Individual provider Active NPI

Stefanie Altmann, DO

  • Internal Medicine Physician
  • Walnut Creek, CA
National Provider Identifier
1912494188
Registry record updated May 7, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Internal Medicine PhysicianTaxonomy code 207R00000X
License
PG188434 Issued in OR
Practice address
100 Pringle Ave Ste 425
Walnut Creek, CA 94596-7385
Phone
(925) 932-3800
Fax
(925) 933-3339
NPI assigned
Apr 13, 2018
Last updated
May 7, 2026By the provider in NPPES
Sex
Female
Sole proprietor
Yes

NPPES NPI Registry

Updated by the provider on May 7, 2026

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

Specialties & licenses 5

Specialty (taxonomy)CodeLicenseStatePrimary
Dermatology Physician 207N00000X UO6375 FL
Dermatology Physician 207N00000X OS18824 FL
Dermatology Physician 207N00000X 24681 CA
MOHS-Micrographic Surgery Physician 207ND0101X OS18824 FL
Internal Medicine Physician 207R00000X PG188434 OR Primary

Addresses

Primary practice location

100 Pringle Ave Ste 425
Walnut Creek, CA 94596-7385

Mailing address

4000 Hollywood Blvd Ste 215-a
Hollywood, FL 33021-6751
Phone (954) 988-0976

Other practice location 1

1010 Kennedy Dr Ste 304
Key West, FL 33040-4133
Phone (305) 296-3334

Other practice location 2

5575 W Las Positas Blvd Ste 230
Pleasanton, CA 94588-5802
Phone (925) 416-1122

Other practice location 3

82883 Overseas Highway
Islamorada, FL 33036
Phone (305) 664-8898

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in WA, CA2 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 2

Enrollment IDStateProvider typePAC IDDetails
I20250919004229 WA Practitioner - Internal Medicine 2769730472 Reassigns benefits to 1 organization
I20251205004379 CA Practitioner - Dermatology 2769730472 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Dermatology
Education
Other, 2018
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Berman Skin Institute Medical Group IncGroup PAC ID 0042407215, 26 clinicians

Practice addresses (Care Compare)

100 Pringle Ave
Suite 425
Walnut Creek, CA 94596-7385
Phone (925) 932-3800

Merit-based Incentive Payment System (MIPS)

Final score
100 of 100Reported as individual
Promoting interoperability
100
Improvement activities
40

Procedures performed for Medicare patients

ProcedureNumber of procedures
Melanoma (skin cancer) excision67
Removal of tissue1-10
Removal of skin lesions283
Removal of skin cancer298
Removal or shaving of skin growth1-10
Skin biopsy136

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
UO6375FLMDDermatology Physician
PG188434ORMDInternal Medicine Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Chesnut MD Dermatology CurrentSince Aug 25, 2025 Accepting new patients
Berman Skin Institute Medical Group Inc Dermatology CurrentSince Dec 1, 2025 Accepting new patients
Jill E. Stocker, D.O. PC PastSince May 22, 2010 Accepting new patients
University Dermatopathology Services Inc PastSince Nov 10, 2024 Accepting new patients

Locations

3581 Palmer Dr
Ste 203
Cameron Park, CA 95682
Phone (530) 676-0119

5575 W Las Positas Blvd
Ste 220
Pleasanton, CA 94588
Phone (650) 325-6000

5575 W Las Positas Blvd
Ste 230
Pleasanton, CA 94588
Phone (925) 416-1122

1792 Tribute Rd
Ste 200
Sacramento, CA 95815
Phone (916) 678-5400

1 Daniel Burnham Ct
Ste 350C
San Francisco, CA 94109
Phone (415) 771-6300

100 Pringle Ave
Ste 425
Walnut Creek, CA 94596
Phone (925) 932-3800

1166 Live Oak Blvd
Yuba City, CA 95991
Phone (530) 751-1500

510 S Cowley St
Spokane, WA 99202
Phone (509) 252-1299

Organizations & group practices 4

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.

NPI Registry JSON

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

{
    "created_epoch": "1523577600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1778112000000",
    "number": "1912494188",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "4000 HOLLYWOOD BLVD STE 215-A",
            "city": "HOLLYWOOD",
            "state": "FL",
            "postal_code": "330216751",
            "telephone_number": "954-988-0976"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "100 PRINGLE AVE STE 425",
            "city": "WALNUT CREEK",
            "state": "CA",
            "postal_code": "945967385",
            "telephone_number": "925-932-3800",
            "fax_number": "925-933-3339"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "1010 Kennedy Dr Ste 304",
            "address_purpose": "LOCATION",
            "city": "Key West",
            "state": "FL",
            "postal_code": "330404133",
            "country_code": "US",
            "telephone_number": "305-296-3334",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "5575 W Las Positas Blvd Ste 230",
            "address_purpose": "LOCATION",
            "city": "Pleasanton",
            "state": "CA",
            "postal_code": "945885802",
            "country_code": "US",
            "telephone_number": "925-416-1122",
            "fax_number": "925-416-2291",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "82883 Overseas Highway",
            "address_purpose": "LOCATION",
            "city": "Islamorada",
            "state": "FL",
            "postal_code": "33036",
            "country_code": "US",
            "telephone_number": "305-664-8898",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "ALTMANN",
        "first_name": "STEFANIE",
        "name_prefix": "Dr.",
        "credential": "DO",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2018-04-13",
        "last_updated": "2026-05-07",
        "certification_date": "2026-05-07",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207N00000X",
            "taxonomy_group": "",
            "desc": "Dermatology",
            "state": "FL",
            "license": "UO6375",
            "primary": false
        },
        {
            "code": "207N00000X",
            "taxonomy_group": "",
            "desc": "Dermatology",
            "state": "FL",
            "license": "OS18824",
            "primary": false
        },
        {
            "code": "207N00000X",
            "taxonomy_group": "",
            "desc": "Dermatology",
            "state": "CA",
            "license": "24681",
            "primary": false
        },
        {
            "code": "207ND0101X",
            "taxonomy_group": "",
            "desc": "Dermatology, MOHS-Micrographic Surgery",
            "state": "FL",
            "license": "OS18824",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "OR",
            "license": "PG188434",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Walnut Creek, CA

Sources for this page

Verify at the official NPI Registry.