John Chiosi, M.D.
Infectious Disease Physician · Boston, MA
John Chiosi, M.D. is an infectious disease physician with a practice address in Boston, Massachusetts, and NPI 1306231097, issued on Mar 31, 2015. Check the license (Massachusetts 279009, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- John Chiosi
- Credential
- M.D.
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- 279009 MA
Self-reported in NPPES; status is on the state search - Practice location
- 55 Fruit St., Boston, MA 02114
- Phone
- (617) 726-3906
- Enumerated
- Mar 31, 2015
- Record last updated
- Jun 1, 2023
- Fax
- (617) 726-7653
- Medicare enrollment
- Enrolled (PECOS I20210721003052); accepts Medicare assignment
- Medical or professional school
- Icahn School Of Medicine At Mount Sinai, 2015
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 487 in Massachusetts → Look up another NPI →
Also registered at 55 Fruit St.
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John Chiosi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 279009Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% fewer Medicare Part D claims than the average infectious disease physician in 2024
87 Medicare Part D claims for 17 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D. Brand-name drugs were 29% of 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.
Bills Medicare through 4 group practices
- Mass General Brigham Medical Group Suburban Massachusetts IncNewton, MA
- Mass General Brigham Medical Group Western Massachusetts IncNorthampton, MA
- Massachusetts General Physicians Organization IncBoston, MA
- The General Hospital CorporationBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Chiosi among 487 infectious disease physician records in Massachusetts
John Chiosi, M.D. is one of 487 infectious disease physician records with a practice address in Massachusetts. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 84% of them.
- NPI issued2015 · 84% of these records are older, 14% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileYes · 61% of these records are
- Graduated2015 · median 2003 among the 296 with a school on file
- Record last updated2023 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in Massachusetts
There are 487 infectious disease physician records in Massachusetts.
All 487 in Massachusetts → Every provider in Boston → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Diana Brainard, MDBoston, MA 021141093705667
- Joan Butterton, MDBoston, MA 021141043200157
- Benjamin Davis, MDBoston, MA 021141912997537
- Marlene Durand, MDBoston, MA 021141598756058
- Jay Fishman, MDBoston, MA 021141912988106
- Marcia Goldberg, MDBoston, MA 021141700877834
- Deborah Hung, MDBoston, MA 021141629068267
- Sabina Islam, MDBoston, MA 021141275514390
Common questions
What is John Chiosi, M.D.'s NPI number?
John Chiosi, M.D.'s National Provider Identifier (NPI) is 1306231097, issued on Mar 31, 2015. An NPI identifies a provider in billing; it is not a license.
Where is John Chiosi, M.D. located?
The NPPES record lists a practice address at 55 Fruit St., Boston, MA, 02114. Phone: (617) 726-3906. Providers update this record themselves, so call before visiting.
How can I verify John Chiosi, M.D.'s license?
NPPES lists Massachusetts license number 279009, 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 Chiosi, M.D. prescribe under Medicare Part D?
In 2024, John Chiosi, M.D. had 87 Medicare Part D claims for 17 beneficiaries; the average among infectious disease physician prescribers was 689. 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.