Active NPI
Stefanie Altmann, DO
- Internal Medicine Physician
- Walnut Creek, CA
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Internal Medicine Physician
- License
- PG188434
- 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, 2026
- Sex
- Female
- Sole proprietor
- Yes
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Specialties & licenses 5
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| 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, CA
- Eligible to order & refer
- Part B services: Yes
- Medical equipment: Yes
- Home health: Yes
- Power mobility devices: Yes
- Hospice: Yes
Enrollment records 2
Care Compare profile
Medicare Care Compare- Specialty
- Dermatology
- Education
- Other, 2018
- Medicare assignment
- Accepts the Medicare-approved amount as payment in full
- Group practices
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 100
- Promoting interoperability
- 100
- Improvement activities
- 40
Procedures performed for Medicare patients
| Procedure | Number of procedures |
|---|---|
| Melanoma (skin cancer) excision | 67 |
| Removal of tissue | 1-10 |
| Removal of skin lesions | 283 |
| Removal of skin cancer | 298 |
| Removal or shaving of skin growth | 1-10 |
| Skin biopsy | 136 |
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
- Credentials
- Doctor of Osteopathy
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| UO6375 | FL | MD | Dermatology Physician |
| PG188434 | OR | MD | Internal Medicine Physician |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Chesnut MD | Dermatology | Current | Accepting new patients |
| Berman Skin Institute Medical Group Inc | Dermatology | Current | Accepting new patients |
| Jill E. Stocker, D.O. PC | Past | Accepting new patients | |
| University Dermatopathology Services Inc | Past | 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.
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- Dermatology Physician
- Spokane, WA
- NPI 1437798568
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- Family Medicine Physician
- Yuba City, CA
- NPI 1043408693
-
- Dermatopathology (Pathology) Physician
- Burbank, CA
- NPI 1376062141
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
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 7, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
- Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.