What is Robert O'hollaren's specialty?

Robert O'hollaren (NPI 1801852710) is a Medicare-billing provider whose primary specialty is Orthopedic Surgery in Ventura, CA.

Where does Robert O'hollaren practice?

Robert O'hollaren practices in Ventura, CA, based on the location reported in the CMS Medicare provider datasets for NPI 1801852710.

How much does Medicare pay Robert O'hollaren?

Robert O'hollaren (NPI 1801852710) received approximately $46K in total Medicare Part B payments, serving 122 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1801852710

Robert O'hollarenM.D.

PRACTICEVENTURA ORTHOPEDICS MEDICAL GROUP, INC.See all providers at this practice →

Orthopedic SurgeryVentura, CAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

332

Unique beneficiaries

—

Total services

603

Distinct HCPCS

Medicare payment

$34K

Peer benchmark

Total Medicare services vs. 1,921 Orthopedic Surgery providers in CA — top quintile (cohort median 1,100).

PRESCRIBING · PART D · 2024

Total Rx claims

159

Beneficiaries

—

Total drug cost

$1K

Distinct drugs

Brand share

0.0%

Top prescribed drugs

Meloxicam98 claims

Celecoxib27 claims

Methylprednisolone20 claims

Tramadol Hcl14 claims

QUALITY · MIPS · 2024

Final MIPS score

73.8

Quality

31.9

Cost

82.4

Improvement activities

40.0

Promoting interop.

98.0

Payment adjustment

-0.15%

Group

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

No data available for this provider in 2025.

REFERRAL NETWORK

Where Robert O'hollaren's patients come from & go

Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 7 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
COMMUNITY MEMORIAL HEALTH SYSTEM	82	267
Unilab Corporation Clinical Laboratory · West Hills, CA	71	274
T Surgery Center, Llc Ambulatory Surgical Center · Ventura, CA	39	56
BACON, MERRILL	38	61
Irwin Grossman Diagnostic Radiology · Oxnard, CA	14	22
Jennifer Kosek Diagnostic Radiology · Santa Barbara, CA	12	27
Nicholas Hanson Diagnostic Radiology · Salem, OR	11	19

Refers patients to

Outbound — where patients go next

No outbound pairs above the suppression threshold.

Source: CMS Physician Shared Patient Patterns (30-day window, Medicare FFS). Direction = a beneficiary seen by the first provider, then the second, within 30 days; a proxy for referral, not a documented referral. Pairs with fewer than 11 shared beneficiaries are suppressed.

CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore

OIG/SAM exclusion screening, sanctions history

Healthparse Signals

Monitor this provider for changes — dated NPI change events