Mark K Ono, MD

Primary specialty

Radiation Oncology PhysicianTaxonomy code 2085R0001X

License

34123 Issued in AZ

Practice address

PO Box 4571
Scottsdale, AZ 85261-4571

Phone

(480) 254-8613

NPI assigned

Feb 17, 2006

Last updated

Sep 11, 2025By the provider in NPPES

Sex

Male

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Other identifiers 2

Medicare fee-for-service enrollment

Enrolled in AZ, TX, OH, MI, GA, DE6 enrollments

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 6

Specialty

Radiation Oncology

Education

University of Illinois College of Med (CHI/Peor/Rock/CHM-Urb), 1990

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Bayhealth Medical Center, IncGroup PAC ID 1658364740, shared by 16 NPIs, 399 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Bayhealth Medical Center, Kent Campus Hospital, Dover, DE, CCN 080004
• Bayhealth Hospital, Sussex Campus Hospital, Milford, DE, CCN 080009

Merit-based Incentive Payment System (MIPS)

Final score

78.51 of 100Reported as group

Quality

63.02

Promoting interoperability

100

Improvement activities

40

Cost

65.34

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: mono3788416@direct.trinity-health.org

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.

• Ironwood Physicians, PC

  dba Ironwood Cancer & Research Centers, PC

  • Hematology & Oncology Physician
  • Chandler, AZ
  • NPI 1740269299

  Radiation Oncology

  Medicare reassignment NPD
• Bayhealth Medical Center, Inc

  dba Bayhealth Radiation Oncology, Kent Campus

  • Radiation Oncology Physician
  • Dover, DE
  • NPI 1841757739
  Medicare reassignment NPD
• Bayhealth Medical Center, Inc.

  dba Bayhealth Radiation Oncology, Sussex Campus

  • Radiation Oncology Physician
  • Milford, DE
  • NPI 1760949606
  Medicare reassignment NPD
• Bayhealth Radiologists LLC

  • Diagnostic Radiology Physician
  • Dover, DE
  • NPI 1366214124

  AZ

  Medicare reassignment NPD
• Hendrick Provider Network

  • Internal Medicine Physician
  • Abilene, TX
  • NPI 1396961322

  Family Medicine

  Medicare reassignment NPD
• Johnson Family Center for Cancer Care

  • Radiation Oncology Clinic/Center
  • Muskegon, MI
  • NPI 1639368293
  Medicare reassignment NPD
• Mercy Health Physicians Lorain Specialty Care LLC

  • Surgery Physician
  • Lorain, OH
  • NPI 1972126381
  Medicare reassignment NPD
• Mercy Health Physicians Youngstown Specialty Care LLC

  • Surgery Physician
  • Youngstown, OH
  • NPI 1649892225
  Medicare reassignment NPD
• Neo Urology Associates Inc

  • Urology Physician
  • Boardman, OH
  • NPI 1598798878
  Medicare reassignment NPD
• SJC Oncology Services - Georgia, LLC

  • Radiation Oncology Physician
  • Savannah, GA
  • NPI 1710196589
  Medicare reassignment NPD
• Ironwood Physicians, PC

  • Hematology & Oncology Physician
  • Goodyear, AZ
  • NPI 1598514408
  NPD
• Bayhealth Medical Center, Inc

  • Gastroenterology Physician
  • Milford, DE
  • NPI 1639938525
  NPD

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

• Bayhealth Medical Center, Inc.

  dba Bayhealth Hospital, Sussex Campus

  • General Acute Care Hospital
  • Milford, DE
  • NPI 1023006434
  Care Compare affiliation
• Bayhealth Medical Center, Inc.

  dba Bayhealth Hospital, Kent Campus

  • General Acute Care Hospital
  • Dover, DE
  • NPI 1467546135
  Care Compare affiliation

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

{
    "created_epoch": "1140134400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1757548800000",
    "number": "1427022144",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 4571",
            "city": "SCOTTSDALE",
            "state": "AZ",
            "postal_code": "852614571"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "PO BOX 4571",
            "city": "SCOTTSDALE",
            "state": "AZ",
            "postal_code": "852614571",
            "telephone_number": "480-254-8613"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "640 S State St",
            "address_purpose": "LOCATION",
            "city": "Dover",
            "state": "DE",
            "postal_code": "199013530",
            "country_code": "US",
            "telephone_number": "302-744-7000",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "ONO",
        "first_name": "MARK",
        "middle_name": "K",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-02-17",
        "last_updated": "2025-09-11",
        "certification_date": "2025-09-11",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2085R0001X",
            "taxonomy_group": "",
            "desc": "Radiology, Radiation Oncology",
            "state": "AZ",
            "license": "34123",
            "primary": true
        },
        {
            "code": "2085R0001X",
            "taxonomy_group": "",
            "desc": "Radiology, Radiation Oncology",
            "state": "DE",
            "license": "C1-0028619",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "949167",
            "state": "AZ"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "RAILROAD MEDICARE",
            "identifier": "P00276752",
            "state": "AZ"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Onestophealthaz
• Ong Plastic Surgery
• Jonathan Ong, MD
• Karen Melinda Ong, MD
• Brian D Onisko, PTA
• Kelly Catherine Ontiveros, LICENSED MARRIAGE &
• Leticia Ontiveros, RDH
• Onward True PLLC
• Nelson O Onyango, MD
• Jacob Saj Oommen, M.D

• Radiation Oncology Physician in Scottsdale, AZ
• Providers in Scottsdale, AZ by specialty
• Radiation Oncology Physician in Arizona

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 11, 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.