Active NPI
John Martin II, MSW
- Clinical Social Worker
- Bethesda, MD
National Provider Identifier
1912666777
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Clinical Social Worker
- Practice address
- 4350 E West Hwy Ste 200
Bethesda, MD 20814-4426 - Phone
- (813) 957-0504
- NPI assigned
- Dec 9, 2021
- Last updated
- Jan 7, 2026
- 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 Social Worker | 1041C0700X | NU | Primary |
Addresses
Primary practice location
4350 E West Hwy Ste 200
Bethesda, MD 20814-4426
Mailing address
4350 E West Hwy Ste 200
Bethesda, MD 20814-4426
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Not listed in the public Medicare enrollment file
- Opted out of Medicare
- Yes, effective Jan 16, 2025 through Jan 16, 2027
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": "1639008000000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1767744000000",
"number": "1912666777",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "4350 E WEST HWY STE 200",
"city": "BETHESDA",
"state": "MD",
"postal_code": "208144426"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "4350 E WEST HWY STE 200",
"city": "BETHESDA",
"state": "MD",
"postal_code": "208144426",
"telephone_number": "813-957-0504"
}
],
"practiceLocations": [],
"basic": {
"last_name": "MARTIN",
"first_name": "JOHN",
"name_suffix": "II",
"credential": "MSW",
"sole_proprietor": "YES",
"sex": "M",
"enumeration_date": "2021-12-09",
"last_updated": "2026-01-07",
"certification_date": "2026-01-07",
"status": "A"
},
"taxonomies": [
{
"code": "1041C0700X",
"taxonomy_group": "",
"desc": "Social Worker, Clinical",
"state": "NU",
"license": null,
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Bethesda, MD
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jan 7, 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.