Active NPI
Stephanie Messina, PA
- Physician Assistant
- San Francisco, CA
National Provider Identifier
1912202987
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Physician Assistant
- License
- PA21409
- Practice address
- 2340 Clay St FL 6
San Francisco, CA 94115-1932 - Phone
- (424) 444-7399
- Fax
- (424) 253-0814
- NPI assigned
- Jan 21, 2011
- Last updated
- Jun 30, 2026
- Sex
- Female
- Sole proprietor
- No
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 |
|---|---|---|---|---|
| Physician Assistant | 363A00000X | PA21409 | CA | Primary |
Addresses
Primary practice location
2340 Clay St FL 6
San Francisco, CA 94115-1932
Mailing address
2340 Clay St FL 6
San Francisco, CA 94115-1932
Phone (424) 444-7399
Other practice location 1
9834 Genesee Ave Ste 411
LA Jolla, CA 92037-1264
Phone (424) 444-7399
Other practice location 2
9025 Wilshire Blvd Ste 202
Beverly Hills, CA 90211-1825
Phone (424) 444-7399
Other practice location 3
2250 Hayes St
San Francisco, CA 94117-1078
Phone (424) 444-7399
Electronic endpoints 1
| Type | Endpoint | Use | Affiliation |
|---|---|---|---|
| Direct Messaging Address | stephanie@havenheadache.com |
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Enrolled in CA
- Eligible to order & refer
- Part B services: Yes
- Medical equipment: Yes
- Home health: Yes
- Power mobility devices: Yes
- Hospice: No
Enrollment records 1
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
- Credentials
- Physician Assistant
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 21409 | CA | MD | Occupational Therapist |
| PA21409 | CA | MD | Physician Assistant |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Cep America - Auc PC | Current | Accepting new patients | |
| Cep America - Auc, PC | Current | Accepting new patients | |
| Cep America - Auc, PC | Past | Accepting new patients | |
| St. Jude Hospital Yorba Linda | Past | Accepting new patients |
Locations
22855 Lake Forest Dr
Ste A
Lake Forest, CA 92630
Phone (949) 452-7544
26137 La Paz Rd
Ste 120
Mission Viejo, CA 92691
Phone (949) 452-3309
1601 Cummins Dr
Ste D
Modesto, CA 95358
Phone (510) 851-7423
Interoperability endpoints
- smessina1157225@oc.providencedirect.org
- stephanie.messina@908283864678404.direct.elationemr.com
- stephanie@havenheadache.com
Organizations & group practices 5
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.
-
- General Practice Physician
- Newport News, VA
- NPI 1104657329
-
dba Wellness-Jamboree Center
- Non-Pharmacy Dispensing Site
- Irvine, CA
- NPI 1306384185
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1295568000000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1782777600000",
"number": "1912202987",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "2340 CLAY ST FL 6",
"city": "SAN FRANCISCO",
"state": "CA",
"postal_code": "941151932",
"telephone_number": "424-444-7399",
"fax_number": "424-253-0814"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "2340 CLAY ST FL 6",
"city": "SAN FRANCISCO",
"state": "CA",
"postal_code": "941151932",
"telephone_number": "424-444-7399",
"fax_number": "424-253-0814"
}
],
"practiceLocations": [
{
"address_1": "9834 Genesee Ave Ste 411",
"address_purpose": "LOCATION",
"city": "LA Jolla",
"state": "CA",
"postal_code": "920371264",
"country_code": "US",
"telephone_number": "424-444-7399",
"fax_number": "424-253-0814",
"country_name": "United States",
"address_type": "DOM"
},
{
"address_1": "9025 Wilshire Blvd Ste 202",
"address_purpose": "LOCATION",
"city": "Beverly Hills",
"state": "CA",
"postal_code": "902111825",
"country_code": "US",
"telephone_number": "424-444-7399",
"fax_number": "424-253-0814",
"country_name": "United States",
"address_type": "DOM"
},
{
"address_1": "2250 Hayes St",
"address_purpose": "LOCATION",
"city": "San Francisco",
"state": "CA",
"postal_code": "941171078",
"country_code": "US",
"telephone_number": "424-444-7399",
"fax_number": "424-253-0814",
"country_name": "United States",
"address_type": "DOM"
}
],
"basic": {
"last_name": "MESSINA",
"first_name": "STEPHANIE",
"credential": "PA",
"sole_proprietor": "NO",
"sex": "F",
"enumeration_date": "2011-01-21",
"last_updated": "2026-06-30",
"certification_date": "2026-06-30",
"status": "A"
},
"taxonomies": [
{
"code": "363A00000X",
"taxonomy_group": "",
"desc": "Physician Assistant",
"state": "CA",
"license": "PA21409",
"primary": true
}
],
"identifiers": [],
"endpoints": [
{
"endpointType": "DIRECT",
"endpointTypeDescription": "Direct Messaging Address",
"endpoint": "stephanie@havenheadache.com",
"affiliation": "N",
"address_1": "2340 Clay St Fl 6",
"city": "San Francisco",
"state": "CA",
"country_code": "US",
"postal_code": "941151932",
"country_name": "United States",
"address_type": "DOM"
}
],
"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 Jun 30, 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.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.