Steven Guarnaccia, MD
NPI 1235299850 · Urology Physician · Redwood City, CA
Enrolled with Medicare as Practitioner - Urology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Steven Guarnaccia, MD is a Urology Physician provider in Redwood City, CA (NPI 1235299850).
Provider details
- NPI number
- 1235299850
- Entity type
- Individual
- Primary specialty
- Urology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- D0047881 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
19 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
586 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) |
|---|---|---|
| Urinalysis, Manual Test81002 | 143 | $3 |
| Ultrasound Measurement of Bladder Capacity After Voiding51798 | 114 | $16 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 102 | $159 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 65 | $114 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 58 | $201 |
| Simple Insertion of Temporary Bladder Tube51702 | 30 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Tamsulosin Hcl | 320 | 101 |
| Finasteride | 126 | 43 |
| Mirabegronbrand: Myrbetriq | 80 | 32 |
| Alfuzosin Hclbrand: Alfuzosin Hcl Er | 52 | 19 |
| Estradiol | 33 | 11 |
| Ciprofloxacin Hcl | 30 | 27 |
| Oxybutynin Chloridebrand: Oxybutynin Chloride Er | 30 | 11 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$394 across 4 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
- 2006-12-12
- Last updated
- 2021-04-16
- Certified
- 2021-04-16
Frequently asked questions
- What is Steven Guarnaccia's NPI number?
- Steven Guarnaccia's National Provider Identifier (NPI) is 1235299850, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Steven Guarnaccia's specialty?
- Steven Guarnaccia is listed in the NPPES registry with a primary specialty of Urology Physician (Allopathic & Osteopathic Physicians).
- Where is Steven Guarnaccia located?
- Steven Guarnaccia's practice location on file with NPPES is 2900 Whipple Ave Ste 132, Redwood City, CA 94062-2844.
- What is Steven Guarnaccia's phone number?
- The practice phone number listed in the NPPES registry for Steven Guarnaccia is (650) 306-1016.
- Does Steven Guarnaccia accept Medicare?
- Steven Guarnaccia is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Steven Guarnaccia's NPI active?
- Yes — Steven Guarnaccia's NPI (1235299850) is active in the NPPES registry as of the last update on 2021-04-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.