Quick answers
- Does John P. Donahue accept Medicare assignment?
- Yes. Medicare's clinician data says John P. Donahue 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 John P. Donahue see?
- In 2024, CMS data shows 2,674 Original Medicare patients and 3,305 services for John P. Donahue. This counts Original Medicare only and measures volume, not quality.
- What is John P. Donahue's NPI number?
- 1588660435. 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 John P. Donahue, 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 | 2,674 |
|---|---|
| Services billed to Medicare | 3,305 |
| Different services or procedures | 112 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- X-ray of chest, 1 view (71045)320 services
- Ct scan of chest without contrast (71250)236 services
- Complete ultrasound scan behind abdominal cavity (76770)208 services
- Ultrasound study of one arm or leg veins with compression and maneuvers (93971)199 services
- Ct scan of chest with contrast (71260)159 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 blood pressure75%
- High cholesterol75%
- Arthritis60%
- Diabetes41%
- Ischemic heart disease39%
- Anxiety36%
Hospitals where John P. Donahue works
Medicare's Facility Affiliation Data lists John P. Donahue at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Bridgeport HospitalBridgeport, CT · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 070010
- Griffin HospitalDerby, CT · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 070031
- Middlesex HospitalMiddletown, CT · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 070020
- Yale-New Haven HospitalNew Haven, CT · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 070022
Practice locations
Addresses where John P. Donahue is enrolled with Medicare (CMS data updated October 2, 2026).
- 10948 Bigge St, Suite ASan Leandro, CA 94577 (800) 786‑8015
- 460 Smith St, Suite AMiddletown, CT 06457 (800) 786‑8015
- 55 Lock StNew Haven, CT 06511 (203) 432‑0076
- 965 E Yosemite Ave, Suite 24Manteca, CA 95336 (800) 786‑8015
Group practices
Medicare enrollment lists John P. Donahue as a member of these groups (CMS data updated October 2, 2026).
- Yale University2,645 clinicians in the group
- Reono Bertagnolli a Medical Group47 clinicians in the group
- Kan-Di-Ki LLC38 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in San Leandro
Clinicians with the same Medicare primary specialty in San Leandro, CA — not a recommendation.
Other clinicians in Yale University
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Georgetown University School Of Medicine |
| Graduation year | 1991 (35 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1588660435 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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