David Chad, MD
David Chad, MD is a Neurology Physician in Worcester, MA, registered under NPI 1477537520. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 55 LAKE AVE N DEPARTMENT OF NEUROLOGY, Worcester, MA 01655. 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 |
|---|---|---|
| 45515 | MA | Neurology Physician primary |
| 45515 | MA | Clinical Neurophysiology Physician |
| 45515 | MA | Internal Medicine Physician |
This provider holds licence 45515 issued in MA. 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 - Neurology
- PAC ID
- 7012927544
Medicare enrolment is recorded as approved under the provider type Practitioner - Neurology. 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 Neurology covers
A Neurologist specializes in the diagnosis and treatment of diseases or impaired function of the brain, spinal cord, peripheral nerves, muscles, autonomic nervous system, and blood vessels that relate to these structures. NUCC Health Care Provider Taxonomy, code 2084N0400X
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 | |
|---|---|---|---|---|
| 2084N0400X | Neurology Physician Neurology | 45515 | MA | primary |
| 2084N0600X | Clinical Neurophysiology Physician Clinical Neurophysiology | 45515 | MA | |
| 207R00000X | Internal Medicine Physician | 45515 | MA |
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 | 1477537520 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Dec 2, 2005 |
| Last updated | Aug 15, 2011 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
55 LAKE AVE N DEPARTMENT OF NEUROLOGY Worcester, MA 01655 (508) 856-2527 Fax (508) 856-6778 |
| Mailing address |
165 CAMBRIDGE ST 820 Boston, MA 02114 |
| Other identifiers |
0192589
(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 | 4 | 7 | 7 | 5 | 3 | 7 | 5 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 4 | 5 | 7 | 1 | 3 | 5 | 5 | 4 |
Sum = 60 · next multiple of 10 = 60 · check digit = 0 · actual last digit = 0
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.