Michael O'Reilly, PA-C
NPI 1669139879 · Physician Assistant · Orange, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael O'Reilly, PA-C is a Physician Assistant provider in Orange, CA (NPI 1669139879).
Provider details
- NPI number
- 1669139879
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Male
- Sole proprietor
- No
- License
- PA2557 (NV)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
- Physician Assistant363A00000X
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
4 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
308 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) |
|---|---|---|
| Replacement of Knee Joint, Both Sides of Knee27447 | 165 | $183 |
| Replacement of Thigh Bone and Hip Joint With Prosthesis27130 | 118 | $182 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 25 | $118 |
Typical Medicare-allowed amounts for these services range $118–$183 (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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 12 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Meloxicam | 592 | 318 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 151 | 145 |
| Methocarbamol | 140 | 126 |
| Tramadol Hcl | 75 | 71 |
| Oxycodone Hcl | 75 | 70 |
| Baclofen | 23 | 21 |
| Ondansetron Hcl | 21 | 21 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$209 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
- 2021-11-22
- Last updated
- 2025-11-06
- Certified
- 2025-11-06
Frequently asked questions
- What is Michael O'Reilly's NPI number?
- Michael O'Reilly's National Provider Identifier (NPI) is 1669139879, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael O'Reilly's specialty?
- Michael O'Reilly is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Michael O'Reilly located?
- Michael O'Reilly's practice location on file with NPPES is 101 the City Dr S, Orange, CA 92868-3201.
- What is Michael O'Reilly's phone number?
- The practice phone number listed in the NPPES registry for Michael O'Reilly is (714) 456-8888.
- Does Michael O'Reilly accept Medicare?
- Michael O'Reilly is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael O'Reilly's NPI active?
- Yes — Michael O'Reilly's NPI (1669139879) is active in the NPPES registry as of the last update on 2025-11-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.