Jonathan Nass, M.D.
NPI 1558587998 · Gastroenterology Physician · South Weymouth, MA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jonathan Nass, M.D. is a Gastroenterology Physician provider in South Weymouth, MA (NPI 1558587998).
Provider details
- NPI number
- 1558587998
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- LP00455 (RI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
667 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 120 | $82 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 92 | $119 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 90 | $264 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 88 | $136 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 83 | $110 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 79 | 33 |
| Linaclotidebrand: Linzess | 43 | — |
| Omeprazole | 38 | 12 |
| Prednisone | 17 | — |
| Sucralfate | 16 | — |
| Cholestyramine (with Sugar)brand: Cholestyramine | 14 | — |
| Famotidine | 14 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-04-17
- Last updated
- 2019-12-18
- Certified
- 2019-12-18
Frequently asked questions
- What is Jonathan Nass's NPI number?
- Jonathan Nass's National Provider Identifier (NPI) is 1558587998, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jonathan Nass's specialty?
- Jonathan Nass is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Jonathan Nass located?
- Jonathan Nass's practice location on file with NPPES is 1085 Main St, South Weymouth, MA 02190-1547.
- What is Jonathan Nass's phone number?
- The practice phone number listed in the NPPES registry for Jonathan Nass is (781) 331-2922.
- Does Jonathan Nass accept Medicare?
- Jonathan Nass is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jonathan Nass's NPI active?
- Yes — Jonathan Nass's NPI (1558587998) is active in the NPPES registry as of the last update on 2019-12-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.