Steven Tolkan, MD
NPI 1871554766 · Nephrology Physician · Fairfield, CA
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Steven Tolkan, MD is a Nephrology Physician provider in Fairfield, CA (NPI 1871554766).
Provider details
- NPI number
- 1871554766
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- G83696 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
569 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Dialysis Services, 2-3 Physician Visits Per Month (20 Years Or Older)90961 | 192 | $300 |
| Dialysis Services, 4 Or More Physician Visits Per Month (20 Years Or Older)90960 | 147 | $363 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 105 | $138 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 70 | $120 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 33 | $174 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 26 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Losartan Potassium | 76 | 19 |
| Sevelamer Carbonate | 60 | 13 |
| Oxycodone Hcl/Acetaminophenbrand: Oxycodone-Acetaminophen | 55 | — |
| Calcitriol | 32 | — |
| Gabapentin | 26 | — |
| Furosemide | 23 | — |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 20 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$386 across 14 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-03-30
- Last updated
- 2014-04-24
Frequently asked questions
- What is Steven Tolkan's NPI number?
- Steven Tolkan's National Provider Identifier (NPI) is 1871554766, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Steven Tolkan's specialty?
- Steven Tolkan is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Steven Tolkan located?
- Steven Tolkan's practice location on file with NPPES is 1525 Webster St Ste a, Fairfield, CA 94533-4935.
- What is Steven Tolkan's phone number?
- The practice phone number listed in the NPPES registry for Steven Tolkan is (707) 423-2506.
- Does Steven Tolkan accept Medicare?
- Steven Tolkan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Steven Tolkan's NPI active?
- Yes — Steven Tolkan's NPI (1871554766) is active in the NPPES registry as of the last update on 2014-04-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.