NPIMap

Individual provider Active NPI

May Cheng-Su Chen, MD

  • Medical Oncology Physician
  • Chicago, IL
National Provider Identifier
1386603447
Registry record updated Aug 25, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Medical Oncology PhysicianTaxonomy code 207RX0202X
License
036181196 Issued in IL
Practice address
5841 S Maryland Ave
Chicago, IL 60637-1443
Phone
(888) 824-0200
NPI assigned
Mar 18, 2006
Last updated
Aug 25, 2026By the provider in NPPES
Sex
Female
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Aug 25, 2026

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Medical Oncology Physician 207RX0202X 036181196 IL Primary

Addresses

Primary practice location

5841 S Maryland Ave
Chicago, IL 60637-1443

Mailing address

150 Harvester Dr Ste 300
Burr Ridge, IL 60527-5965

Other identifiers 2

IdentifierTypeStateIssuer
00G838840MedicaidCA
900003982OtherCAMEDICARE RAILROAD

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in CA
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20041210000590 CA Practitioner - Medical OncologyPractitioner - Internal MedicinePractitioner - Hematology/Oncology 5991762072 Reassigns benefits to 2 organizations

Care Compare profile

Medicare Care Compare
Specialty
Medical OncologyAlso: Hematology/Oncology, Internal Medicine
Education
Yale University School of Medicine, 1993
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
Stanford Health CareGroup PAC ID 6709797491, 3,152 clinicians

Practice addresses (Care Compare)

300 Pasteur Dr
Stanford, CA 94305-2200
Phone (650) 723-4000

Hospital & facility affiliations

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
83884CAMDMarriage & Family Therapist
036181196ILMDMedical Oncology Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Stanford Health Care CurrentSince Jun 1, 2015 Accepting new patients
Stanford Health Care CurrentSince Jun 1, 2015 Accepting new patients
University Healthcare Alliance CurrentSince Mar 1, 2013 Accepting new patients
County of Santa Clara Past Accepting new patients
Stanford Hospital and Clinics Past Accepting new patients
Good Samaritan Hospital Ca LTD PTP Past Accepting new patients
Pih Health Good Samaritan Hospital Past Accepting new patients

Locations

50 E Hamilton Ave
Ste 200
Campbell, CA 95008
Phone (408) 376-2300

50 E Hamilton Ave
Ste 280
Campbell, CA 95008
Phone (408) 227-2646

1300 Crane St
Menlo Park, CA 94025
Phone (510) 785-5000

2589 Samaritan Dr
San Jose, CA 95124
Phone (408) 357-1060

300 Pasteur Dr
Stanford, CA 94305
Phone (650) 498-5710

300 Pasteur Dr
#5500
Stanford, CA 94305
Phone (415) 723-5525

Interoperability endpoints

  • Direct secure messaging: mchen43691@direct.stanfordhealthcare.org
  • Direct secure messaging: mchen56663@santaclaravalley.direct-ci.net

Organizations & group practices 7

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.

Hospital & facility affiliations 12

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

NPI Registry JSON

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

{
    "created_epoch": "1142640000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1787616000000",
    "number": "1386603447",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "150 HARVESTER DR STE 300",
            "city": "BURR RIDGE",
            "state": "IL",
            "postal_code": "605275965"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "5841 S MARYLAND AVE",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606371443",
            "telephone_number": "888-824-0200"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "CHEN",
        "first_name": "MAY",
        "middle_name": "CHENG-SU",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2006-03-18",
        "last_updated": "2026-08-25",
        "certification_date": "2026-08-25",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RX0202X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Medical Oncology",
            "state": "IL",
            "license": "036181196",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "00G838840",
            "state": "CA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "MEDICARE RAILROAD",
            "identifier": "900003982",
            "state": "CA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Chicago, IL

Sources for this page

Verify at the official NPI Registry.