Theodore Wasik, MD
Theodore Wasik, MD is a Psychiatry Physician in Lexington, MA, registered under NPI 1003025776. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in Lexington, based on OpenStreetMap data collected Aug 30, 2026. Parking is available about 179 ft away. The nearest transit stop is 207 ft away, served by Town Hall. A pharmacy sits 968 ft from the entrance (Theater Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 846 ft away.
Getting here and what is nearby
Transit 1666 Massachusetts Ave 67 ft ~1 min
Transit Massachusetts Ave @ Lexington Post Office 77 ft ~1 min
Parking 106 ft ~1 min
Parking 175 ft ~1 min
Parking 179 ft ~1 min
Transit Town Hall 207 ft ~1 min
Restaurant Clay Oven 208 ft ~1 min
1666 Massachusetts Avenue, Lexington 02420
Mo-Fr 16:00-21:00; Sa-Su 11:30-21:00
Restaurant Inspire Bowl n' Tea 396 ft ~2 min
1686 Massachusetts Avenue, Lexington 02420
Mo-Fr 10:00-18:00; Sa-Su 09:00-18:00
Restaurant Love at First Bite 463 ft ~2 min
Coffee Revival Cafe 635 ft ~3 min
1729 Massachusetts Avenue, Lexington 02420
Pharmacy CVS Pharmacy 680 ft ~3 min
Coffee Peet's Coffee 720 ft ~3 min
1749 Massachusetts Avenue, Lexington 02420
Mo-Fr 06:00-18:00; Sa-Su 07:00-18:00
Coffee CoCo Fresh Tea & Juice 846 ft ~4 min
Pharmacy Theater Pharmacy 968 ft ~4 min
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 243789 | MA | Psychiatry Physician primary |
This provider holds licence 243789 issued in MA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Psychiatry covers
A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems. NUCC Health Care Provider Taxonomy, code 2084P0800X
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 | 1003025776 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | May 21, 2007 |
| Last updated | Apr 24, 2025 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | MD |
| Practice address |
1632 MASSACHUSETTS AVE Lexington, MA 02420 (617) 470-1805 Fax (781) 496-1042 |
| Mailing address |
8 AYER RD Harvard, MA 01451 |
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 | 0 | 0 | 3 | 0 | 2 | 5 | 7 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 2 | 1 | 7 | 5 |
Sum = 44 · next multiple of 10 = 50 · check digit = 6 · actual last digit = 6
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.