Ernest Sponzilli, M.D.
NPI 1497709984 · Physical Medicine & Rehabilitation Physician · Larkspur, CA
Enrolled with Medicare as Practitioner - Physical Medicine and Rehabilitation · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ernest Sponzilli, M.D. is a Physical Medicine & Rehabilitation Physician provider in Larkspur, CA (NPI 1497709984).
Provider details
- NPI number
- 1497709984
- Entity type
- Individual
- Primary specialty
- Physical Medicine & Rehabilitation PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G78425 (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
2,300 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 498 | $105 |
| Injection of Anesthetic And/Or Steroid Drug Into Sacral Spine Nerve Root Using Imaging Guidance, Single Level64483 | 209 | $141 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 201 | $147 |
| Needle Measurement of Electrical Activity in Arm Or Leg Muscles, Complete Study95886 | 194 | $87 |
| Injection of Anesthetic And/Or Steroid Drug Into Sacral Spine Nerve Root Using Imaging Guidance, Each Additional Level64484 | 165 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 17 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Gabapentin | 190 | 74 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 173 | 67 |
| Prednisone | 108 | 91 |
| Oxycodone Hcl | 104 | 38 |
| Tramadol Hcl | 61 | 29 |
| Oxycodone Hcl/Acetaminophenbrand: Oxycodone-Acetaminophen | 60 | 22 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$176 across 2 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
- 2006-05-20
- Last updated
- 2023-11-21
- Certified
- 2023-11-21
Frequently asked questions
- What is Ernest Sponzilli's NPI number?
- Ernest Sponzilli's National Provider Identifier (NPI) is 1497709984, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ernest Sponzilli's specialty?
- Ernest Sponzilli is listed in the NPPES registry with a primary specialty of Physical Medicine & Rehabilitation Physician (Allopathic & Osteopathic Physicians).
- Where is Ernest Sponzilli located?
- Ernest Sponzilli's practice location on file with NPPES is 2 Bon Air Rd, Suite 120, Larkspur, CA 94939-1141.
- What is Ernest Sponzilli's phone number?
- The practice phone number listed in the NPPES registry for Ernest Sponzilli is (415) 925-8200.
- Does Ernest Sponzilli accept Medicare?
- Ernest Sponzilli is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ernest Sponzilli's NPI active?
- Yes — Ernest Sponzilli's NPI (1497709984) is active in the NPPES registry as of the last update on 2023-11-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.