Active NPI
Merrill M Knopf, M.D.
- Ophthalmology Physician
- Long Beach, CA
National Provider Identifier
1841294733
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Ophthalmology Physician
- License
- G16139
- Practice address
- 1045 Atlantic Ave
Ste 1007
Long Beach, CA 90813-3413 - Phone
- (562) 436-4558
- Fax
- (562) 437-4558
- NPI assigned
- Jun 8, 2005
- Sex
- Male
- 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 |
|---|---|---|---|---|
| Ophthalmology Physician | 207W00000X | G16139 | CA | Primary |
Addresses
Primary practice location
1045 Atlantic Ave
Ste 1007
Long Beach, CA 90813-3413
Mailing address
1045 Atlantic Ave
Ste 1007
Long Beach, CA 90813-3413
Phone (562) 436-4558
Other identifiers 1
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 00G161390 | Medicaid | CA |
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 Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 16139 | CA | MD | Marriage & Family Therapist |
| G16139 | CA | MD | Ophthalmology Physician |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1118188800000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1783900800000",
"number": "1841294733",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "1045 ATLANTIC AVE",
"address_2": "STE 1007",
"city": "LONG BEACH",
"state": "CA",
"postal_code": "908133413",
"telephone_number": "562-436-4558",
"fax_number": "562-437-4558"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "1045 ATLANTIC AVE",
"address_2": "STE 1007",
"city": "LONG BEACH",
"state": "CA",
"postal_code": "908133413",
"telephone_number": "562-436-4558",
"fax_number": "562-437-4558"
}
],
"practiceLocations": [],
"basic": {
"last_name": "KNOPF",
"first_name": "MERRILL",
"middle_name": "M",
"credential": "M.D.",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2005-06-08",
"last_updated": "2026-07-13",
"status": "A"
},
"taxonomies": [
{
"code": "207W00000X",
"taxonomy_group": "",
"desc": "Ophthalmology",
"state": "CA",
"license": "G16139",
"primary": true
}
],
"identifiers": [
{
"code": "05",
"desc": "MEDICAID",
"issuer": null,
"identifier": "00G161390",
"state": "CA"
}
],
"endpoints": [],
"other_names": []
}Other providers in Long Beach, CA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 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.