Ahmad Abou Abbass, M.D

Primary specialty

Surgical Oncology PhysicianTaxonomy code 2086X0206X

License

A152200 Issued in CA

Practice address

26732 Crown Valley Pkwy Ste 351
Mission Viejo, CA 92691

Phone

(949) 364-1007

Fax

(949) 364-6057

NPI assigned

Jun 20, 2008

Last updated

Apr 9, 2026By 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 3

Addresses

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in CA

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

General Surgery

Education

Other, 2002

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

City of Hope Medical FoundationGroup PAC ID 3779751656, 964 clinicians

South Orange County Surgical Medical Group IncGroup PAC ID 8426945338, 22 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Providence Mission Hospital Hospital, Mission Viejo, CA, CCN 050567
• City of Hope Helford Clinical Research Hospital Hospital, Duarte, CA, CCN 050146
• Memorialcare Saddleback Medical Center Hospital, Laguna Hills, CA, CCN 050603

Merit-based Incentive Payment System (MIPS)

Final score

77.23 of 100Reported as group

Quality

36.36

Promoting interoperability

100

Improvement activities

40

Cost

71.06

Merit-based Incentive Payment System (MIPS)

Final score

87.08 of 100Reported as group

Quality

62.67

Promoting interoperability

100

Improvement activities

40

Cost

85.6

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Networks

• BSC 65 PLUS INDIVIDUAL MAPD

Interoperability endpoints

• Direct secure messaging: ahmad.abou.abbass.1@12518.direct.athenahealth.com
• Direct secure messaging: direct@cityofhope.direct-ci.com
• FHIR API: https://api.platform.athenahealth.com/12518/brand/2/csg/1/fhir/r4

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.

• City of Hope Medical Foundation

  dba City of Hope Duarte

  • Hematology & Oncology Physician
  • Duarte, CA
  • NPI 1871886366

  Surgery

  Medicare reassignment Care Compare group NPD
• South Orange County Surgical Medical Group, Inc.

  • Surgery Physician
  • Laguna Hills, CA
  • NPI 1407860844
  Medicare reassignment Care Compare group NPD
• Oc Trauma Inc

  • Trauma Surgery Physician
  • Mission Viejo, CA
  • NPI 1720516628
  Medicare reassignment NPD
• Orohealth Corporation a Non Profit Healthcare System

  dba Orohealth Professional Group

  • Family Medicine Physician
  • Oroville, CA
  • NPI 1013933167
  Medicare reassignment NPD
• Mission Hospital Regional Medical Center

  dba Providence Mission Hospital

  • Rehabilitation Hospital
  • Mission Viejo, CA
  • NPI 1003956913
  NPD (past)
• Saddleback Memorial Medical Center

  • Rehabilitation Hospital Unit
  • Laguna Hills, CA
  • NPI 1114967114
  NPD (past)
• Henry Ford Macomb Hospital Corporation

  • General Acute Care Hospital
  • Warren, MI
  • NPI 1902842735
  NPD (past)

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

• City of Hope National Medical Center

  • General Acute Care Hospital
  • Duarte, CA
  • NPI 1750358297
  Care Compare affiliation
• Mission Hospital Regional Medical Center

  dba Providence Mission Hospital

  • General Acute Care Hospital
  • Mission Viejo, CA
  • NPI 1912108002
  Care Compare affiliation
• Mission Hospital Regional Medical Center

  dba Mission Hospital

  • General Acute Care Hospital
  • Mission Viejo, CA
  • NPI 1992752315
  Care Compare affiliation
• Saddleback Memorial Medical Center

  • General Acute Care Hospital
  • Laguna Hills, CA
  • NPI 1275576381
  Care Compare affiliation

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

{
    "created_epoch": "1213920000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1775692800000",
    "number": "1790946895",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "26732 CROWN VALLEY PKWY STE 351",
            "city": "MISSION VIEJO",
            "state": "CA",
            "postal_code": "926916374",
            "telephone_number": "949-364-1007",
            "fax_number": "949-364-6057"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "26732 CROWN VALLEY PKWY STE 351",
            "city": "MISSION VIEJO",
            "state": "CA",
            "postal_code": "92691",
            "telephone_number": "949-364-1007",
            "fax_number": "949-364-6057"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "1000 Fivepoint Ste A",
            "address_purpose": "LOCATION",
            "city": "Irvine",
            "state": "CA",
            "postal_code": "926182621",
            "country_code": "US",
            "telephone_number": "949-671-8000",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "ABOU ABBASS",
        "first_name": "AHMAD",
        "name_prefix": "Dr.",
        "credential": "M.D",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2008-06-20",
        "last_updated": "2026-04-09",
        "certification_date": "2026-04-09",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "204F00000X",
            "taxonomy_group": "",
            "desc": "Transplant Surgery",
            "state": "MI",
            "license": "4301091303",
            "primary": false
        },
        {
            "code": "208600000X",
            "taxonomy_group": "",
            "desc": "Surgery",
            "state": "MI",
            "license": "4301091303",
            "primary": false
        },
        {
            "code": "2086X0206X",
            "taxonomy_group": "",
            "desc": "Surgery, Surgical Oncology",
            "state": "CA",
            "license": "A152200",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "direct@cityofhope.direct-ci.com",
            "affiliation": "Y",
            "affiliationName": "CITY OF HOPE MEDICAL FOUNDATION",
            "use": "DIRECT",
            "useDescription": "Direct",
            "address_1": "1000 Fivepoint",
            "city": "Irvine",
            "state": "CA",
            "country_code": "US",
            "postal_code": "926182377",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Shenoda Yousef Azmy Abd Elmaseh
• Iman Abdeshahian, D.M.D.
• Azhar Abdullah, MD
• Brittany Abelson, FNP
• Abiding Home Care LLC
• Bency Ann Abraham, D.O.
• Soodabeh Abravesh, M.D.
• Abundant Hands Care Inc. (St. Joseph's Home)
• Malia Ackerman, M.A., LMFT
• Active Life, LLC

• Surgical Oncology Physician in Mission Viejo, CA
• Providers in Mission Viejo, CA by specialty
• Surgical Oncology Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Apr 9, 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.