Jon W. Cronin, M.D.
Internal Medicine Physician · Milton, MA
Jon W. Cronin, M.D. is an internal medicine physician with a practice address in Milton, Massachusetts, and NPI 1326085523, issued on May 31, 2006. Check the license (Massachusetts 50231, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Jon W. Cronin
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 50231 MA
Self-reported in NPPES; status is on the state search - Practice location
- 100 Highland Street, Milton, MA 02186
- Phone
- (617) 698-8855
- Enumerated
- May 31, 2006
- Record last updated
- Jul 13, 2026
- Medicare enrollment
- Enrolled (PECOS I20050330000602); accepts Medicare assignment
- Medical or professional school
- University Of Massachusetts Medical School, 1981
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 100 Highland Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Donna Cullinan, NPNurse Practitioner1407076417
- Guy Rochman, MDSpecialist1669453361
- Geoffrey Wickwire, M.D.Internal Medicine Physician1710924915
Verify Jon W. Cronin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 50231Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.7 times the Medicare Part D claims of the average internal medicine physician in 2024
8,653 Medicare Part D claims for 652 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 97 claims were for opioids.
Most prescribed
- Atorvastatin Calcium890 claims
- Amlodipine Besylate707 claims
- Metoprolol Succinate685 claims
- Eliquis554 claims
- Lisinopril448 claims
- Rosuvastatin Calcium286 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.
Industry payments in 2024: $384.80
16 payments; by number, the most common kind was food and beverage; the largest payer was Pfizer Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Milton Cardiac Testing, P.C.Milton, MA
- South Shore Internal Medicine Associates Inc.Milton, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jon W. Cronin among 6,825 internal medicine physician records in Massachusetts
Jon W. Cronin, M.D. is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 12% of them.
- NPI issued2006 · 12% of these records are older, 54% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1981 · median 2004 among the 4,103 with a school on file
- Record last updated2026 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
15 internal medicine physician records list a practice address in Milton
They are 15 of the 445 NPPES records with a practice address in Milton, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Milton → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Mary Ashur, M.D.Milton, MA 021861033109343
- John Barravecchio, M.D.Milton, MA 021861801997564
- Michele Chabot, MDMilton, MA 021861629062781
- Daniel Driscoll, M.D.Milton, MA 021861942290853
- John Ferrante, M.D.Milton, MA 021861649269523
- Richard Florentine, MDMilton, MA 021861609826676
- Kenneth Harris, M.D.Milton, MA 021861790710887
- John Joseph Looney, M.D.Milton, MA 021861003848532
Common questions
What is Jon W. Cronin, M.D.'s NPI number?
Jon W. Cronin, M.D.'s National Provider Identifier (NPI) is 1326085523, issued on May 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jon W. Cronin, M.D. located?
The NPPES record lists a practice address at 100 Highland Street, Milton, MA, 02186. Phone: (617) 698-8855. Providers update this record themselves, so call before visiting.
How can I verify Jon W. Cronin, M.D.'s license?
NPPES lists Massachusetts license number 50231, 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 Jon W. Cronin, M.D. prescribe under Medicare Part D?
In 2024, Jon W. Cronin, M.D. had 8,653 Medicare Part D claims for 652 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.