Douglas Williamson, MD
Douglas Williamson, MD is a Pediatrics Physician in Lebanon, NH, registered under NPI 1265428221.
Getting there
The practice address on file is 5 ALICE PECK DAY DR, Lebanon, NH 03766. 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 |
|---|---|---|
| 9573 | NH | Pediatrics Physician primary |
This provider holds licence 9573 issued in NH. 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 Pediatrics covers
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development. NUCC Health Care Provider Taxonomy, code 208000000X
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 | 1265428221 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Sep 26, 2005 |
| Last updated | Apr 8, 2013 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
5 ALICE PECK DAY DR Lebanon, NH 03766 (603) 448-3122 Fax (603) 448-7491 |
| Mailing address |
10 ALICE PECK DAY DR Lebanon, NH 03766 |
| Other identifiers |
26P017
· MVP (NH) 30009508 (NH) 0104124YPNH01 · ANTHEM (NH) G27109 · HARVARD PILGRIM (NH) 00028912 · BC BS VT (VT) |
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 | 6 | 5 | 4 | 2 | 8 | 2 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 2 | 3 | 5 | 8 | 2 | 7 | 2 | 4 |
Sum = 59 · next multiple of 10 = 60 · check digit = 1 · actual last digit = 1
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.