NPIMap

Individual provider Active NPI

Thomas S Lam, M.D.

  • Gastroenterology Physician
  • Alhambra, CA
National Provider Identifier
1437185295
Registry record updated Jun 17, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Gastroenterology PhysicianTaxonomy code 207RG0100X
License
A44280 Issued in CA
Practice address
333 S Garfield Ave Ste a
Alhambra, CA 91801-3895
Phone
(626) 284-1997
Fax
(626) 284-2549
NPI assigned
Jun 24, 2006
Last updated
Jun 17, 2025By the provider in NPPES
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Jun 17, 2025

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Gastroenterology Physician 207RG0100X A44280 CA Primary

Addresses

Primary practice location

333 S Garfield Ave Ste a
Alhambra, CA 91801-3895

Mailing address

PO Box 7589
Alhambra, CA 91802-7589
Phone (626) 284-1997

Other identifiers 2

IdentifierTypeStateIssuer
00A442801MedicaidCA
00A442800MedicaidCA

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
I20040727001651 CA Practitioner - GastroenterologyPractitioner - Internal Medicine 4284621731 Reassigns benefits to 2 organizations

Care Compare profile

Medicare Care Compare
Specialty
GastroenterologyAlso: Internal Medicine
Education
Other, 1981
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
Amg a Professional Medical CorporationGroup PAC ID 9830092279, 27 clinicians

Practice addresses (Care Compare)

925 S Garfield Ave
Alhambra, CA 91801-4442
Phone (626) 282-0282

Procedures performed for Medicare patients

ProcedureNumber of procedures
Colonoscopy1-10
Upper gastrointestinal (GI) endoscopy for acid reflux1-10

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
A44280CAMDGastroenterology Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Allied Pacific Hospice LLC CurrentSince Jul 3, 2019 Accepting new patients
Amg, a Professional Medical Corporation CurrentSince Dec 1, 2023 Accepting new patients
1 World Medicine Urgent Care Corp CurrentSince Jun 10, 2020 Accepting new patients
Astrana Care Hospitalists, a Medical Corporation PastSince Sep 23, 2022 Accepting new patients
David C P Chen, M.D., Inc PastSince Nov 30, 2024 Accepting new patients
Sun Clinical Laboratories PastSince Aug 1, 2021 Accepting new patients
Amg, a Professional Medical Corp Past Accepting new patients
Enhanced Care Management PastSince Oct 10, 2023 Accepting new patients
Dr Yong Liang Medical Office Inc PastSince Jan 1, 2007 Accepting new patients
Southern California Heart Centers a Medical Corporation Past Accepting new patients
99 Medical Equipment, Healthcare Supplies & Wheelchair Center PastSince Jan 8, 2016 Accepting new patients

Locations

1668 S Garfield Ave
Fl 2
Alhambra, CA 91801
Phone (626) 282-0288

328 S 1st St
Ste F
Alhambra, CA 91801
Phone (626) 457-6333

333 S Garfield Ave
Ste A
Alhambra, CA 91801
Phone (626) 284-1997

925 S Garfield Ave
Alhambra, CA 91801
Phone (626) 300-8388

710 N Euclid St
Ste 101
Anaheim, CA 92801
Phone (714) 517-2000

120 W Hellman Ave
Ste 101
Monterey Park, CA 91754
Phone (626) 282-0261

Ownership & related parties

All facility ownership & control disclosures 2

Facilities whose Medicare enrollment lists this provider’s PECOS associate ID as an owner or managing party.

FacilityTypeRoleSince
Sunny Village Care CenterAlhambra, CA, CCN 055203 Skilled nursing facility 5% Or Greater Direct Ownership Interest (9.6%)
Operational/Managerial Control
Adp of the SNF
Direct Ownership Interest		 Oct 15, 2010
Oct 15, 2010
Oct 15, 2010
Oct 15, 2010
Allied HospiceAlhambra, CA, CCN 921752 Hospice Corporate Director
Operational/Managerial Control		 Jul 3, 2019
Jul 3, 2019

Owned or controlled facilities with NPI records 2

Facilities whose Medicare enrollment lists this provider as an owner, officer, director or managing party.

Organizations & group practices 35

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.

View all 35

NPI Registry JSON

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

{
    "created_epoch": "1151107200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1750118400000",
    "number": "1437185295",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 7589",
            "city": "ALHAMBRA",
            "state": "CA",
            "postal_code": "918027589",
            "telephone_number": "626-284-1997",
            "fax_number": "626-284-2549"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "333 S GARFIELD AVE STE A",
            "city": "ALHAMBRA",
            "state": "CA",
            "postal_code": "918013895",
            "telephone_number": "626-284-1997",
            "fax_number": "626-284-2549"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "LAM",
        "first_name": "THOMAS",
        "middle_name": "S",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-06-24",
        "last_updated": "2025-06-17",
        "certification_date": "2025-06-17",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "CA",
            "license": "A44280",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "00A442801",
            "state": "CA"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "00A442800",
            "state": "CA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Alhambra, CA

Sources for this page

Verify at the official NPI Registry.