Walter J. Alt, M.D.
Family Medicine Physician · Merrimac, MA
Walter J. Alt, M.D. is a family medicine physician with a practice address in Merrimac, Massachusetts, and NPI 1831147073, issued on May 4, 2006. Check the license (Massachusetts 81973, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Walter J. Alt
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 81973 MA
Self-reported in NPPES; status is on the state search - Practice location
- 5 East Main Street, Merrimac, MA 01860
- Phone
- (978) 346-9733
- Enumerated
- May 4, 2006
- Record last updated
- Dec 13, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicaid ID
- 110056507A MA
- Entity
- Type 1 · individual
Verify Walter J. Alt in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 81973Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3 family medicine physician records list a practice address in Merrimac
They are 3 of the 46 NPPES records with a practice address in Merrimac, and 2,265 family medicine physician records in Massachusetts. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 3 in Merrimac → All 2,265 in Massachusetts → Every provider in Merrimac →
Other family medicine physician records in Massachusetts
- Salah Abass, M.D.Methuen, MA1417959776
- Majed Abbas, MDLowell, MA1346827870
- Sheila Abdallah, MDWorcester, MA1821356312
- Omar Abduljabar, M.D.Springfield, MA1770978843
- Jonathan Abel, DOSpringfield, MA1700897196
- Mohamed Abib, MDSturbridge, MA1639281090
- Kevin Abraham, M.D.Worcester, MA1689037673
- Janet Abrahamian, M.D.West Boylston, MA1932156627
- John Abramson, M.D.Ipswich, MA1275613903
- John Paul Abroguena, MDPlainville, MA1235361080
Common questions
What is Walter J. Alt, M.D.'s NPI number?
Walter J. Alt, M.D.'s National Provider Identifier (NPI) is 1831147073, issued on May 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Walter J. Alt, M.D. located?
The NPPES record lists a practice address at 5 East Main Street, Merrimac, MA, 01860. Phone: (978) 346-9733. Providers update this record themselves, so call before visiting.
How can I verify Walter J. Alt, M.D.'s license?
NPPES lists Massachusetts license number 81973, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. 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.
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.