Active NPI
Paul T McMahon, PH.D.
- Clinical Psychologist
- Upland, CA
National Provider Identifier
1902139405
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Clinical Psychologist
- License
- PSY15721
- Practice address
- 820 N Mountain Ave
Upland, CA 91786-4111 - Phone
- (213) 700-9900
- NPI assigned
- Sep 15, 2009
- 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 | PSY15721 | CA | Primary |
Addresses
Primary practice location
820 N Mountain Ave
Upland, CA 91786-4111
Mailing address
2058 N Mills Ave
Claremont, CA 91711-2812
Phone (213) 700-9900
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Not listed in the public Medicare enrollment file
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
- Credentials
- Doctor of Philosophy
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| PSY15721 | CA | MD | Clinical Psychologist |
| 15721 | CA | MD | Physical Therapist |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1252972800000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1788307200000",
"number": "1902139405",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "2058 N MILLS AVE",
"city": "CLAREMONT",
"state": "CA",
"postal_code": "917112812",
"telephone_number": "213-700-9900"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "820 N MOUNTAIN AVE",
"city": "UPLAND",
"state": "CA",
"postal_code": "917864111",
"telephone_number": "213-700-9900"
}
],
"practiceLocations": [],
"basic": {
"last_name": "MCMAHON",
"first_name": "PAUL",
"middle_name": "T",
"credential": "PH.D.",
"sole_proprietor": "YES",
"sex": "M",
"enumeration_date": "2009-09-15",
"last_updated": "2026-09-02",
"certification_date": "2026-09-02",
"status": "A"
},
"taxonomies": [
{
"code": "103TC0700X",
"taxonomy_group": "",
"desc": "Psychologist, Clinical",
"state": "CA",
"license": "PSY15721",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Upland, CA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 2, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.