Courtney O'Brien, DO
NPI 1609396514 · Rheumatology Physician · Simi Valley, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Courtney O'Brien, DO is a Rheumatology Physician provider in Simi Valley, CA (NPI 1609396514).
Provider details
- NPI number
- 1609396514
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Female
- Sole proprietor
- No
- License
- 20A18469 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
9 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
1,007 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 | 349 | $138 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 313 | $17 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 73 | $178 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 63 | $193 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 54 | $235 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 29 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydroxychloroquine Sulfate | 150 | 51 |
| Gabapentin | 110 | 30 |
| Prednisone | 105 | 34 |
| Methotrexate Sodiumbrand: Methotrexate | 105 | 34 |
| Meloxicam | 71 | 29 |
| Duloxetine Hcl | 44 | 15 |
| Alendronate Sodium | 42 | 16 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$294 across 5 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
- 2017-06-21
- Last updated
- 2022-07-29
- Certified
- 2022-07-29
Frequently asked questions
- What is Courtney O'Brien's NPI number?
- Courtney O'Brien's National Provider Identifier (NPI) is 1609396514, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Courtney O'Brien's specialty?
- Courtney O'Brien is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Courtney O'Brien located?
- Courtney O'Brien's practice location on file with NPPES is 2655 1st St Ste 380, Simi Valley, CA 93065-1551.
- What is Courtney O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Courtney O'Brien is (805) 583-7640.
- Does Courtney O'Brien accept Medicare?
- Courtney O'Brien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Courtney O'Brien's NPI active?
- Yes — Courtney O'Brien's NPI (1609396514) is active in the NPPES registry as of the last update on 2022-07-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.