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DR. WILLIAM T. O'BRIEN SR. D.O.
NPI 1316046899
Radiology - Diagnostic Radiology in Orlando, FL

Active since September 21, 2006PECOS EnrolledAccepts Medicare Assignment
52 W UNDERWOOD ST, ORLANDO, FL 32806(321) 842-8475 Get Directions Write a Review

NPPES record last updated: March 30, 2023. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Mar 30, 2023, Mar 17, 2018, Feb 20, 2018 and 2 more (5 updates tracked since 2017).

About Dr. William T. O'brien Sr. D.o. NPPES

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

DR. WILLIAM T. O'BRIEN SR. D.O. (NPI 1316046899) is an individual diagnostic radiology provider in Orlando, Florida, licensed in Florida (OS18400) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS and is a graduate of Philadelphia College Of Osteopathic Medicine (2003).

NPPES Registry Identity

NPI1316046899
Entity TypeIndividualMale
Primary Taxonomy2085R0202X
Provider Legal NameDR. WILLIAM T. O'BRIEN SR.Credential: D.O.
Location Address52 W UNDERWOOD STOrlando, FL 32806-1110
Mailing Address52 W Underwood StOrlando, FL 32806-1110 · (321) 842-8475
Phone(321) 842-8475
Sole ProprietorYes
Medical School CMSPhiladelphia College Of Osteopathic MedicineGraduated 2003
Enumeration DateSeptember 21, 2006
Last NPPES UpdateMarch 30, 20235 updates tracked since enumeration
NPPES CertifiedMarch 30, 2023
✔ NPI 1316046899 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyRadiology · Diagnostic RadiologyAllopathic & Osteopathic Physicians
Taxonomy Code2085R0202X
Licenses✔ Licensed in FL · OS18400✔ Licensed in OH · 34.012588✔ Licensed in CA · 9181
Definition
A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.
Also ListedRadiology · NeuroradiologyTaxonomy 2085N0700X · License 34.012588 (OH)
Also ListedRadiology · Pediatric RadiologyTaxonomy 2085P0229X · License 34.012588 (OH)
52 W UNDERWOOD ST, Orlando, FL 32806
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Other Identifiers 4

Medicaid113224700FL
OtherC33FEFL · Bcbs
OtherPF372FL · Medicare Ptan Ohri
OtherPS818FL · Medicare Ptan Ohmg

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Molina Healthcare.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. William T. O'brien Sr. D.o. 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 ID8527379353
PECOS Enrollment IDI20220617000629
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.

Medicare Billing Reassignments

2

Medicare enrollment records show William O'brien reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Orlando Health Medical Group Inc
Same address
Internal Medicine
52 W UNDERWOOD ST
Orlando, FL 32806
  • Reassigned Medicare billing, Florida enrollment
  • 3,290 clinicians in this Medicare group
NPI 1669429577 (321) 841-2452
Ohri, LLC
0.1 mi
Radiology
60 W. COLUMBIA STREET
Orlando, FL 32806
  • Reassigned Medicare billing, Florida enrollment
  • 269 clinicians in this Medicare group
NPI 1669182424 (407) 331-9355

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 32806 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$87.62 typical visit price
range $56.00 – $171.84
Typical copayment $21.90 (range $14.00 – $42.96)
Most-billed visit code 99203
Established Patient
$70.04 typical visit price
range $17.57 – $139.16
Typical copayment $17.51 (range $4.39 – $34.79)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MANDIP KAUR ARNP
Nurse Practitioner (Psychiatric/Mental Health)
52 W UNDERWOOD ST
ORLANDO, FL 32806
Orange County (407) 262-2220
MS. HELEN F. PHIPPS NP
Nurse Practitioner
52 W UNDERWOOD ST
ORLANDO, FL 32806
Orange County (352) 343-1341
AMANDA GABRIELE HERMIDA RN
Nurse Anesthetist, Certified Registered
52 W UNDERWOOD ST
ORLANDO, FL 32806
Orange County (321) 841-5111
DR. JOSEPH N FOSS MD
Radiology (Diagnostic Radiology)
52 W UNDERWOOD ST
ORLANDO, FL 32806
Orange County (321) 842-8475
KRISHNA KUMAR D.O.
Radiology (Diagnostic Radiology)
52 W UNDERWOOD ST
ORLANDO, FL 32806
Orange County (321) 842-8475
SIMONE LEMAR GOWIE-JEROME ARNP
Nurse Practitioner (Family)
52 W UNDERWOOD ST
ORLANDO, FL 32806
Orange County (321) 841-6229
NUGMA CHADHA MD
Internal Medicine
52 W UNDERWOOD ST
ORLANDO, FL 32806
Orange County (321) 841-3581
DR. LARA WOLFENDEN AGACNP
Nurse Practitioner (Adult Health)
52 W UNDERWOOD ST
ORLANDO, FL 32806
Orange County (321) 841-5111

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 William O'brien's NPI number?

The NPI number for William O'brien is 1316046899. It was assigned to this individual provider in the NPPES registry on September 21, 2006.

Where is William O'brien located?

William O'brien practices at 52 W Underwood St, Orlando, FL 32806. The listed phone number is (321) 842-8475.

What is William O'brien's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.

Is William O'brien enrolled in Medicare?

Yes. William O'brien 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.

Which organizations bill Medicare for William O'brien's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William O'brien reassigns Medicare benefits to 2 organizations: Orlando Health Medical Group Inc (Orlando, FL) and Ohri, LLC (Orlando, FL). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for William O'brien's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does William O'brien accept?

Health plans from Molina Healthcare list William O'brien as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for William O'brien was last updated on March 30, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years 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.