John Mahoney, MD
NPI 1821076845 · Diagnostic Radiology Physician · South Weymouth, MA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Mahoney, MD is a Diagnostic Radiology Physician provider in South Weymouth, MA (NPI 1821076845).
Provider details
- NPI number
- 1821076845
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 58715 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 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
3,965 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) |
|---|---|---|
| X-Ray of Chest, 2 Views71046 | 638 | $11 |
| X-Ray of Chest, 1 View71045 | 482 | $9 |
| Ct Scan Head Or Brain Without Contrast70450 | 348 | $41 |
| Ct Scan of Upper Spine Without Contrast72125 | 316 | $48 |
| Ultrasound Study of One Arm Or Leg Veins With Compression and Maneuvers93971 | 284 | $22 |
| Ultrasound of Both Sides of Head and Neck Blood Flow93880 | 172 | $39 |
| Ct Scan of Abdomen and Pelvis With Contrast |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-01-09
- Last updated
- 2026-02-13
- Certified
- 2026-02-13
Frequently asked questions
- What is John Mahoney's NPI number?
- John Mahoney's National Provider Identifier (NPI) is 1821076845, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Mahoney's specialty?
- John Mahoney is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is John Mahoney located?
- John Mahoney's practice location on file with NPPES is 55 Fogg Rd, South Weymouth, MA 02190-2432.
- What is John Mahoney's phone number?
- The practice phone number listed in the NPPES registry for John Mahoney is (781) 337-7011.
- Does John Mahoney accept Medicare?
- John Mahoney is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Mahoney's NPI active?
- Yes — John Mahoney's NPI (1821076845) is active in the NPPES registry as of the last update on 2026-02-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.