Ellen O'Halloran, P.A.-C
NPI 1346618071 · Physician Assistant · Santa Cruz, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ellen O'Halloran, P.A.-C is a Physician Assistant provider in Santa Cruz, CA (NPI 1346618071).
Provider details
- NPI number
- 1346618071
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- P.A.-C
- Sex
- Female
- Sole proprietor
- No
- License
- PA52551 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
10 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
37 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) |
|---|---|---|
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 20 | $105 |
| Emergency Department Visit With High Level of Medical Decision Making99285 | 17 | $153 |
Typical Medicare-allowed amounts for these services range $105–$153 (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
Mailing address
Registry dates
- Enumerated
- 2015-09-11
- Last updated
- 2015-09-11
Frequently asked questions
- What is Ellen O'Halloran's NPI number?
- Ellen O'Halloran's National Provider Identifier (NPI) is 1346618071, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ellen O'Halloran's specialty?
- Ellen O'Halloran is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Ellen O'Halloran located?
- Ellen O'Halloran's practice location on file with NPPES is 620b Sumner St, Santa Cruz, CA 95062-2535.
- What is Ellen O'Halloran's phone number?
- The practice phone number listed in the NPPES registry for Ellen O'Halloran is (408) 464-9619.
- Does Ellen O'Halloran accept Medicare?
- Ellen O'Halloran is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ellen O'Halloran's NPI active?
- Yes — Ellen O'Halloran's NPI (1346618071) is active in the NPPES registry as of the last update on 2015-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.