James Katz, M.D.
Occupational Medicine Physician · Boston, MA
James Katz, M.D. is an occupational medicine physician with a practice address in Boston, Massachusetts, and NPI 1164540662, issued on Mar 26, 2007. Check the license (Massachusetts 44435, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- James Katz
- Credential
- M.D.
- Primary taxonomy
- Occupational Medicine Physician 2083X0100X
- License number
- 44435 MA
Self-reported in NPPES; status is on the state search - Practice location
- 20 Park Plz, Boston, MA 02116
- Phone
- (978) 888-7999
- Enumerated
- Mar 26, 2007
- Record last updated
- Dec 14, 2013 (not updated in 13 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest occupational medicine physician records → All 54 in Massachusetts → Look up another NPI →
Also registered at 20 Park Plz
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Edwin Holstein, M.D.Occupational Medicine Physician1679646814
- John HurleyCognitive & Behavioral Psychologist1538210489
- Sean Kelly, PH.DClinical Psychologist1215081526
- Katherine Lantsman, M.D.Internal Medicine Physician1720052475
- Charles Martel, L.I.C.S.W.Clinical Social Worker1881690014
Verify James Katz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 44435Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
80% fewer Medicare Part D claims than the average occupational medicine physician in 2024
161 Medicare Part D claims for 13 beneficiaries, against an average of 794 among the 463 providers of this specialty who prescribed in Part D.
Most prescribed
- Testosterone Cypionate23 claims
- Pravastatin Sodium16 claims
- Zolpidem Tartrate15 claims
- Sildenafil Citrate12 claims
- Cyanocobalamin Injection11 claims
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.
James Katz among 54 occupational medicine physician records in Massachusetts
James Katz, M.D. is one of 54 occupational medicine physician records with a practice address in Massachusetts. 26% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 59% of them.
- NPI issued2007 · 59% of these records are older, 15% newer
- In a Medicare fileYes · 26% of these records are
- In the CMS Doctors and Clinicians fileNo · 6% of these records are
- Record last updated2013 · 74% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2083X0100X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Occupational Medicine Physician providers in Massachusetts
There are 54 occupational medicine physician records in Massachusetts.
All 54 in Massachusetts → Every provider in Boston → Occupational Medicine Physician nationwide →
The 8 occupational medicine physician records with the nearest ZIP codes
- Edwin Holstein, M.D.Boston, MA 021161679646814
- Karl Kelsey, MDBoston, MA 021151588772818
- Stasia Muhlner, M.D., M.P.H.Boston, MA 021151639488497
- Dean Hashimoto, MDBoston, MA 021141306837802
- Robert McCunney, MDBoston, MA 021141750364535
- Alan Rodgers, MDBoston, MA 021181043244791
- Frances S.m. Yee, M.D.Boston, MA 021081568652600
- Alan Sooho, M.D.Boston, MA 021301891744793
Common questions
What is James Katz, M.D.'s NPI number?
James Katz, M.D.'s National Provider Identifier (NPI) is 1164540662, issued on Mar 26, 2007. An NPI identifies a provider in billing; it is not a license.
Where is James Katz, M.D. located?
The NPPES record lists a practice address at 20 Park Plz, Boston, MA, 02116. Phone: (978) 888-7999. Providers update this record themselves, so call before visiting.
How can I verify James Katz, M.D.'s license?
NPPES lists Massachusetts license number 44435, 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 James Katz, M.D. prescribe under Medicare Part D?
In 2024, James Katz, M.D. had 161 Medicare Part D claims for 13 beneficiaries; the average among occupational medicine physician prescribers was 794. 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.