Individual provider Active NPI

Muhammad Muslim, MD

  • Hematology & Oncology Physician
  • Riverside, CA
National Provider Identifier
1861571218
Registry record updated Nov 20, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Hematology & Oncology PhysicianTaxonomy code 207RH0003X
License
C192251 Issued in CA
Practice address
4646 Brockton Ave Ste 203
Riverside, CA 92506-0104
Phone
(951) 394-7028
Fax
(951) 224-9899
NPI assigned
Nov 6, 2006
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Nov 20, 2025

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

Specialties & licenses 3

Specialty (taxonomy)CodeLicenseStatePrimary
Hematology & Oncology Physician 207RH0003X 44404 WI
Hematology & Oncology Physician 207RH0003X C192251 CA Primary
Hematology & Oncology Physician 207RH0003X 0452015 KS

Addresses

Primary practice location

4646 Brockton Ave Ste 203
Riverside, CA 92506-0104

Mailing address

18000 Studebaker Rd Ste 800
Cerritos, CA 90703-2671
Phone (562) 735-3226

Other practice location 1

2220 Canterbury Dr Ste 150
Hays, KS 67601-2370
Phone (785) 623-5774

Other identifiers 2

IdentifierTypeStateIssuer
1861571218MedicaidCA
34202900MedicaidWI

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in WI, CA, KS3 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

Enrollment IDStateProvider typePAC IDDetails
I20060328000484 WI Practitioner - Hematology/Oncology 4880602150 Reassigns benefits to 3 organizations
I20240425004016 CA Practitioner - Hematology/Oncology 4880602150 Reassigns benefits to 1 organization
I20251218000744 KS Practitioner - Hematology/Oncology 4880602150 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Hematology/Oncology
Education
Other, 1988
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Hays Medical Center IncGroup PAC ID 1557279676, 188 clinicians

Practice addresses (Care Compare)

2220 Canterbury Dr
Suite 150
Hays, KS 67601-2370
Phone (785) 623-5774

4646 Brockton Ave
Suite 203
Riverside, CA 92506-0104
Phone (951) 394-7028

Hospital & facility affiliations

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
C192251CAMDHematology & Oncology Physician
0452015KSMDHematology & Oncology Physician
44404WIMDHematology & Oncology Physician

Practice roles

OrganizationSpecialtyStatusNew patients
MCHS Hospitals Inc Current Accepting new patients
Hays Medical Center, Inc CurrentSince Jan 19, 2026 Accepting new patients
Marshfield Clinic Inc CurrentSince Aug 1, 2002 Accepting new patients
MCHS Hospitals Inc CurrentSince Mar 5, 2019 Accepting new patients
The Oncology Institute Ca, a Professional Corporation Hematology & Oncology CurrentSince Mar 11, 2024 Accepting new patients
Lakeview Medical Center Inc of Rice Lake CurrentSince Oct 29, 2018 Accepting new patients
Hays Medical Center, Inc. Hematology & Oncology CurrentSince Jan 19, 2026 Accepting new patients
Starling Oncology Ca, a Professional Corporation Hematology & Oncology CurrentSince Mar 11, 2024 Accepting new patients
MCHS Hospitals Inc CurrentSince Mar 5, 2019 Accepting new patients
Pawnee Valley Community Hospital Inc Past Accepting new patients

Locations

18000 Studebaker Rd
Ste 800
Cerritos, CA 90703

900 S Main St
Ste 204
Corona, CA 92882
Phone (951) 372-2400

11100 Warner Ave
Ste 214
Fountain Vly, CA 92708
Phone (714) 594-7820

6121 N Thesta St
Ste 204
Fresno, CA 93710
Phone (559) 435-2425

3300 E South St
Ste 304
Lakewood, CA 90805
Phone (562) 232-0550

4646 Brockton Ave
Ste 203
Riverside, CA 92506
Phone (951) 394-7028

399 E Highland Ave
Ste 501
Sn Bernrdno, CA 92404
Phone (909) 982-4252

425 Haaland Dr
Ste 103
Thousand Oaks, CA 91361
Phone (805) 345-2020

2067 W Vista Way
Ste 295
Vista, CA 92083
Phone (526) 735-3226

2220 Canterbury Dr
Ste 150
Hays, KS 67601
Phone (785) 623-5774

2220 Canterbury Dr
Hays, KS 67601
Phone (785) 623-5000

2655 County Highway I
Chippewa Fls, WI 54729
Phone (715) 723-8827

900 W Clairemont Ave
Eau Claire, WI 54701
Phone (715) 717-4121

1000 Starr Ave
Eau Claire, WI 54703
Phone (715) 858-4850

3501 Golf Rd
Eau Claire, WI 54701
Phone (715) 858-4200

1000 N Oak Ave
Marshfield, WI 54449
Phone (715) 387-5111

1700 W Stout St
Rice Lake, WI 54868
Phone (715) 236-6133

1020 Lakeshore Dr
Rice Lake, WI 54868
Phone (715) 236-8100

Interoperability endpoints

  • Direct secure messaging: muhammad.muslim@theoncologyinstitute.ikm.direct-ci.com
  • Direct secure messaging: muhammad.muslim@marshfieldclinichealthsystem.cernerdirect.com

Organizations & group practices 11

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 4

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": "1162771200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1763596800000",
    "number": "1861571218",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "18000 STUDEBAKER RD STE 800",
            "city": "CERRITOS",
            "state": "CA",
            "postal_code": "907032671",
            "telephone_number": "562-735-3226",
            "fax_number": "562-381-9685"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "4646 BROCKTON AVE STE 203",
            "city": "RIVERSIDE",
            "state": "CA",
            "postal_code": "925060104",
            "telephone_number": "951-394-7028",
            "fax_number": "951-224-9899"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "2220 Canterbury Dr Ste 150",
            "address_purpose": "LOCATION",
            "city": "Hays",
            "state": "KS",
            "postal_code": "676012370",
            "country_code": "US",
            "telephone_number": "785-623-5774",
            "fax_number": "785-623-5775",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "MUSLIM",
        "first_name": "MUHAMMAD",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-11-06",
        "last_updated": "2025-11-20",
        "certification_date": "2025-11-20",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RH0003X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Hematology & Oncology",
            "state": "WI",
            "license": "44404",
            "primary": false
        },
        {
            "code": "207RH0003X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Hematology & Oncology",
            "state": "CA",
            "license": "C192251",
            "primary": true
        },
        {
            "code": "207RH0003X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Hematology & Oncology",
            "state": "KS",
            "license": "0452015",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "1861571218",
            "state": "CA"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "34202900",
            "state": "WI"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Riverside, CA

Sources for this page

Verify at the official NPI Registry.