David Merens, MD
David Merens, MD is an Obstetrics & Gynecology Physician in Chelmsford, MA, registered under NPI 1831260348.
Getting there
The practice address on file is 228 BILLERICA RD, Chelmsford, MA 01824. 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 |
|---|---|---|
| 51371 | MA | Obstetrics & Gynecology Physician primary |
| MD17766 | RI | Obstetrics & Gynecology Physician |
Licences are recorded in 2 states: MA, RI. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
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.
Licensed in 2 states
This provider holds licences in 2 states: Massachusetts and Rhode Island. The practice address on file is in Chelmsford, MA, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
- Licence
- 51371
- Specialty
- Obstetrics & Gynecology Physician
- Licence
- MD17766
- Specialty
- Obstetrics & Gynecology Physician
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
What Obstetrics & Gynecology covers
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women. NUCC Health Care Provider Taxonomy, code 207V00000X
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 | |
|---|---|---|---|---|
| 207V00000X | Obstetrics & Gynecology Physician | 51371 | MA | primary |
| 207V00000X | Obstetrics & Gynecology Physician | MD17766 | RI |
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 | 1831260348 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Nov 13, 2006 |
| Last updated | Nov 23, 2021 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
228 BILLERICA RD Chelmsford, MA 01824 (666) 697-8250 Fax (978) 250-6200 |
| Mailing address |
147 MILK ST PROVIDER ENROLLMENT 9TH FLOOR Boston, MA 02109 |
| Other identifiers |
AA17612
· Other (MA) J02295 · Other (MA) 0765499 · Other (MA) 32330 · Other (MA) 2086735 · Medicaid (MA) 0002837 · Other (MA) 4196690 · Other (MA) 051371 · Other (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 | 8 | 3 | 1 | 2 | 6 | 0 | 3 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 8 | 6 | 1 | 4 | 6 | 0 | 3 | 8 |
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.