Marissa Anne Ontis, FNP-C

Primary specialty

Family Nurse PractitionerTaxonomy code 363LF0000X

License

209025582 Issued in IL

Practice address

1 Memorial Dr # G181
Alton, IL 62002-6755

Phone

(618) 433-7066

Fax

(618) 433-7060

NPI assigned

Jul 28, 2022

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

Other names 1

• Marissa Anne Delp Former name

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in IL, MO2 enrollments

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: No

Green means eligible to order or refer.

Enrollment records 2

Specialty

Nurse Practitioner

Education

Other, 2022

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Healogics Specialty Physicians of Illinois, LLCGroup PAC ID 4486877511, 14 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Alton Memorial Hospital Hospital, Alton, IL, CCN 140002
• Memorial Hospital Hospital, Belleville, IL, CCN 140185
• Barnes Jewish Hospital Hospital, Saint Louis, MO, CCN 260032
• Osf Saint Anthony's Health Center Hospital, Alton, IL, CCN 140052

Merit-based Incentive Payment System (MIPS)

Final score

91.05 of 100Reported as apm

Quality

72.1

Promoting interoperability

100

Improvement activities

40

Medicare enrollment (NPD)

Enrolled

Credentials

Nurse Practitioner

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: marissa.ontis@healogics.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.

• Healogics Specialty Physicians of Illinois, LLC

  • Undersea and Hyperbaric Medicine (Preventive Medicine) Physician
  • Alton, IL
  • NPI 1215355110

  Family Medicine

  Medicare reassignment Care Compare group NPD
• Healogics Specialty Physicians of Missouri, LLC

  • Undersea and Hyperbaric Medicine (Preventive Medicine) Physician
  • Joplin, MO
  • NPI 1528468311

  Family Medicine

  Medicare reassignment NPD
• Jersey Community Hospital

  • Personal Emergency Response Attendant
  • Jerseyville, IL
  • NPI 1780609925
  NPD
• Jersey Community Hospital

  dba JCH Medical Group - Jerseyville II

  • Rural Health Clinic/Center
  • Jerseyville, IL
  • NPI 1659750818

  Family Medicine

  NPD (past)
• Jersey Community Hospital District

  dba JCH Medical Group

  • Family Medicine Physician
  • Jerseyville, IL
  • NPI 1134163827
  NPD (past)

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

• Alton Memorial Hospital

  • Ambulance
  • Alton, IL
  • NPI 1063669117

  Hospital

  Care Compare affiliation
• Alton Memorial Hospital

  • General Acute Care Hospital
  • Alton, IL
  • NPI 1548278476
  Care Compare affiliation
• Osf Healthcare System

  dba Osf Saint Anthony's Health Center

  • General Acute Care Hospital
  • Alton, IL
  • NPI 1710396932
  Care Compare affiliation
• Protestant Memorial Medical Center, Inc.

  dba Memorial Hospital

  • General Acute Care Hospital
  • Belleville, IL
  • NPI 1982796181
  Care Compare affiliation
• Barnes Jewish Hospital

  • General Acute Care Hospital
  • Saint Louis, MO
  • NPI 1649299827
  Care Compare affiliation

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

{
    "created_epoch": "1658966400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1777593600000",
    "number": "1629704929",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1 MEMORIAL DR # G-181",
            "city": "ALTON",
            "state": "IL",
            "postal_code": "620026722",
            "telephone_number": "618-433-4066",
            "fax_number": "618-433-7060"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1 MEMORIAL DR # G181",
            "city": "ALTON",
            "state": "IL",
            "postal_code": "620026755",
            "telephone_number": "618-433-7066",
            "fax_number": "618-433-7060"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "ONTIS",
        "first_name": "MARISSA",
        "middle_name": "ANNE",
        "name_prefix": "Mrs.",
        "credential": "FNP-C",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2022-07-28",
        "last_updated": "2026-05-01",
        "certification_date": "2026-05-01",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "IL",
            "license": "209025582",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "marissa.ontis@healogics.com",
            "affiliation": "Y",
            "endpointDescription": "email",
            "affiliationName": "Healogics Specialty Physicians of Illinois, LLC",
            "use": "DIRECT",
            "useDescription": "Direct",
            "address_1": "1 Memorial Dr # G181",
            "city": "Alton",
            "state": "IL",
            "country_code": "US",
            "postal_code": "620026755",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": [
        {
            "first_name": "MARISSA",
            "last_name": "DELP",
            "middle_name": "ANNE",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

• Marilyn Ojeda, CRNA
• Kasiemobi Bernice Okonkwo, MD
• Oghenero Lucky Olomukoro, PMHNP-BC
• Aaron Patrick Omotola, M.D.
• Mohamedtarek A Omran, BDS
• Kelsey Marie Orf, AGNP
• Samantha Orlandini, AS
• Orthopaedic Solutions, Inc
• Orthopedic & Sports Medicine Clinic, P.C.
• Terry Jon Ortman, D.D.S.

• Family Nurse Practitioner in Alton, IL
• Providers in Alton, IL by specialty
• Family Nurse Practitioner in Illinois

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 1, 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.