Steven P. Guarnaccia, MD
Urology Physician · Redwood City, CA
Steven P. Guarnaccia, MD is a urology physician with a practice address in Redwood City, California, and NPI 1235299850, issued on Dec 12, 2006. Check the license (California G170917, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Steven P. Guarnaccia
- Credential
- MD
- Primary taxonomy
- Urology Physician 208800000X
- License numbers
- G170917 CA
MD21580 DC
D0047881 MD
Self-reported in NPPES; status is on the state search - Practice location
- 2900 Whipple Ave Ste 132, Redwood City, CA 94062
- Phone
- (650) 306-1016
- Enumerated
- Dec 12, 2006
- Record last updated
- Apr 16, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (650) 216-9403
- Entity
- Type 1 · individual
8 nearest urology physician records → All 1,524 in California → Look up another NPI →
Also registered at 2900 Whipple Ave Ste 132
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ulf Fritz Bredeek Mendes, M.D., PHDInfectious Disease Physician1689667495
- Andres Hernandez, PA-CPhysician Assistant1609588847
- Delmar Smith, PAPhysician Assistant1902188832
Verify Steven P. Guarnaccia in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G170917Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
40% fewer Medicare Part D claims than the average urology physician in 2024
800 Medicare Part D claims for 223 beneficiaries, against an average of 1,340 among the 10,782 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 12 claims were for opioids.
Most prescribed
- Tamsulosin Hcl320 claims
- Finasteride126 claims
- Myrbetriq80 claims
- Alfuzosin Hcl Er52 claims
- Estradiol33 claims
- Ciprofloxacin Hcl30 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 96.5 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $393.56
4 payments; by number, the most common kind was food and beverage; the largest payer was Boston Scientific Corporation. The 9,340 providers of this specialty with any payment received $3,800.04 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Steven P. Guarnaccia among 1,524 urology physician records in California
Steven P. Guarnaccia, MD is one of 1,524 urology physician records with a practice address in California. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 51% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 69% of these records are
- Record last updated2021 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208800000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Urology Physician providers in California
There are 1,524 urology physician records in California.
All 1,524 in California → Every provider in Redwood City → Urology Physician nationwide →
The 8 urology physician records with the nearest ZIP codes
- Tien Pham, MDRedwood City, CA 940631225116874
- Chris Threatt, MDRedwood City, CA 940631568466589
- Karl Anderson, MDSouth San Francisco, CA 940801700964301
- Mark Gasparini, MDSouth San Francisco, CA 940801790863348
- Eugene Seto, MDSouth San Francisco, CA 940801811075427
- Alex Wu, M.D.South San Francisco, CA 940801063747152
- Arnold AigenMountain View, CA 940401063508109
- Scott Angell, MDMountain View, CA 940401720175425
Common questions
What is Steven P. Guarnaccia, MD's NPI number?
Steven P. Guarnaccia, MD's National Provider Identifier (NPI) is 1235299850, issued on Dec 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Steven P. Guarnaccia, MD located?
The NPPES record lists a practice address at 2900 Whipple Ave Ste 132, Redwood City, CA, 94062. Phone: (650) 306-1016. Providers update this record themselves, so call before visiting.
How can I verify Steven P. Guarnaccia, MD's license?
NPPES lists California license number G170917, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Steven P. Guarnaccia, MD prescribe under Medicare Part D?
In 2024, Steven P. Guarnaccia, MD had 800 Medicare Part D claims for 223 beneficiaries; the average among urology physician prescribers was 1,340. Part D covers Medicare prescriptions only.
What is Steven P. Guarnaccia, MD's MIPS final score?
The 2023 MIPS final score is 96.5 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.