Mary Harrington, LCSW
Mary Harrington, LCSW is an Addiction (Substance Use Disorder) Counselor in Irvington, NY, registered under NPI 1124004254. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
The practice address on file is 1 BRIDGE ST SUITE 22, Irvington, NY 10533. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| R055967 | NY | Addiction (Substance Use Disorder)… primary |
| R055967 | NY | Clinical Social Worker |
| R055967 | NY | Marriage & Family Therapist |
This provider holds licence R055967 issued in NY. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Clinical Social Worker
- PAC ID
- 1850305699
Medicare enrolment is recorded as approved under the provider type Practitioner - Clinical Social Worker. This means the provider is enrolled to bill Medicare, though it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Addiction (Substance Use Disorder) covers
Definition to come... NUCC Health Care Provider Taxonomy, code 101YA0400X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 101YA0400X | Addiction (Substance Use Disorder) Counselor Addiction (Substance Use Disorder) | R055967 | NY | primary |
| 1041C0700X | Clinical Social Worker Clinical | R055967 | NY | |
| 106H00000X | Marriage & Family Therapist | R055967 | NY |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1124004254 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Dec 20, 2005 |
| Last updated | Sep 11, 2025 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | LCSW |
| Practice address |
1 BRIDGE ST SUITE 22 Irvington, NY 10533 (914) 589-3293 Fax (914) 667-1494 |
| Other identifiers |
02753280
(NY) 789463 · AETNA (NY) P3663895 · OXFORD (NY) |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 1 | 2 | 4 | 0 | 0 | 4 | 2 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 1 | 4 | 4 | 0 | 0 | 8 | 2 | 1 |
Sum = 46 · next multiple of 10 = 50 · check digit = 4 · actual last digit = 4
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.