Quick answers
- Does David P. Gannon Jr. accept Medicare assignment?
- Yes. Medicare's clinician data says David P. Gannon 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 David P. Gannon Jr. see?
- In 2024, CMS data shows 927 Original Medicare patients and 4,314 services for David P. Gannon Jr.. This counts Original Medicare only and measures volume, not quality.
- What is David P. Gannon Jr.'s NPI number?
- 1518966472. 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 David P. Gannon 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 | 927 |
|---|---|
| Services billed to Medicare | 4,314 |
| Different services or procedures | 41 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Injection, dexamethasone sodium phosphate, 1 mg (J1100)2,711 services
- Anesthesia for lens surgery (00142)904 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)191 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)82 services
- Aspiration and/or injection of fluid large joint using ultrasound guidance (20611)70 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 pressure73%
- Arthritis51%
- Anxiety31%
- Diabetes25%
- Ischemic heart disease24%
Practice locations
Addresses where David P. Gannon Jr. is enrolled with Medicare (CMS data updated October 2, 2026).
- 145 W StMilford, MA 01757 (508) 381‑6040
- 300 Grove StWorcester, MA 01605 (781) 585‑9522
- 68 N Main StCarver, MA 02330 (508) 747‑7246
- 700 Attucks Ln, Unit 1bHyannis, MA 02601 (781) 585‑9522
- 97 Libbey Pkwy, Suite 300Weymouth, MA 02189 (781) 331‑2922
Group practices
Medicare enrollment lists David P. Gannon Jr. as a member of these groups (CMS data updated October 2, 2026).
- South Suburban Gastroenterology PC48 clinicians in the group
- Tri Anesthesia LLC36 clinicians in the group
- JJM Medical Services PC35 clinicians in the group
- On Demand Anesthesia LLC19 clinicians in the group
Specialties
Other anesthesiologists in Milford
Clinicians with the same Medicare primary specialty in Milford, MA — not a recommendation.
Other clinicians in South Suburban Gastroenterology PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1981 (45 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1518966472 |
| 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