John Charles Mazzocco, MD
Orthopaedic Surgery Physician · Boston, MA
John Charles Mazzocco, MD is an orthopaedic surgery physician with a practice address in Boston, Massachusetts, and NPI 1386266831, issued on May 7, 2020. Check the license (Massachusetts 293174, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- John Charles Mazzocco
- Credential
- MD
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License number
- 293174 MA
Self-reported in NPPES; status is on the state search - Practice location
- 800 Washington St, Boston, MA 02111
- Phone
- (617) 636-5172
- Enumerated
- May 7, 2020
- Record last updated
- Jun 21, 2022
- Fax
- (617) 636-5178
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 692 in Massachusetts → Look up another NPI →
Also registered at 800 Washington St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jeffrey Aalberg, MD, MPHSurgery Physician1326788027
- Omer Abbak, PHARMDPharmacist1114500337
- Aya Abdelnaser, MDStudent in an Organized Health Care Education/Training Program1770425373
- Marie Elise Abi Antoun, MDObstetrics & Gynecology Physician1356042626
- Ahmad AboalfarajSurgery Physician1538517651
- Tala Abu Samaan, MDStudent in an Organized Health Care Education/Training Program1376386250
Verify John Charles Mazzocco in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 293174Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average orthopaedic surgery physician in 2024
24 Medicare Part D claims for 18 beneficiaries, against an average of 346 among the 16,516 providers of this specialty who prescribed in Part D. 15 claims were for opioids.
Most prescribed
- Oxycodone Hcl11 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: $122.11
4 payments; by number, the most common kind was food and beverage; the largest payer was Stryker Corporation. The 15,003 providers of this specialty with any payment received $23,022.89 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.
John Charles Mazzocco among 692 orthopaedic surgery physician records in Massachusetts
John Charles Mazzocco, MD is one of 692 orthopaedic surgery physician records with a practice address in Massachusetts. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 88% of them.
- NPI issued2020 · 88% of these records are older, 7% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileNo · 64% of these records are
- Record last updated2022 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207X00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Orthopaedic Surgery Physician providers in Massachusetts
There are 692 orthopaedic surgery physician records in Massachusetts.
All 692 in Massachusetts → Every provider in Boston → Orthopaedic Surgery Physician nationwide →
The 8 orthopaedic surgery physician records with the nearest ZIP codes
- Asad AshrafBoston, MA 021111720549397
- Michael Baratz, MDBoston, MA 021111013177534
- William Donaldson, M.D.Boston, MA 021111043235187
- Matthew Gordon, M.D.Boston, MA 021111417215401
- Suzanne Naughton, MDBoston, MA 021111770110819
- Nicholas Pagani, MDBoston, MA 021111104318872
- Vito Pugliano, M.D.Boston, MA 021111245524974
- Sally Rudicel, MDBoston, MA 021111790897106
Common questions
What is John Charles Mazzocco, MD's NPI number?
John Charles Mazzocco, MD's National Provider Identifier (NPI) is 1386266831, issued on May 7, 2020. An NPI identifies a provider in billing; it is not a license.
Where is John Charles Mazzocco, MD located?
The NPPES record lists a practice address at 800 Washington St, Boston, MA, 02111. Phone: (617) 636-5172. Providers update this record themselves, so call before visiting.
How can I verify John Charles Mazzocco, MD's license?
NPPES lists Massachusetts license number 293174, 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 Charles Mazzocco, MD prescribe under Medicare Part D?
In 2024, John Charles Mazzocco, MD had 24 Medicare Part D claims for 18 beneficiaries; the average among orthopaedic surgery physician prescribers was 346. 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.