Physician Profile
David S Duffy, M.D.
Unclaimed ProfileAbout Dr. Duffy
David S Duffy, M.D. is a healthcare provider in Greenbrae, CA specializing in emergency medicine. David trained at Tufts University School of Medicine, graduating in 1990. Medicare claims data shows David provided 675 services to 638 patients.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
Source: NPPES NPI Registry
Contact Information
- (415) 925-7000
- Email not available
Practice Locations
250 BON AIR RD
Greenbrae, CA 94904
Procedures Most Often Billed to Medicare
675 services · 638 patients · 4 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | Treatment | 93010 |
234 |
| Emergency department visit with high level of medical decision making | Office visit | 99285 |
278 |
| Emergency department visit with moderate level of medical decision making | Office visit | 99284 |
126 |
| Critical care, first 30-74 minutes | Office visit | 99291 |
37 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other emergency medicines at this location 2
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 4
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 30 related providers in 4 groups
Other emergency medicines in Greenbrae 6
Same specialty, same city.
Trained at Tufts University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1990 at Tufts University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 8
Providers in CA who bill this service to Medicare most often.
Common questions
What is Dr. Duffy's specialty?
Dr. Duffy is an emergency medicine in Greenbrae, CA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “EMERGENCY MEDICINE”.
NPI registry
Where can I find Dr. Duffy?
Dr. Duffy is listed at 250 BON AIR RD, Greenbrae, CA 94904. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Duffy?
The number on file is (415) 925-7000. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Duffy?
Dr. Duffy's National Provider Identifier is 1861414203. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Dr. Duffy's medical education?
Dr. Duffy attended Tufts University School of Medicine, graduating in 1990. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Duffy have?
Dr. Duffy has 36 years experience. Calculated from a graduation year of 1990, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Duffy known for?
According to Medicare billing data, Dr. Duffy provides treatments such as routine electrocardiogram using at least 12 leads with interpretation and report only, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Duffy's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Duffy. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.