Quick answers
- Does James J. Sullivan Jr. accept Medicare assignment?
- Yes. Medicare's clinician data says James J. Sullivan Jr. accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does James J. Sullivan Jr. see?
- In 2024, CMS data shows 451 Original Medicare patients and 14,966 services for James J. Sullivan Jr.. This counts Original Medicare only and measures volume, not quality.
- What is James J. Sullivan Jr.'s NPI number?
- 1730161308. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for James J. Sullivan Jr., data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 451 |
|---|---|
| Services billed to Medicare | 14,966 |
| Different services or procedures | 58 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Injection, daptomycin, 1 mg (J0878)13,450 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)195 services
- Injection, ceftriaxone sodium, per 250 mg (J0696)160 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)111 services
- Detection test by multiplex amplified probe technique for severe acute respiratory syndrome coronavirus 2 (sars-cov-2) (covid-19) and influenza virus types a and b (87636)85 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure74%
- Arthritis53%
- Anxiety35%
- Diabetes31%
- Depression30%
Practice locations
Addresses where James J. Sullivan Jr. is enrolled with Medicare (CMS data updated October 2, 2026).
- 366 Shrewsbury StWorcester, MA 01604 (508) 595‑2700
Group practices
Medicare enrollment lists James J. Sullivan Jr. as a member of this group (CMS data updated October 2, 2026).
- Reliant Medical Group Inc640 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Worcester
Clinicians with the same Medicare primary specialty in Worcester, MA — not a recommendation.
Other clinicians in Reliant Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1995 (31 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1730161308 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians