Dr. Jonathan Peter Nass, MD
- Medicare services, 2024
- 667
- Medicare patients, 2024
- 407
- Part D claims, 2024
- 363
- Publications
- 1
- Hospital affiliations
- 1
- Practice address
- 1085 Main Street, South Weymouth, MA 02190
- Practice phone
- Call (781) 331-2922
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Weymouth Endoscopy
Surgery Center - Medicare-Certified · South Weymouth, Massachusetts
Find Dr. Nass' professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Jonathan Peter Nass is a gastroenterologist in South Weymouth, Massachusetts
Dr. Nass practices at Weymouth Endoscopy in South Weymouth, Massachusetts.
Dr. Nass' NPI, 1558587998, was assigned on April 17, 2007. Dr. Nass graduated from Tulane University School of Medicine in 2005. Dr. Nass holds Massachusetts license 252551.
- NPI
- 1558587998NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6800065939
- NPI enumeration date
- April 17, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (781) 331-2922
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 47
- Medical school graduation
- 2005
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Jonathan Peter Nass practices at Weymouth Endoscopy in South Weymouth, Massachusetts
Dr. Nass' primary practice is Weymouth Endoscopy, at 1085 Main Street, South Weymouth, MA 02190. The practice phone is (781) 331-2922.
- Weymouth Endoscopy1085 Main Street, South Weymouth, MA 02190Phone(781) 331-2922
Source: Dmand AI Affiliation Data
Dr. Jonathan Peter Nass is affiliated with 5 sites of care and 4 medical groups
Dr. Nass' primary practice is Weymouth Endoscopy in South Weymouth, Massachusetts. Dr. Nass is also affiliated with South Shore Hospital. The medical group on file is South Shore Medical Center. Dmand AI also links Dr. Nass to 3 more group practices and clinics and 3 medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Jonathan Peter Nass' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Nass practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Weymouth Endoscopy | Available with a free account |
| +4 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Jonathan Peter Nass is one of 597 gastroenterologists in Massachusetts
Gastroenterology is Dr. Nass' primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dmand AI has Dr. Nass' licenses on file in 3 states: Massachusetts, Louisiana and Rhode Island.
Specialties and state licenses
- Gastroenterology, MassachusettsPrimary
- Louisiana license
- Internal medicine, Rhode Island
Gastroenterologists near Dr. Nass
Counts of gastroenterologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Jonathan Peter Nass billed Medicare for 667 services in 2024
CMS data shows 667 Medicare services from Dr. Nass across 14 procedure codes in 2024, for 407 Medicare patients. Medicare paid $69,100 for them.
Dr. Nass' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Surgery
- 2023: 3602024: 32410%
- Office and hospital visits
- 2023: 4082024: 30226%
- Other services
- 2023: 492024: 4116%
Where Dr. Nass' Medicare services took place, 2024
- In an office10716%
- In a facility56084%
Dr. Nass compared with the Massachusetts median for gastroenterologists, 2024
- Dr. Nass
- Massachusetts median
- Medicare services
- 667vs 51929% above
- Medicare patients
- 407vs 34319% above
- Part D claims
- 244vs 30019% below
Medians across 583 gastroenterologists in Massachusetts with Dmand AI profiles that report each measure.
Dr. Nass' most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Nass and other gastroenterologists in Massachusetts.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Jonathan Peter Nass treated 407 Medicare patients in 2024, average age 73
CMS counts 407 Medicare patients who saw Dr. Nass in 2024. The largest group is 65 to 74, with 193 patients. 74% of them have high cholesterol, and 73% have high blood pressure. 22% are also on Medicaid. Their average risk score is 1.46, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Nass' median patient age at 55, with 54% women.
Dr. Nass' Medicare patients by age, 2024
Dr. Nass' Medicare patients by sex, 2024
- Women22054%
- Men18746%
Chronic conditions among Dr. Nass' Medicare patients, 2024
- High cholesterol74%
- High blood pressure73%
- Arthritis49%
- Anxiety36%
- Mood disorders33%
- Chronic kidney disease29%
- Depression29%
- Ischemic heart disease28%
Share of Medicare patients with each condition. A patient can have several.
Dr. Nass' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 55
Patient panel by sex, all payers
- Women54%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Jonathan Peter Nass wrote 363 Medicare Part D claims in 2024
In 2024, Dr. Nass wrote 363 Medicare Part D claims for 99 patients. 74% of them were for generic drugs. CMS names the drug for 244 of them, across 9 drugs with 11 or more claims each, at $46,745 in total drug cost. In 2023, CMS named 146 claims across 6 drugs.
Dr. Nass' Part D claims by kind of drug, 2024
- Generic268 claims74%
- Brand-name95 claims26%
Dr. Nass' most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Nass' Part D claims, 2024
- Antibiotics5%18 of 363 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1462024: 24467%
Drugs named by CMS: 9 in 2024, 6 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Jonathan Peter Nass ranks in the 84th percentile for colonoscopy in Medicare
Dr. Nass accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Nass as offering telehealth. CMS counts 121 procedures of colonoscopy by Dr. Nass, more than 84% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Where Dr. Nass ranks in Medicare procedure volume
- Colonoscopy
- 84th percentile121 procedures
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 80th percentile120 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Jonathan Peter Nass has 1 publication on record
Dmand AI links 1 paper to Dr. Nass. Dr. Nass' most frequent co-author is Sean E. Connolly, MD.
Dr. Nass' most frequent co-authors
Recent publications by Dr. Nass
See who Dr. Nass researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Nass works with, so you can find a warm path to the right gastroenterologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Jonathan Peter Nass received $3,593 in industry payments from 2016 to 2025
CMS Open Payments shows 232 general payments to Dr. Nass from 26 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $900.
General payments to Dr. Nass by program year, 2016 to 2025
Companies that paid Dr. Nass the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Jonathan Peter Nass graduated from Tulane University School of Medicine
Dr. Nass graduated from Tulane University School of Medicine in 2005.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Jonathan Peter Nass's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Jonathan Peter Nass
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Jonathan Peter Nass' NPI number?
Dr. Jonathan Peter Nass' NPI number is 1558587998. It was assigned on April 17, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Jonathan Peter Nass?
Dr. Jonathan Peter Nass is a gastroenterologist in South Weymouth, Massachusetts. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Jonathan Peter Nass practice?
Dr. Nass practices at 1085 Main Street, South Weymouth, MA 02190. Dr. Nass' primary practice is Weymouth Endoscopy in South Weymouth, Massachusetts. Dmand AI also links Dr. Nass to 3 group practices and clinics and 3 medical groups.
What is Dr. Jonathan Peter Nass' office phone number?
The practice phone on file for Dr. Nass is (781) 331-2922.
What is Dr. Jonathan Peter Nass' medical license number?
Dr. Nass holds Massachusetts license 252551, one of the licenses on file in 3 states.
Which states has Dr. Jonathan Peter Nass been licensed in?
Dmand AI has state licenses on file for Dr. Nass in Massachusetts, Louisiana and Rhode Island.
Which hospitals is Dr. Jonathan Peter Nass affiliated with?
Dr. Nass is affiliated with South Shore Hospital.
What medical group is Dr. Jonathan Peter Nass part of?
Dr. Nass is linked to South Shore Medical Center. Dmand AI links Dr. Nass to 3 more medical groups.
Does Dr. Jonathan Peter Nass accept Medicare?
Yes. CMS data shows Dr. Nass billed Medicare for 667 services in 2024, and Dr. Nass accepts Medicare assignment.
Does Dr. Jonathan Peter Nass offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Nass as offering telehealth services.
Show 8 more questionsShow fewer questions
How many Medicare patients does Dr. Jonathan Peter Nass see?
CMS counts 407 Medicare patients who saw Dr. Nass in 2024, with an average age of 73.
What services does Dr. Jonathan Peter Nass bill to Medicare?
In 2024, Dr. Nass' most billed Medicare services were hospital inpatient care (99232), surgery: digestive system (45380) and surgery: digestive system (45385).
Where did Dr. Jonathan Peter Nass go to medical school?
Dr. Nass graduated from Tulane University School of Medicine in 2005.
What drugs does Dr. Jonathan Peter Nass prescribe most?
In 2024 Medicare Part D data, Dr. Nass' most prescribed drugs by claims were Pantoprazole Sodium, Linzess and Omeprazole.
Has Dr. Jonathan Peter Nass received payments from drug or device companies?
CMS Open Payments shows $3,593 in general payments to Dr. Nass from 26 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Jonathan Peter Nass been practicing?
Dr. Nass graduated from medical school in 2005, 21 years ago.
Does Dr. Jonathan Peter Nass do research?
Dmand AI links 1 publication to Dr. Nass.
Who does Dr. Jonathan Peter Nass publish with?
Dr. Nass' most frequent co-authors are Sean E. Connolly, MD (1 shared paper).
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