Robert Dionisio, MD
NPI 1629539754 · Diagnostic Radiology Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Robert Dionisio, MD is a Diagnostic Radiology Physician provider in San Francisco, CA (NPI 1629539754).
Provider details
- NPI number
- 1629539754
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A176855 (CA)
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
7 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
151 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 for Bone Length Assessment77073 | 45 | $15 |
| 3d Radiographic Procedure With Computerized Image Postprocessing76377 | 44 | $42 |
| X-Ray of Chest, 1 View71045 | 21 | $9 |
| X-Ray of Lower and Sacral Spine, 2-3 Views72100 | 16 | $12 |
| X-Ray of Lower and Sacral Spine, Minimum of 4 Views72110 | 13 | $14 |
| Ct Scan Head Or Brain Without Contrast70450 | 12 | $41 |
Typical Medicare-allowed amounts for these services range $9–$42 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, 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
- 2019-03-29
- Last updated
- 2025-04-18
- Certified
- 2025-04-18
Frequently asked questions
- What is Robert Dionisio's NPI number?
- Robert Dionisio's National Provider Identifier (NPI) is 1629539754, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert Dionisio's specialty?
- Robert Dionisio is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Robert Dionisio located?
- Robert Dionisio's practice location on file with NPPES is 505 Parnassus Ave Fl 3, San Francisco, CA 94143-2204.
- What is Robert Dionisio's phone number?
- The practice phone number listed in the NPPES registry for Robert Dionisio is (415) 353-2887.
- Does Robert Dionisio accept Medicare?
- Robert Dionisio is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Robert Dionisio's NPI active?
- Yes — Robert Dionisio's NPI (1629539754) is active in the NPPES registry as of the last update on 2025-04-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.