical Associates, PC

  • Internal Medicine Physician
  • Ithaca, NY
  • NPI 1679525455
  Medicare reassignment NPD
• Guthrie Medical Group, P.C.

  • Multi-Specialty Clinic/Center
  • Corning, NY
  • NPI 1134178635
  Medicare reassignment NPD
• Icahn School of Medicine at Mount Sinai

  dba Mount Sinai Queens Doctors

  • Internal Medicine Physician
  • Astoria, NY
  • NPI 1477932275
  Medicare reassignment
• Central Suffolk Hosptial

  dba Peconic Bay Medical Center

  • Nurse Practitioner
  • Riverhead, NY
  • NPI 1841637741
  NPD
• Crystal Run Healthcare Physicians LLP

  • Durable Medical Equipment & Medical Supplies
  • Monroe, NY
  • NPI 1558857425
  NPD
• Guthrie Medical Group, P.C.

  • General Practice Physician
  • Sayre, PA
  • NPI 1245246644

  Internal Medicine

  NPD
• Central Suffolk Hospital

  dba Peconic Bay Medical Center

  • General Acute Care Hospital
  • Riverhead, NY
  • NPI 1386649804
  NPD (past)

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

• Central Suffolk Hospital

  dba Peconic Bay Medical Center

  • General Acute Care Hospital
  • Riverhead, NY
  • NPI 1386649804
  Care Compare affiliation
• Good Samaritan Hospital Medical Center

  • General Acute Care Hospital
  • West Islip, NY
  • NPI 1902865355
  Care Compare affiliation
• Nicholas H. Noyes Memorial Hospital

  • General Acute Care Hospital
  • Dansville, NY
  • NPI 1982625661
  Care Compare affiliation
• St James Hospital

  • Rural Acute Care Hospital
  • Hornell, NY
  • NPI 1013985399
  Care Compare affiliation
• St. Anthony Community Hospital

  • General Acute Care Hospital
  • Warwick, NY
  • NPI 1598755324
  Care Compare affiliation

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

{
    "created_epoch": "1468022400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1782000000000",
    "number": "1184076507",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1000 MONTAUK HWY",
            "city": "WEST ISLIP",
            "state": "NY",
            "postal_code": "117954927",
            "telephone_number": "631-376-3000"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "155 CRYSTAL RUN RD",
            "city": "MIDDLETOWN",
            "state": "NY",
            "postal_code": "109414028",
            "telephone_number": "845-703-6999",
            "fax_number": "845-703-6297"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "RATNASINGAM",
        "first_name": "SHAMANTHY",
        "name_prefix": "Dr.",
        "credential": "M.D",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2016-07-09",
        "last_updated": "2026-06-21",
        "certification_date": "2026-06-21",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208M00000X",
            "taxonomy_group": "",
            "desc": "Hospitalist",
            "state": "NY",
            "license": "299495",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Allison B Randolph V, MD, MBA
• Theresa Ann Raposo Marques, MPAS; APA
• Ronald Raspa, MD
• Jacqueline Anne Rastu
• Ratna Sabnis MD PLLC
• Eureka Ravilus-Oladeji
• Jay J. Rawal, M.D.
• Valerie Michelena Rawding
• RC Ward Addiction Treatment Center
• Real Talk Therapy Counseling Services, LCSW, PLLC

• Hospitalist Physician in Middletown, NY
• Providers in Middletown, NY by specialty
• Hospitalist Physician in New York

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 21, 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.