NPPES file of Aug 9, 2026

William Stewart Blackwood, M.D.

Family Medicine Physician · Merrimack, NH

William Stewart Blackwood, M.D. is a family medicine physician with a practice address in Merrimack, New Hampshire, and NPI 1346226107, issued on Dec 22, 2005. Check the license (New Hampshire 5860, as entered in NPPES) on the New Hampshire Board of Medicine; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1346226107
Name
William Stewart Blackwood
Credential
M.D.
Primary taxonomy
Family Medicine Physician 207Q00000X
License number
5860 NH
Self-reported in NPPES; status is on the state search
Practice location
382 Daniel Webster Hwy, Merrimack, NH 03054
Phone
(603) 424-4181
Enumerated
Dec 22, 2005
Record last updated
Jul 25, 2007 (not updated in 19 years: call before relying on the address or phone)
Medicaid ID
30005635 NH
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest family medicine physician records → All 816 in New Hampshire → Look up another NPI →

Also registered at 382 Daniel Webster Hwy

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Judith Corbit, ARNPFamily Nurse Practitioner1275511800
  2. Holly Drexler, M.D.Family Medicine Physician1790761542
  3. John Jackson, DMDEndodontics1801007919

Verify William Stewart Blackwood in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersNew Hampshire Board of Medicine
    Search for license 5860    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the New Hampshire license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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William Stewart Blackwood among 816 family medicine physician records in New Hampshire

William Stewart Blackwood, M.D. is one of 816 family medicine physician records with a practice address in New Hampshire. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2005, is newer than 0% of them.

  • NPI issued2005 · 0% of these records are older, 87% newer
  • In a Medicare fileNo · 74% of these records are
  • In the CMS Doctors and Clinicians fileNo · 61% of these records are
  • Record last updated2007 · 62% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a New Hampshire practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

16 family medicine physician records list a practice address in Merrimack

They are 16 of the 270 NPPES records with a practice address in Merrimack, and 816 family medicine physician records in New Hampshire. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 816 in New Hampshire → Every provider in Merrimack → Family Medicine Physician nationwide →

The 8 family medicine physician records with the nearest ZIP codes

  1. Thomas Astolfi, M.DMerrimack, NH 030541689650665
  2. Archie Dickinson, MDMerrimack, NH 030541518143650
  3. Holly Drexler, M.D.Merrimack, NH 030541790761542
  4. Debra Garlin, DOMerrimack, NH 030541679537690
  5. Edward Hall, M.D.Merrimack, NH 030541083622674
  6. Ewa Jankowska, MDMerrimack, NH 030541659682961
  7. Nicola Kernan, M.D.Merrimack, NH 030541093791832
  8. Mary Merkel, D.O.Merrimack, NH 030541558375709

Common questions

What is William Stewart Blackwood, M.D.'s NPI number?

William Stewart Blackwood, M.D.'s National Provider Identifier (NPI) is 1346226107, issued on Dec 22, 2005. An NPI identifies a provider in billing; it is not a license.

Where is William Stewart Blackwood, M.D. located?

The NPPES record lists a practice address at 382 Daniel Webster Hwy, Merrimack, NH, 03054. Phone: (603) 424-4181. Providers update this record themselves, so call before visiting.

How can I verify William Stewart Blackwood, M.D.'s license?

NPPES lists New Hampshire license number 5860, as entered by the provider. Search the New Hampshire Board of Medicine at https://www.oplc.nh.gov/board-medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.