Active NPI
Mark Dewitt Lanyon, PHD
- Addiction (Substance Use Disorder) Counselor
- Wilmington, DE
National Provider Identifier
1417008137
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Addiction (Substance Use Disorder) Counselor
- Practice address
- 2814 W 2ND St
Wilmington, DE 19805-1807 - Phone
- (302) 472-0381
- Fax
- (302) 472-0392
- NPI assigned
- Jan 16, 2007
- 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 2
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Cognitive & Behavioral Psychologist | 103TB0200X | |||
| Addiction (Substance Use Disorder) Counselor | 101YA0400X | Primary |
Addresses
Primary practice location
2814 W 2ND St
Wilmington, DE 19805-1807
Mailing address
2814 W 2ND St
Wilmington, DE 19805-1807
Phone (302) 472-0381
Other identifiers 2
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 1000024329 | Medicaid | DE | |
| PC002510 | Other | PA | PROF COUNSELOR LICENSE# |
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Not listed in the public Medicare enrollment file
- Eligible to order & refer
- Part B services: Yes
- Medical equipment: Yes
- Home health: No
- Power mobility devices: No
- Hospice: No
- Opted out of Medicare
- Yes, effective Jun 22, 2026 through Jun 22, 2028
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
- Credentials
- Doctor of Philosophy
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1168905600000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1757548800000",
"number": "1417008137",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "2814 W 2ND ST",
"city": "WILMINGTON",
"state": "DE",
"postal_code": "198051807",
"telephone_number": "302-472-0381",
"fax_number": "302-472-0392"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "2814 W 2ND ST",
"city": "WILMINGTON",
"state": "DE",
"postal_code": "198051807",
"telephone_number": "302-472-0381",
"fax_number": "302-472-0392"
}
],
"practiceLocations": [],
"basic": {
"last_name": "LANYON",
"first_name": "MARK",
"middle_name": "DEWITT",
"credential": "PHD",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2007-01-16",
"last_updated": "2025-09-11",
"status": "A"
},
"taxonomies": [
{
"code": "103TB0200X",
"taxonomy_group": "",
"desc": "Psychologist, Cognitive & Behavioral",
"state": null,
"license": null,
"primary": false
},
{
"code": "101YA0400X",
"taxonomy_group": "",
"desc": "Counselor, Addiction (Substance Use Disorder)",
"state": null,
"license": null,
"primary": true
}
],
"identifiers": [
{
"code": "05",
"desc": "MEDICAID",
"issuer": null,
"identifier": "1000024329",
"state": "DE"
},
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "PROF COUNSELOR LICENSE#",
"identifier": "PC002510",
"state": "PA"
}
],
"endpoints": [],
"other_names": []
}Other providers in Wilmington, DE
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 11, 2025; 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; Opt Out Affidavits.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.