Christopher Massari, M.D.
Internal Medicine Physician · Oswego, NY
Christopher Massari, M.D. is an internal medicine physician with a practice address in Oswego, New York, and NPI 1700948973, issued on Dec 14, 2006. Check the license (New York 336551, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Christopher Massari
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 336551 NY
MD28579 OR
Self-reported in NPPES; status is on the state search - Practice location
- 110 W 6TH St, Oswego, NY 13126
- Phone
- (315) 349-5511
- Enumerated
- Dec 14, 2006
- Record last updated
- Jun 19, 2025
- Fax
- (315) 349-5785
- Medicaid ID
- 279366 OR
- Medicare enrollment
- Enrolled (PECOS I20250707001198); accepts Medicare assignment
- Medical or professional school
- University Of Vermont College Of Medicine, 2002
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 12,067 in New York → Look up another NPI →
Also registered at 110 W 6TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Michael Alcasid, M.D.Internal Medicine Physician1346357233
- Cynthia Althouse, NPPPsychiatric/Mental Health Nurse Practitioner1881205847
- Paige Barker, RN, CDEDiabetes Educator Registered Nurse1568243152
- Sarah Botting, PHARMDPharmacist1477945244
- Lauren Boulet, SLPSpeech-Language Pathologist1871993188
Verify Christopher Massari in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 336551Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
One hospital affiliation
- Oswego HospitalOswego, NY · Acute Care Hospitals3 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Christopher Massari among 12,067 internal medicine physician records in New York
Christopher Massari, M.D. is one of 12,067 internal medicine physician records with a practice address in New York. 79% 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 8% of them.
- NPI issued2006 · 8% of these records are older, 53% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2002 · median 2002 among the 7,221 with a school on file
- Record last updated2025 · 61% 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 New York 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 Oswego
They are 15 of the 1,198 NPPES records with a practice address in Oswego, and 12,067 internal medicine physician records in New York.
All 12,067 in New York → Every provider in Oswego → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Michael Alcasid, M.D.Oswego, NY 131261346357233
- Carmen Bautista Dator, MDOswego, NY 131261346267291
- Carlos Dator, MDOswego, NY 131261447271259
- Joy Dolorico-Magsino, M.D.Oswego, NY 131261467569319
- Soo Kim, MDOswego, NY 131261851475958
- Matthew Liepke, M.D.Oswego, NY 131261245220656
- Mario Magsino, M.D.Oswego, NY 131261922115427
- Renato Mandanas, M.D.Oswego, NY 131261154492296
Common questions
What is Christopher Massari, M.D.'s NPI number?
Christopher Massari, M.D.'s National Provider Identifier (NPI) is 1700948973, issued on Dec 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Christopher Massari, M.D. located?
The NPPES record lists a practice address at 110 W 6TH St, Oswego, NY, 13126. Phone: (315) 349-5511. Providers update this record themselves, so call before visiting.
How can I verify Christopher Massari, M.D.'s license?
NPPES lists New York license number 336551, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
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.