William Cherniak, MD, MPH

Primary specialty

Emergency Medicine PhysicianTaxonomy code 207P00000X

License

A157750 Issued in CA

Practice address

881 Dover Dr Ste 200
Newport Beach, CA 92663-6922

Phone

(888) 610-4659

NPI assigned

Dec 29, 2015

Sex

Male

Sole proprietor

Yes

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

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Enrolled in MD, CA, NY3 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 3

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: wcherniak900953@direct.memorialcare.org

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.

• Rocket Doctor Practice Group, P.C.

  • Emergency Medicine Physician
  • Newport Beach, CA
  • NPI 1194403642

  MD, NY

  Medicare reassignment NPD Authorized official
• Rocket Doctor Practice Group, P.C.

  • Emergency Medicine Physician
  • Lutherville Timonium, MD
  • NPI 1104714997
  NPD Authorized official

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

{
    "created_epoch": "1451347200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1786406400000",
    "number": "1649635095",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2219 MAIN ST UNIT 653",
            "city": "SANTA MONICA",
            "state": "CA",
            "postal_code": "904052217",
            "telephone_number": "831-777-4283"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "881 DOVER DR STE 200",
            "city": "NEWPORT BEACH",
            "state": "CA",
            "postal_code": "926636922",
            "telephone_number": "888-610-4659"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "CHERNIAK",
        "first_name": "WILLIAM",
        "name_prefix": "Dr.",
        "credential": "MD, MPH",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2015-12-29",
        "last_updated": "2026-08-11",
        "certification_date": "2026-08-11",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "CA",
            "license": "A157750",
            "primary": true
        },
        {
            "code": "261QU0200X",
            "taxonomy_group": "",
            "desc": "Clinic/Center, Urgent Care",
            "state": "MD",
            "license": "D80655",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Yenyi Chen, L.AC
• Yin-Hsuan Chen
• Sherry Sufang Cheng, MFT
• Tiffany Cheng
• Henry Cheong, DPT
• Brian Mark Chesnie, M.D.
• Brian Cheung, MD
• Luke P Cheung, M.D.
• Kalyan Chhong
• CHI Therapy Center

• Emergency Medicine Physician in Newport Beach, CA
• Providers in Newport Beach, CA by specialty
• Emergency Medicine Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 11, 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.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.