Daniel Diffin, MD
NPI 1649240821 · Diagnostic Radiology Physician · Westerly, RI
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Daniel Diffin, MD is a Diagnostic Radiology Physician provider in Westerly, RI (NPI 1649240821).
Provider details
- NPI number
- 1649240821
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MD10260 (RI)
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
1,517 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) |
|---|---|---|
| Screening 3d Breast Mammography77063 | 419 | $29 |
| Screening Mammography77067 | 419 | $36 |
| Screening Mammography77067 | 322 | $36 |
| Screening 3d Breast Mammography77063 | 321 | $28 |
| Complete Ultrasound Scan of 1 Breast76641 | 36 | $52 |
Typical Medicare-allowed amounts for these services range $28–$52 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-01-23
- Last updated
- 2017-11-29
Frequently asked questions
- What is Daniel Diffin's NPI number?
- Daniel Diffin's National Provider Identifier (NPI) is 1649240821, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Daniel Diffin's specialty?
- Daniel Diffin is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Daniel Diffin located?
- Daniel Diffin's practice location on file with NPPES is 25 Wells Street, Westerly, RI 02891.
- What is Daniel Diffin's phone number?
- The practice phone number listed in the NPPES registry for Daniel Diffin is (860) 415-9248.
- Does Daniel Diffin accept Medicare?
- Daniel Diffin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Daniel Diffin's NPI active?
- Yes — Daniel Diffin's NPI (1649240821) is active in the NPPES registry as of the last update on 2017-11-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.