NPIMap

Individual provider Active NPI

Gary Alan Bass, MD

  • Surgery Physician
  • Philadelphia, PA
National Provider Identifier
1881924801
Registry record updated May 21, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Surgery PhysicianTaxonomy code 208600000X
License
MD472249 Issued in PA
Practice address
3400 Spruce Street
Philadelphia, PA 19104-3309
Phone
(215) 349-8310
Fax
(215) 893-7270
NPI assigned
Jan 14, 2010
Last updated
May 21, 2026By the provider in NPPES
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on May 21, 2026

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Surgery Physician 208600000X MD472249 PA Primary
Surgical Critical Care Physician 2086S0102X MD472249 PA

Addresses

Primary practice location

3400 Spruce Street
Philadelphia, PA 19104-3309

Mailing address

3400 Spruce Street
Philadelphia, PA 19104-3309
Phone (215) 349-8310

Other practice location 1

51 North 39th Street
Medical Office Building Suite 120 (Trauma)
Philadelphia, PA 19104
Phone (216) 316-5151

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in PA
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
I20210709000483 PA Practitioner - General Surgery 5395147623 Reassigns benefits to 2 organizations

Care Compare profile

Medicare Care Compare
Specialty
General Surgery
Education
Other, 2006
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
University of Penn-Medical GroupGroup PAC ID 6204730955, shared by 15 NPIs, 3,433 clinicians

Practice addresses (Care Compare)

1800 Lombard St
Suite 206
Philadelphia, PA 19146-1414
Phone (215) 615-2222

3400 Spruce St
Philadelphia, PA 19104-4238
Phone (215) 349-8310

Hospital & facility affiliations

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

Practice roles

OrganizationSpecialtyStatusNew patients
University of Penn - Medical Group Current Accepting new patients
University of Penn - Medical Group CurrentSince Aug 1, 2021 Accepting new patients
University of Penn-Medical Group Current Accepting new patients
University of Penn-Medical Group CurrentSince Aug 1, 2021 Accepting new patients
University of Penn-Medical Group CurrentSince Aug 1, 2021 Accepting new patients
University of Penn - Medical Group Past Accepting new patients
Presbyterian Medical Center of the University of Pennsylvania Health S Past Accepting new patients
Trustees of the University of Pennsylvania Past Accepting new patients

Locations

1800 Lombard St
Ste 206
Philadelphia, PA 19146
Phone (215) 615-2222

3624 Market St
Fl 2
Philadelphia, PA 19104
Phone (215) 615-3669

800 Spruce St
William Penn Annex West, PA 19107
Phone (215) 829-3867

Organizations & group practices 8

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": "1263427200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1779321600000",
    "number": "1881924801",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "3400 SPRUCE STREET",
            "city": "PHILADELPHIA",
            "state": "PA",
            "postal_code": "191043309",
            "telephone_number": "215-349-8310",
            "fax_number": "215-893-7270"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "3400 SPRUCE STREET",
            "city": "PHILADELPHIA",
            "state": "PA",
            "postal_code": "191043309",
            "telephone_number": "215-349-8310",
            "fax_number": "215-893-7270"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "51 North 39th Street",
            "address_2": "Medical Office Building Suite 120 (Trauma)",
            "address_purpose": "LOCATION",
            "city": "Philadelphia",
            "state": "PA",
            "postal_code": "19104",
            "country_code": "US",
            "telephone_number": "216-316-5151",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "BASS",
        "first_name": "GARY",
        "middle_name": "ALAN",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2010-01-14",
        "last_updated": "2026-05-21",
        "certification_date": "2026-05-21",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208600000X",
            "taxonomy_group": "",
            "desc": "Surgery",
            "state": "PA",
            "license": "MD472249",
            "primary": true
        },
        {
            "code": "2086S0102X",
            "taxonomy_group": "",
            "desc": "Surgery, Surgical Critical Care",
            "state": "PA",
            "license": "MD472249",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Philadelphia, PA

Sources for this page

Verify at the official NPI Registry.