Mark Breen
Mark Breen is a Specialist in Lowell, MA, registered under NPI 1003483678.
Getting there
Here is what surrounds this office in Lowell, based on OpenStreetMap data collected Sep 30, 2026. Parking is available about 0.48 mi away. The nearest transit stop is 0.44 mi away, served by Hannaford.
Getting here and what is nearby
Transit Sunrise Plaza 208 ft ~1 min
Restaurant McDonald's 239 ft ~1 min
1260 Bridge Street, Dracut 01826
Su-Tu 06:00-01:00; We-Sa 06:00-04:00
Restaurant Burger King 276 ft ~2 min
Restaurant The Pizza Club 532 ft ~3 min
Grocery Market Basket 508 ft ~2 min
Transit Willard St and Humphrey St 980 ft ~4 min
Parking 0.35 mi ~8 min
Parking 0.38 mi ~8 min
Grocery Hannaford 0.41 mi ~9 min
301 Pleasant Street, 01826
Mo-Sa 07:00-22:00; Su 07:00-21:00
Transit Hannaford 0.44 mi ~9 min
Parking 0.48 mi ~10 min
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
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.
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 Specialist covers
An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree. NUCC Health Care Provider Taxonomy, code 174400000X
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 | 1003483678 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 10, 2021 |
| Last updated | Jun 10, 2021 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Practice address |
1230 BRIDGE ST Lowell, MA 01850 (978) 455-3397 |
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 | 4 | 8 | 3 | 6 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 8 | 8 | 6 | 6 | 5 |
Sum = 62 · next multiple of 10 = 70 · check digit = 8 · actual last digit = 8
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.