Physician Profile
John W. Riordan, MD
Unclaimed ProfileAbout Dr. Riordan
Listed in the NPI registry as a specialist, John W. Riordan, MD practices in San Francisco, CA. John graduated from University of Texas Medical Branch at Galveston in 1987. Medicare claims data shows John provided 1,433 services to 632 patients. The services billed most often include subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes, established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more, and initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes.
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) 923-3815
- Email not available
Practice Locations
2100 WEBSTER ST SUITE 320
San Francisco, CA 94115
Procedures Most Often Billed to Medicare
1,433 services · 632 patients · 11 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Dialysis services, 2-3 physician visits per month (20 years or older) | Treatment | 90961 |
108 |
| Dialysis services, 4 or more physician visits per month (20 years or older) | Treatment | 90960 |
83 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | Office visit | 99233 |
653 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
302 |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
148 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
46 |
| Telephone medical discussion with physician, 21-30 minutes | Office visit | 99443 |
34 |
| Telephone medical discussion with physician, 11-20 minutes | Office visit | 99442 |
16 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
16 |
| Manual urinalysis test with examination using microscope, non-automated | Lab test | 81000 |
16 |
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.
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.
Other specialists in San Francisco 8
Same specialty, same city.
Trained at University of Texas Medical Branch at Galveston 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 1987 at University of Texas Medical Branch at Galveston 8
Providers who graduated from the same medical school in the same year.
Also performs Dialysis services, 2-3 physician visits per month (20 years or older) 8
Providers in CA who bill this service to Medicare most often.
Common questions
What kind of doctor is Dr. Riordan?
Dr. Riordan is a specialist in San Francisco, CA. That is the designation recorded for this NPI in the federal registry.
NPI registry
What is Dr. Riordan's address?
Dr. Riordan is listed at 2100 Webster St Suite 320, San Francisco, CA 94115. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. Riordan?
The number on file is (415) 923-3815. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Riordan?
Dr. Riordan's National Provider Identifier is 1619040227. 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
Where did Dr. Riordan train?
Dr. Riordan attended University of Texas Medical Branch at Galveston, graduating in 1987. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Riordan have?
Dr. Riordan has 39 years experience. Calculated from a graduation year of 1987, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. Riordan perform?
According to Medicare billing data, Dr. Riordan provides treatments such as dialysis services, 2-3 physician visits per month and dialysis services, 4 or more physician visits per month, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Riordan's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Riordan. 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.