Robert O'Hollaren, M.D.
NPI 1801852710 · Adult Reconstructive Orthopaedic Surgery Physician · Ventura, CA
Enrolled with Medicare as Practitioner - Orthopedic Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Robert O'Hollaren, M.D. is a Adult Reconstructive Orthopaedic Surgery Physician provider in Ventura, CA (NPI 1801852710).
Provider details
- NPI number
- 1801852710
- Entity type
- Individual
- Primary specialty
- Adult Reconstructive Orthopaedic Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G39131 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 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
461 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 159 | $136 |
| Aspiration And/Or Injection of Fluid From Large Joint20610 | 111 | $78 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 82 | $97 |
| X-Ray of Knee, 4 Or More Views73564 | 36 | $53 |
| X-Ray of Lower and Sacral Spine, 2-3 Views72100 | 17 | $43 |
| X-Ray of Shoulder, Minimum of 2 Views73030 | 17 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 4 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Meloxicam | 98 | 42 |
| Celecoxib | 27 | — |
| Methylprednisolone | 20 | 19 |
| Tramadol Hcl | 14 | — |
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 no Part D record, 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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-04-21
- Last updated
- 2025-07-14
- Certified
- 2025-07-14
Frequently asked questions
- What is Robert O'Hollaren's NPI number?
- Robert O'Hollaren's National Provider Identifier (NPI) is 1801852710, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert O'Hollaren's specialty?
- Robert O'Hollaren is listed in the NPPES registry with a primary specialty of Adult Reconstructive Orthopaedic Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Robert O'Hollaren located?
- Robert O'Hollaren's practice location on file with NPPES is 3525 Loma Vista Rd Ste a, Ventura, CA 93003-3165.
- What is Robert O'Hollaren's phone number?
- The practice phone number listed in the NPPES registry for Robert O'Hollaren is (805) 641-6415.
- Does Robert O'Hollaren accept Medicare?
- Robert O'Hollaren is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Robert O'Hollaren's NPI active?
- Yes — Robert O'Hollaren's NPI (1801852710) is active in the NPPES registry as of the last update on 2025-07-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.