Active NPI
Colin Holtzinger, PSYD
- Clinical Psychologist
- San Francisco, CA
National Provider Identifier
1437630803
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Clinical Psychologist
- License
- PSY34174
- Practice address
- 2383 California St Ste 3
San Francisco, CA 94115-2750 - Phone
- (415) 286-5258
- NPI assigned
- Aug 23, 2018
- Sex
- Male
- Sole proprietor
- Yes
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Specialties & licenses 1
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Clinical Psychologist | 103TC0700X | PSY34174 | CA | Primary |
Addresses
Primary practice location
2383 California St Ste 3
San Francisco, CA 94115-2750
Mailing address
2383 California St Ste 3
San Francisco, CA 94115-2750
Phone (415) 286-5258
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Not listed in the public Medicare enrollment file
- Opted out of Medicare
- Yes, effective Mar 25, 2024 through Mar 25, 2028
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Not enrolled
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1534982400000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1783728000000",
"number": "1437630803",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "2383 CALIFORNIA ST STE 3",
"city": "SAN FRANCISCO",
"state": "CA",
"postal_code": "941152750",
"telephone_number": "415-286-5258"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "2383 CALIFORNIA ST STE 3",
"city": "SAN FRANCISCO",
"state": "CA",
"postal_code": "941152750",
"telephone_number": "415-286-5258"
}
],
"practiceLocations": [],
"basic": {
"last_name": "HOLTZINGER",
"first_name": "COLIN",
"credential": "PSYD",
"sole_proprietor": "YES",
"sex": "M",
"enumeration_date": "2018-08-23",
"last_updated": "2026-07-11",
"certification_date": "2026-07-11",
"status": "A"
},
"taxonomies": [
{
"code": "103TC0700X",
"taxonomy_group": "",
"desc": "Psychologist, Clinical",
"state": "CA",
"license": "PSY34174",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in San Francisco, CA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 11, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Opt Out Affidavits.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.