NPIMap

Individual provider Active NPI

Stephen Lloyd Catalya, MD

  • Infectious Disease Physician
  • Pleasant Hill, CA
National Provider Identifier
1881100832
Registry record updated Nov 13, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Infectious Disease PhysicianTaxonomy code 207RI0200X
License
A153090 Issued in CA
Practice address
400 Taylor Blvd Ste 102
Pleasant Hill, CA 94523-2147
Phone
(925) 671-7629
Fax
(925) 978-0991
NPI assigned
Dec 28, 2017
Last updated
Nov 13, 2025By the provider in NPPES
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Nov 13, 2025

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Infectious Disease Physician 207RI0200X A153090 CA Primary

Addresses

Primary practice location

400 Taylor Blvd Ste 102
Pleasant Hill, CA 94523-2147

Mailing address

2500 Mowry Ave Ste 255
Fremont, CA 94538-1605
Phone (510) 248-1550

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
I20200929000705 CA Practitioner - Infectious DiseasePractitioner - Internal Medicine 9537408059 Reassigns benefits to 3 organizations

Care Compare profile

Medicare Care Compare
Specialty
Infectious DiseaseAlso: Internal Medicine
Education
Other, 2014
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
Epic CareGroup PAC ID 5890053094, 54 clinicians

Practice addresses (Care Compare)

400 Taylor Blvd
Suite 102
Pleasant Hill, CA 94523-2147
Phone (925) 687-2570

Hospital & facility affiliations

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
A153090CAMDInfectious Disease Physician

Practice roles

OrganizationSpecialtyStatusNew patients
John Muir Trauma Physicians Billing Service Current Accepting new patients
Washington Township Medical Foundation Infectious Disease CurrentSince Aug 31, 2020 Accepting new patients
Washington Township Medical Foundation CurrentSince Aug 31, 2020 Accepting new patients
Epic Care CurrentSince Jul 5, 2023 Accepting new patients
John Muir Trauma Physicians Billing Service Infectious Disease CurrentSince Jun 22, 2025 Accepting new patients
Dayton Osteopathic Hospital Past Accepting new patients
Sutter Delta Medical Center Past Accepting new patients
Bass Medical Group Past Accepting new patients
Washington Township Hospital District Past Accepting new patients
John Muir Health Past Accepting new patients
John Muir Health Past Accepting new patients
San Ramon Regional Medical Center, LLC Past Accepting new patients

Locations

2345 Country Hills Dr
Antioch, CA 94509
Phone (925) 418-0278

2500 Mowry Ave
Ste 255
Fremont, CA 94538

2557 Mowry Ave
Ste 12
Fremont, CA 94538
Phone (510) 248-1550

39500 Fremont Blvd
Ste 100
Fremont, CA 94538
Phone (510) 248-1800

1601 Ygnacio Valley Rd
Walnut Creek, CA 94598
Phone (925) 295-1545

Interoperability endpoints

  • Direct secure messaging: scatalya125426@direct.whhs.com
  • Direct secure messaging: scatalya152313@ehr.johnmuirhealth.com
  • Direct secure messaging: scatalya561030@hisp.ehr.sutterhealth.org

Organizations & group practices 12

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 2

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": "1514419200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1762992000000",
    "number": "1881100832",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2500 MOWRY AVE STE 255",
            "city": "FREMONT",
            "state": "CA",
            "postal_code": "945381605",
            "telephone_number": "510-248-1550"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "400 TAYLOR BLVD STE 102",
            "city": "PLEASANT HILL",
            "state": "CA",
            "postal_code": "945232147",
            "telephone_number": "925-671-7629",
            "fax_number": "925-978-0991"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "CATALYA",
        "first_name": "STEPHEN",
        "middle_name": "LLOYD",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2017-12-28",
        "last_updated": "2025-11-13",
        "certification_date": "2025-11-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RI0200X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Infectious Disease",
            "state": "CA",
            "license": "A153090",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Pleasant Hill, CA

Sources for this page

Verify at the official NPI Registry.