Active NPI
Matthew Eldon Riehm
- Counselor
- Los Alamitos, CA
National Provider Identifier
1629941695
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Counselor
- License
- 210088447
- Practice address
- 3591 Cerritos Ave
Los Alamitos, CA 90720-2414 - Phone
- (562) 799-4780
- Fax
- (562) 799-4798
- NPI assigned
- Sep 25, 2025
- 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 |
|---|---|---|---|---|
| Counselor | 101Y00000X | 210088447 | CA | Primary |
Addresses
Primary practice location
3591 Cerritos Ave
Los Alamitos, CA 90720-2414
Mailing address
8392 Malloy Dr
Huntington Beach, CA 92646-5039
Phone (562) 799-4780
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)
- Not enrolled
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 210088447 | CA | MD | Counselor |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1758758400000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1758758400000",
"number": "1629941695",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "8392 MALLOY DR",
"city": "HUNTINGTON BEACH",
"state": "CA",
"postal_code": "926465039",
"telephone_number": "562-799-4780",
"fax_number": "562-799-4798"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "3591 CERRITOS AVE",
"city": "LOS ALAMITOS",
"state": "CA",
"postal_code": "907202414",
"telephone_number": "562-799-4780",
"fax_number": "562-799-4798"
}
],
"practiceLocations": [],
"basic": {
"last_name": "RIEHM",
"first_name": "MATTHEW",
"middle_name": "ELDON",
"name_prefix": "Mr.",
"sole_proprietor": "YES",
"sex": "M",
"enumeration_date": "2025-09-25",
"last_updated": "2025-09-25",
"certification_date": "2025-09-25",
"status": "A"
},
"taxonomies": [
{
"code": "101Y00000X",
"taxonomy_group": "",
"desc": "Counselor",
"state": "CA",
"license": "210088447",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Los Alamitos, CA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 25, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.