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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

DR. ROBERT MORRIS O'HOLLAREN M.D.
NPI 1801852710
Orthopaedic Surgery - Adult Reconstructive Orthopaedic Surgery in Ventura, CA

Active since April 21, 2006PECOS Enrolled
1191 CHURCH ST, VENTURA, CA 93001(805) 320-6761 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Jul 13, 2026, Mar 7, 2023, Oct 1, 2022 and 7 more (10 updates tracked since 2016).

About Dr. Robert Morris O'hollaren M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. ROBERT MORRIS O'HOLLAREN M.D. (NPI 1801852710) is an individual adult reconstructive orthopaedic surgery provider in Ventura, California, licensed in California (G39131) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS and is a graduate of University Of Southern California Keck School Of Medicine (1977).

NPPES Registry Identity

NPI1801852710
Entity TypeIndividualMale
Primary Taxonomy207XS0114X
Provider Legal NameDR. ROBERT MORRIS O'HOLLARENCredential: M.D.
Location Address1191 CHURCH STVentura, CA 93001-2148
Mailing Address1191 Church StVentura, CA 93001-2148 · (805) 320-6761
Phone(805) 320-6761
Sole ProprietorNo
Medical School CMSUniversity Of Southern California Keck School Of MedicineGraduated 1977
Enumeration DateApril 21, 2006
Last NPPES UpdateJuly 13, 202610 updates tracked since enumeration
NPPES CertifiedJuly 13, 2026
✔ NPI 1801852710 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOrthopaedic Surgery · Adult Reconstructive Orthopaedic SurgeryAllopathic & Osteopathic Physicians
Taxonomy Code207XS0114X
License✔ Licensed in CA · G39131
Definition
Recognized by several state medical boards as a fellowship subspecialty program of orthopaedic surgery, adult reconstructive orthopaedic surgeons deal with reconstructive procedures such as joint arthroplasty (i.e., hip and knee), osteotomy, arthroscopy, soft-tissue reconstruction, and a variety of other adult reconstructive surgical procedures.
1191 CHURCH ST, Ventura, CA 93001
Open in Google Maps ↗

Other Identifiers 1

OtherG39131CA · State License

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Robert Morris O'hollaren M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID143120097
PECOS Enrollment IDI20100201000046
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 10

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
159 services86 patients
Injection, betamethasone acetate 3 mg and betamethasone sodium phosphate 3 mg J0702
This injection contains two medications, betamethasone acetate and betamethasone sodium phosphate. It is used to reduce inflammation and pain. It's given by a healthcare professional, often directly into the area causing discomfort.
142 services45 patients
Aspiration and/or injection of fluid from large joint 20610
This procedure involves using a needle to remove (aspiration) or introduce (injection) fluid into a large joint like the knee or hip. It can help diagnose conditions, relieve discomfort, or deliver medication directly to the joint.
111 services54 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
82 services49 patients
X-ray of knee, 4 or more views 73564
An X-ray of the knee, 4 or more views, is a non-invasive imaging test. It involves capturing multiple images of your knee from different angles. This helps in diagnosing conditions such as fractures, arthritis, or infections. The procedure is quick and painless.
36 services28 patients
X-ray of lower and sacral spine, 2-3 views 72100
An X-ray of the lower and sacral spine involves capturing images of your lower back area, including the tailbone. This procedure helps in identifying problems like fractures, infections, or deformities. 2-3 different angle views provide a comprehensive picture.
17 services17 patients

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Robert O'hollaren's NPI number?

The NPI number for Robert O'hollaren is 1801852710. It was assigned to this individual provider in the NPPES registry on April 21, 2006.

Where is Robert O'hollaren located?

Robert O'hollaren practices at 1191 Church St, Ventura, CA 93001. The listed phone number is (805) 320-6761.

What is Robert O'hollaren's specialty?

The primary specialty registered for this NPI is Orthopaedic Surgery, specializing in Adult Reconstructive Orthopaedic Surgery, with taxonomy code 207XS0114X.

Is Robert O'hollaren enrolled in Medicare?

Yes. Robert O'hollaren is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

When was this NPI record last updated?

The NPPES record for Robert O'hollaren was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 22 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.