Gonzalo Obnial, M.D.
NPI 1497909931 · Vascular Surgery Physician · Walnut Creek, CA
Enrolled with Medicare as Practitioner - Vascular Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gonzalo Obnial, M.D. is a Vascular Surgery Physician provider in Walnut Creek, CA (NPI 1497909931).
Provider details
- NPI number
- 1497909931
- Entity type
- Individual
- Primary specialty
- Vascular Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 4301091346 (MI)
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
17 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
2,374 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 358 | $163 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 350 | $116 |
| Ultrasound of Leg Arteries Or Artery Grafts93925 | 311 | $340 |
| Ultrasound Study of Arm and Leg Arteries93922 | 263 | $100 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 164 | $141 |
| Ultrasound of Hemodialysis Access93990 | 157 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 5 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Clopidogrel Bisulfatebrand: Clopidogrel | 232 | 81 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 32 | 27 |
| Rivaroxabanbrand: Xarelto | 31 | — |
| Pantoprazole Sodium | 18 | — |
| Apixabanbrand: Eliquis | 11 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,160 across 41 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
Additional practice locations (1)
- 350 30th St Ste 210Oakland, CA 94609-3425Phone: (510) 832-6131Fax: (510) 832-6169
Registry dates
- Enumerated
- 2008-11-11
- Last updated
- 2025-02-28
- Certified
- 2025-02-28
Frequently asked questions
- What is Gonzalo Obnial's NPI number?
- Gonzalo Obnial's National Provider Identifier (NPI) is 1497909931, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gonzalo Obnial's specialty?
- Gonzalo Obnial is listed in the NPPES registry with a primary specialty of Vascular Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Gonzalo Obnial located?
- Gonzalo Obnial's practice location on file with NPPES is 2637 Shadelands Dr, Walnut Creek, CA 94598-2512.
- What is Gonzalo Obnial's phone number?
- The practice phone number listed in the NPPES registry for Gonzalo Obnial is (925) 932-6330.
- Does Gonzalo Obnial accept Medicare?
- Gonzalo Obnial is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gonzalo Obnial's NPI active?
- Yes — Gonzalo Obnial's NPI (1497909931) is active in the NPPES registry as of the last update on 2025-02-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.