Sarah Duggan
Sarah Duggan is an Addiction (Substance Use Disorder) Counselor in Waltham, MA, registered under NPI 1255666947. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 20 HIGH ST STE 1, Waltham, MA 02453. 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
NPPES does not list a state licence number for this record. That is not unusual — organizations and some provider types are not required to file one. Verify current licensure with the relevant state board before care.
- Status
- Approved
- Provider type
- Practitioner - Clinical Social Worker
- PAC ID
- 1153736301
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 2 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) | — | — | primary |
| 101YM0800X | Mental Health Counselor Mental Health | — | — |
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 | 1255666947 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Oct 14, 2009 |
| Last updated | Apr 2, 2025 |
| Status | Active |
| Sole proprietor | No |
| Practice address |
20 HIGH ST STE 1 Waltham, MA 02453 (781) 242-2200 |
| Mailing address |
995 WORTHINGTON ST Springfield, MA 01109 |
| Other identifiers |
1004745
· NHP (MA) 1303287 (MA) M18684 · BLUE CROSS (MA) NP01332 · BMC (MA) 1306421 (MA) M18633 · BLUE CROSS (MA) |
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 | 2 | 5 | 5 | 6 | 6 | 6 | 9 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 2 | 1 | 5 | 3 | 6 | 3 | 9 | 8 |
Sum = 63 · next multiple of 10 = 70 · check digit = 7 · actual last digit = 7
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.