John A. Holbrook, M.D.
Emergency Medicine Physician · Hadley, MA
John A. Holbrook, M.D. is an emergency medicine physician with a practice address in Hadley, Massachusetts, and NPI 1093875593, issued on Dec 12, 2006. Check the license (Massachusetts 40494, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- John A. Holbrook
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 40494 MA
Self-reported in NPPES; status is on the state search - Practice location
- 5 West St, Hadley, MA 01035
- Phone
- (413) 237-1161
- Enumerated
- Dec 12, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
Also registered at 5 West St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Susan Brennan, CCC-SLPSpeech-Language Pathologist1770979197
Verify John A. Holbrook in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 40494Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average emergency medicine physician in 2024
22 Medicare Part D claims, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
2 emergency medicine physician records list a practice address in Hadley
They are 2 of the 164 NPPES records with a practice address in Hadley, and 1,829 emergency medicine physician records in Massachusetts.
All 2 in Hadley → All 1,829 in Massachusetts → Every provider in Hadley →
Other emergency medicine physician records in Massachusetts
- Emily Aaronson, M.D.Boston, MA1962791558
- Sharif Abdel Jalil, PHARM. D., MDWorcester, MA1649795758
- Menahem Abraham, M.D.Beverly, MA1720113889
- Aser AbrhaBoston, MA1568102796
- Jorge Acevedo Herman, MDWorcester, MA1447955000
- Matthew Adamo, DOFalmouth, MA1912446972
- Austin AdamsBoston, MA1861139388
- Sapana Adhikari, M.D.Boston, MA1902870694
- Jamie Adler, MDBoston, MA1659765790
- Jonathan Adler, MDBoston, MA1609851500
Common questions
What is John A. Holbrook, M.D.'s NPI number?
John A. Holbrook, M.D.'s National Provider Identifier (NPI) is 1093875593, issued on Dec 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John A. Holbrook, M.D. located?
The NPPES record lists a practice address at 5 West St, Hadley, MA, 01035. Phone: (413) 237-1161. Providers update this record themselves, so call before visiting.
How can I verify John A. Holbrook, M.D.'s license?
NPPES lists Massachusetts license number 40494, 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.
How much does John A. Holbrook, M.D. prescribe under Medicare Part D?
In 2024, John A. Holbrook, M.D. had 22 Medicare Part D claims; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. 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.