What is Julia Ondarza's NPI number?

Julia Ondarza's National Provider Identifier (NPI) is 1013537794, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Julia Ondarza's specialty?

Julia Ondarza is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).

Where is Julia Ondarza located?

Julia Ondarza's practice location on file with NPPES is 2637 Shadelands Dr, Walnut Creek, CA 94598-2512.

What is Julia Ondarza's phone number?

The practice phone number listed in the NPPES registry for Julia Ondarza is (925) 430-5335.

Does Julia Ondarza accept Medicare?

Julia Ondarza is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.

Is Julia Ondarza's NPI active?

Yes — Julia Ondarza's NPI (1013537794) is active in the NPPES registry as of the last update on 2025-10-29.

IndividualActiveAccepts Medicare

Julia Ondarza, PA-C

NPI 1013537794 · Physician Assistant · Walnut Creek, CA

Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)

Julia Ondarza, PA-C is a Physician Assistant provider in Walnut Creek, CA (NPI 1013537794).

Provider details

NPI number: 1013537794
Entity type: Individual
Primary specialty: Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
Credential: PA-C
Sex: Female
Sole proprietor: No
License: 60191 (CA)

Specialties & taxonomies

Physician AssistantPrimary363A00000XLicense 60191 (CA)
Physician Assistants & Advanced Practice Nursing Providers
Medical Physician Assistant363AM0700XLicense 60191 (CA)
Physician Assistants & Advanced Practice Nursing Providers

Profile Score

Established profile(53/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure28% of score
6 yrs in NPPES registry
Profile completeness28% of score
100% of core fields populated
Practice footprint17% of score
3 documented practice locations
Medicare service volume (vs. specialty peers)28% of score
13 Medicare services, 2024 (ranked within specialty)

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 methodology.

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)
Critical Care, First 30-74 Minutes99291	13	$198

Typical Medicare-allowed amounts for these services range $198–$198 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.

Practice location

2637 Shadelands Dr

Walnut Creek, CA 94598-2512

Phone: (925) 430-5335

Fax: (925) 430-5446

Street-level locationGet directions

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Mailing address