Gerald O'brien, MD
Gerald O'brien, MD is a Pulmonary Disease Physician in Newark, DE, registered under NPI 1215980313.
Getting there
The practice address on file is 4745 OGLETOWN STANTON RD SUITE 220, Newark, DE 19713. 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 |
|---|---|---|
| C10006061 | DE | Pulmonary Disease Physician primary |
This provider holds licence C10006061 issued in DE. 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 Pulmonary Disease covers
An internist who treats diseases of the lungs and airways. The pulmonologist diagnoses and treats cancer, pneumonia, pleurisy, asthma, occupational and environmental diseases, bronchitis, sleep disorders, emphysema and other complex disorders of the lungs. NUCC Health Care Provider Taxonomy, code 207RP1001X
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 | 1215980313 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | May 18, 2006 |
| Last updated | Sep 2, 2010 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
4745 OGLETOWN STANTON RD SUITE 220 Newark, DE 19713 (302) 368-5515 Fax (302) 366-1240 |
| Other identifiers |
0906208002
· CIGNA 290754 · MAMSI 1356478 · INDEPENDENCE BCBS 0000685101 (DE) 60959301 · CAREFIRST BCBS (MD) 0000658101 (DE) 105619 · COVENTRY 2049044000 · AMERIHEALTH/KEYSTONE 4618046 · AETNA/USHC |
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 | 1 | 5 | 9 | 8 | 0 | 3 | 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 2 | 2 | 5 | 9 | 8 | 0 | 3 | 2 |
Sum = 57 · next multiple of 10 = 60 · check digit = 3 · actual last digit = 3
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.