Doctor profile · Federal record
Dr. John Riordan, MD
Specialist (CMS: Nephrology) · San Francisco, CA
- NPI 1619040227
- Accepts Medicare
- MIPS 82.8 / 100 · 2023
- 39 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
2100 Webster St, Suite 320
San Francisco, CA 941152377
(415) 923-3815
fax (415) 749-5713
Credentials & registration
- NPI registered
- November 2006 — 20 yrs on file
- Profile last updated
- July 29, 2022
- Year of graduation
- 1987 — 39 yrs since
- Specialty taxonomy
- 174400000X — NUCC code
- State license (1)
- California #A52155
- Medicaid
- CA #00A521550
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1619040227. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,429
Distinct HCPCS
10
Medicare allowed
$237,160
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 601 | 173 | $135 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 407 | 170 | $152 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 110 | 99 | $196 | |
90961 |
Dialysis services, 2-3 physician visits per month (20 years or older) | 91 | 21 | $339 | |
90960 |
Dialysis services, 4 or more physician visits per month (20 years or older) | 47 | 16 | $406 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 46 | 38 | $109 | |
99443 |
Telephone medical discussion with physician, 21-30 minutes | 38 | 26 | $153 | |
90962 |
Dialysis services, 1 physician visit per month (20 years or older) | 32 | 13 | $236 | |
81000 |
Manual urinalysis test with examination using microscope, non-automated | 28 | 26 | $4 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 16 | 16 | $197 |
In context: peer comparison
Among 10 peers in San Francisco Specialist, average services per provider: 612. This provider delivers 2.3× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
986
Patients
270
Total drug cost
$309,944
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Losartan Potassium | Generic | 173 | 53 | $2,656 |
| Amlodipine Besylate | Generic | 146 | 49 | $1,814 |
| Farxiga (Dapagliflozin Propanediol) | Brand | 105 | 20 | $124,992 |
| Jardiance (Empagliflozin) | Brand | 81 | 21 | $128,403 |
| Lisinopril | Generic | 74 | 23 | $790 |
| Sevelamer Carbonate | Generic | 57 | 20 | $23,230 |
| Furosemide | Generic | 56 | 23 | $503 |
| Calcitriol | Generic | 49 | 16 | $1,573 |
| Cinacalcet Hcl | Generic | 42 | 0 | $17,286 |
| Hydrochlorothiazide | Generic | 38 | 11 | $201 |
Hospital affiliations
Frequently asked questions
What is Dr. John Riordan's medical specialty?
Dr. John Riordan practices Specialist in San Francisco, CA.
Where does Dr. John Riordan practice?
Dr. John Riordan practices at 2100 Webster St, San Francisco, CA 941152377. Office phone: 4159233815.
What is Dr. John Riordan's NPI?
Dr. John Riordan's National Provider Identifier (NPI) is 1619040227, issued by NPPES.
Does Dr. John Riordan accept Medicare assignment?
Yes. Dr. John Riordan accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. John Riordan commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233); Established patient office or other outpatient visit (HCPCS 99214); Initial hospital care with moderate level of medical decision making (HCPCS 99223). Source: CMS Medicare Physician & Other Practitioners file.