Ernest H. Sponzilli, M.D.
Physical Medicine & Rehabilitation Physician · Larkspur, CA
Ernest H. Sponzilli, M.D. is a physical medicine & rehabilitation physician with a practice address in Larkspur, California, and NPI 1497709984, issued on May 20, 2006. Check the license (California G78425, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ernest H. Sponzilli
- Credential
- M.D.
- Primary taxonomy
- Physical Medicine & Rehabilitation Physician 208100000X
- License number
- G78425 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2 Bon Air RD, Suite 120, Larkspur, CA 94939
- Phone
- (415) 925-8200
- Enumerated
- May 20, 2006
- Record last updated
- Nov 21, 2023
- Fax
- (415) 464-5480
- Medicare enrollment
- Enrolled (PECOS I20080702000149); may accept Medicare assignment
- Medical or professional school
- Albany Medical College Of Union University, 1992
- Entity
- Type 1 · individual
8 nearest physical medicine & rehabilitation physician records → All 1,549 in California → Look up another NPI →
Verify Ernest H. Sponzilli in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G78425Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
39% more Medicare Part D claims than the average physical medicine & rehabilitation physician in 2024
1,011 Medicare Part D claims for 306 beneficiaries, against an average of 727 among the 7,448 providers of this specialty who prescribed in Part D. 453 claims were for opioids.
Most prescribed
- Gabapentin190 claims
- Hydrocodone-Acetaminophen173 claims
- Prednisone108 claims
- Oxycodone Hcl104 claims
- Tramadol Hcl61 claims
- Oxycodone-Acetaminophen60 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): 0 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: $176.40
2 payments; by number, the most common kind was food and beverage; the largest payer was Biotronik Nro, Inc. The 3,895 providers of this specialty with any payment received $1,237.86 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.
Bills Medicare through one group practice
- Regents Univ OF California UcsfSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ernest H. Sponzilli among 1,549 physical medicine & rehabilitation physician records in California
Ernest H. Sponzilli, M.D. is one of 1,549 physical medicine & rehabilitation physician records with a practice address in California. 59% 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 3% of them.
- NPI issued2006 · 3% of these records are older, 70% newer
- In a Medicare fileYes · 59% of these records are
- In the CMS Doctors and Clinicians fileYes · 51% of these records are
- Graduated1992 · median 2008 among the 786 with a school on file
- Record last updated2023 · 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 208100000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Physical Medicine & Rehabilitation Physician providers in California
There are 1,549 physical medicine & rehabilitation physician records in California.
All 1,549 in California → Every provider in Larkspur → Physical Medicine & Rehabilitation Physician nationwide →
The 8 physical medicine & rehabilitation physician records with the nearest ZIP codes
- Brooke Bennis, D.O.Mill Valley, CA 949411811169683
- Marsha Guisard, MDMill Valley, CA 949411629194121
- Cristie Bennett, P.T.Novato, CA 949451104153360
- Holly Kelly, MDNovato, CA 949451619076528
- Madeleine Alfiero, DPTFairfax, CA 949301710503024
- Shannon Chain, MDPetaluma, CA 949541447575428
- Diane Murray, MDPetaluma, CA 949541174607154
- Alex Barchuk, M.D.Kentfield, CA 949041851315774
Common questions
What is Ernest H. Sponzilli, M.D.'s NPI number?
Ernest H. Sponzilli, M.D.'s National Provider Identifier (NPI) is 1497709984, issued on May 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ernest H. Sponzilli, M.D. located?
The NPPES record lists a practice address at 2 Bon Air RD, Suite 120, Larkspur, CA, 94939. Phone: (415) 925-8200. Providers update this record themselves, so call before visiting.
How can I verify Ernest H. Sponzilli, M.D.'s license?
NPPES lists California license number G78425, 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 Ernest H. Sponzilli, M.D. prescribe under Medicare Part D?
In 2024, Ernest H. Sponzilli, M.D. had 1,011 Medicare Part D claims for 306 beneficiaries; the average among physical medicine & rehabilitation physician prescribers was 727. Part D covers Medicare prescriptions only.
What is Ernest H. Sponzilli, M.D.'s MIPS final score?
The 2023 MIPS final score is 0 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.