Doctor profile · Federal record
Dr. Steven Tolkan, MD
Nephrology Physician (CMS: Nephrology) · Internal Medicine Physician · Fairfield, CA
- NPI 1871554766
- 53 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
1525 Webster St Ste A
Fairfield, CA 945334935
(707) 423-2506
fax (707) 429-1158
Credentials & registration
- NPI registered
- March 2006 — 20 yrs on file
- Profile last updated
- April 24, 2014
- Year of graduation
- 1973 — 53 yrs since
- Specialty taxonomy
- 207RN0300X — NUCC code
- State license (1)
- California #G83696
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1871554766. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
596
Distinct HCPCS
4
Medicare allowed
$173,854
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
90961 |
Dialysis services, 2-3 physician visits per month (20 years or older) | 250 | 57 | $299 | |
90960 |
Dialysis services, 4 or more physician visits per month (20 years or older) | 228 | 41 | $359 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 87 | 38 | $136 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 31 | 14 | $175 |
In context: peer comparison
Among 2 peers in Fairfield Nephrology Physician, average services per provider: 113. This provider delivers 5.3× the peer median.Open Payments
Industry payments received
All-time total
$386
Transactions
14
Manufacturers
7
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Amgen INC. | 4 | $190.03 | |
| AstraZeneca Pharmaceuticals Lp | 2 | $44.25 | |
| Boehringer Ingelheim Pharmaceuticals, INC. | 2 | $42.30 | |
| Lilly USA, LLC | 2 | $40.03 | |
| Travere Therapeutics, INC. | 2 | $29.86 | |
| Fresenius USA Marketing, INC. | 1 | $21.19 | |
| Novo Nordisk INC | 1 | $18.32 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
479
Patients
47
Total drug cost
$48,511
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Losartan Potassium | Generic | 60 | 14 | $1,072 |
| Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) | Brand | 59 | 0 | $2,586 |
| Oxycodone-Acetaminophen (Oxycodone Hcl/Acetaminophen) | Brand | 49 | 0 | $2,378 |
| Furosemide | Generic | 47 | 19 | $415 |
| Gabapentin | Generic | 39 | 0 | $1,055 |
| Sevelamer Carbonate | Generic | 38 | 14 | $20,923 |
| Allopurinol | Generic | 28 | 0 | $703 |
| Calcium Acetate | Generic | 24 | 0 | $1,927 |
| Methadone Hcl | Generic | 24 | 0 | $725 |
| Eliquis (Apixaban) | Brand | 23 | 0 | $12,983 |
Hospital affiliations
Frequently asked questions
What is Dr. Steven Tolkan's medical specialty?
Dr. Steven Tolkan practices Nephrology Physician in Fairfield, CA.
Where does Dr. Steven Tolkan practice?
Dr. Steven Tolkan practices at 1525 Webster St Ste A, Fairfield, CA 945334935. Office phone: 7074232506.
What is Dr. Steven Tolkan's NPI?
Dr. Steven Tolkan's National Provider Identifier (NPI) is 1871554766, issued by NPPES.
Does Dr. Steven Tolkan accept Medicare assignment?
Dr. Steven Tolkan does not accept Medicare assignment for all services. Patients may be billed amounts beyond Medicare-allowed charges.
What procedures does Dr. Steven Tolkan commonly perform?
Top Medicare-reported procedures in 2023: Dialysis services, 2-3 physician visits per month (20 years or older) (HCPCS 90961); Dialysis services, 4 or more physician visits per month (20 years or older) (HCPCS 90960); Established patient office or other outpatient visit (HCPCS 99214). Source: CMS Medicare Physician & Other Practitioners file.