Stephen Fernau, APRN, CRNA
NPI 1851343123 · Certified Registered Nurse Anesthetist · Tucson, AZ
Enrolled with Medicare as Practitioner - Certified Registered Nurse Anesthetist (crna) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Fernau, APRN, CRNA is a Certified Registered Nurse Anesthetist provider in Tucson, AZ (NPI 1851343123).
Provider details
- NPI number
- 1851343123
- Entity type
- Individual
- Primary specialty
- Certified Registered Nurse AnesthetistPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- APRN, CRNA
- Sex
- Male
- Sole proprietor
- No
- License
- 141905030 (WI)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
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
3 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
53 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) |
|---|---|---|
| Anesthesia for Lens Surgery00142 | 25 | $117 |
| Anesthesia for Other Procedure on Large Bowel Using an Endoscope00811 | 16 | $89 |
| Anesthesia for Other Procedure on Esophagus, Stomach, Or Upper Small Bowel Using an Endoscope00731 | 12 | $89 |
Typical Medicare-allowed amounts for these services range $89–$117 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$17 across 1 record (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
Additional practice locations (2)
- 1425 N Randall RdElgin, IL 60123-2300Phone: (847) 742-9800
- 39w360 Cambridge CtSaint Charles, IL 60175-6706Phone: (630) 584-1236Fax: (630) 584-1236
Registry dates
- Enumerated
- 2006-05-16
- Last updated
- 2025-01-05
- Certified
- 2025-01-05
Frequently asked questions
- What is Stephen Fernau's NPI number?
- Stephen Fernau's National Provider Identifier (NPI) is 1851343123, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Fernau's specialty?
- Stephen Fernau is listed in the NPPES registry with a primary specialty of Certified Registered Nurse Anesthetist (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Stephen Fernau located?
- Stephen Fernau's practice location on file with NPPES is 1625 N Campbell Ave, Tucson, AZ 85719-4330.
- What is Stephen Fernau's phone number?
- The practice phone number listed in the NPPES registry for Stephen Fernau is (520) 694-0111.
- Does Stephen Fernau accept Medicare?
- Stephen Fernau is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Fernau's NPI active?
- Yes — Stephen Fernau's NPI (1851343123) is active in the NPPES registry as of the last update on 2025-01-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.