Jonathan Peter Nass, M.D.
Gastroenterology Physician · South Weymouth, MA
Jonathan Peter Nass, M.D. is a gastroenterology physician with a practice address in South Weymouth, Massachusetts, and NPI 1558587998, issued on Apr 17, 2007. Check the license (Massachusetts 252551, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Jonathan Peter Nass
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License numbers
- 252551 MA
MD.202069 LA
LP00455 RI
Self-reported in NPPES; status is on the state search - Practice location
- 1085 Main St, South Weymouth, MA 02190
- Phone
- (781) 331-2922
- Enumerated
- Apr 17, 2007
- Record last updated
- Dec 18, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (781) 335-5702
- Medicaid IDs
- 1106887 LA
05750222 MS - Medicare enrollment
- Enrolled (PECOS I20121003000303); accepts Medicare assignment
- Medical or professional school
- Tulane University School Of Medicine, 2005
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 686 in Massachusetts → Look up another NPI →
Also registered at 1085 Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mona AkbariGastroenterology Physician1871720037
- Gregory Bolduc, MDGastroenterology Physician1821078767
- Clayland Cox, MDGastroenterology Physician1043290752
- Fernando Martinez, M.D.Gastroenterology Physician1255598165
- James Moore, MDGastroenterology Physician1154301422
- Bradford Sampson, M.D.Gastroenterology Physician1962410548
Verify Jonathan Peter Nass in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 252551Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
55% fewer Medicare Part D claims than the average gastroenterology physician in 2024
363 Medicare Part D claims for 99 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 26% of claims.
Most prescribed
- Pantoprazole Sodium79 claims
- Linzess43 claims
- Omeprazole38 claims
- Prednisone17 claims
- Sucralfate16 claims
- Cholestyramine14 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 2 group practices
- South Shore Medical Center, Inc.Norwell, MA
- South Suburban Gastroenterology PCWeymouth, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jonathan Peter Nass among 686 gastroenterology physician records in Massachusetts
Jonathan Peter Nass, M.D. is one of 686 gastroenterology physician records with a practice address in Massachusetts. 80% 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 51% of them.
- NPI issued2007 · 51% of these records are older, 40% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2005 · median 2004 among the 491 with a school on file
- Record last updated2019 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
8 gastroenterology physician records list a practice address in South Weymouth
They are 8 of the 445 NPPES records with a practice address in South Weymouth, and 686 gastroenterology physician records in Massachusetts.
All 686 in Massachusetts → Every provider in South Weymouth → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Mona AkbariSouth Weymouth, MA 021901871720037
- Gregory Bolduc, MDSouth Weymouth, MA 021901821078767
- Clayland Cox, MDSouth Weymouth, MA 021901043290752
- Fernando Martinez, M.D.South Weymouth, MA 021901255598165
- James Moore, MDSouth Weymouth, MA 021901154301422
- Bradford Sampson, M.D.South Weymouth, MA 021901962410548
- John Vermeulen, MDSouth Weymouth, MA 021901215917596
- Daniel Mishkin, M.D.Weymouth, MA 021891801822564
Common questions
What is Jonathan Peter Nass, M.D.'s NPI number?
Jonathan Peter Nass, M.D.'s National Provider Identifier (NPI) is 1558587998, issued on Apr 17, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Jonathan Peter Nass, M.D. located?
The NPPES record lists a practice address at 1085 Main St, South Weymouth, MA, 02190. Phone: (781) 331-2922. Providers update this record themselves, so call before visiting.
How can I verify Jonathan Peter Nass, M.D.'s license?
NPPES lists Massachusetts license number 252551, 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 Jonathan Peter Nass, M.D. prescribe under Medicare Part D?
In 2024, Jonathan Peter Nass, M.D. had 363 Medicare Part D claims for 99 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.