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O'NEIL R MASON M.D.
NPI 1699046748
Internal Medicine - Cardiovascular Disease in Morristown, NJ

Active since January 21, 2012PECOS EnrolledAccepts Medicare Assignment
100 MADISON AVE, MORRISTOWN, NJ 07960(973) 971-7416(973) 401-2470 Get Directions Write a Review

NPPES record last updated: September 1, 2022. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Sep 1, 2022, Jun 25, 2020, Feb 11, 2016 (3 updates tracked since 2016).

About O'neil R Mason M.d. NPPES

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

O'NEIL R MASON M.D. (NPI 1699046748) is an individual cardiovascular disease provider in Morristown, New Jersey, licensed in New Jersey (25MA11494000) and active in the NPI registry since January 2012. He is enrolled in Medicare PECOS, is affiliated with Morristown Medical Center, and maintains a secondary practice location in Chicago.

NPPES Registry Identity

NPI1699046748
Entity TypeIndividualMale
Primary Taxonomy207RC0000X
Provider Legal NameO'NEIL R MASONCredential: M.D.
Location Address100 MADISON AVEMorristown, NJ 07960-6136
Mailing AddressPo Box 416457Boston, MA 02241-6457 · (844) 362-1735 · Fax (973) 290-7495
Phone(973) 971-7416
Fax(973) 401-2470
Sole ProprietorYes
Medical School CMSOtherGraduated 2005
Enumeration DateJanuary 21, 2012
Last NPPES UpdateSeptember 1, 20223 updates tracked since enumeration
NPPES CertifiedSeptember 1, 2022
✔ NPI 1699046748 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Cardiovascular DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RC0000X
Licenses✔ Licensed in NJ · 25MA11494000✔ Licensed in IL · 036152383
Definition
An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms.
Also ListedInternal MedicineTaxonomy 207R00000X · License 266546 (NY)
100 MADISON AVE, Morristown, NJ 07960
Open in Google Maps ↗

Secondary Practice Location 1

Location 1676 N Saint Clair StChicago, IL 60611-2927 · Phone (312) 926-2000

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter Health, Oscar Health.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

O'neil R Mason 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 ID9436455789
PECOS Enrollment IDI20220915000416
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 O'neil Mason reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Practice Associates Medical Group
Same address
Internal Medicine
100 MADISON AVENUE, INTEROFFICE #68
Morristown, NJ 07960
  • Reassigned Medicare billing, New Jersey enrollment
  • 1,699 clinicians in this Medicare group
NPI 1427016385 (844) 264-2250
Premier Health Associates LLC
22 mi
Internal Medicine
123 NEWTON SPARTA RD
Newton, NJ 07860
  • Reassigned Medicare billing, New Jersey enrollment
  • 48 clinicians in this Medicare group
NPI 1043257991 (973) 579-6300

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

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.

Ultrasound of heart with color-depicted blood flow, rate, direction and valve function 93306
This is a heart ultrasound, also known as an echocardiogram. It uses sound waves to create pictures of your heart, showing how blood flows through it. The color depicts the blood flow's speed and direction. It also checks the heart's valves to ensure they're working properly.
379 services344 patients
Ultrasound of heart with probe in esophagus during surgery on heart or great blood vessels with report 93355
This procedure, known as a transesophageal echocardiogram, involves placing a probe in your esophagus to capture detailed images of your heart during surgery. It helps surgeons monitor heart function and guide treatment. A report will follow.
170 services170 patients
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function 93306
This is a heart ultrasound, also known as an echocardiogram. It uses sound waves to create pictures of your heart, showing how blood flows through it. The color depicts the blood flow's speed and direction. It also checks the heart's valves to ensure they're working properly.
146 services144 patients
Ultrasound of heart, follow-up 93308
A follow-up ultrasound of the heart, also known as an echocardiogram, is a non-invasive test that uses sound waves to create images of your heart. It helps doctors monitor your heart's function and structures after initial assessment or treatment.
81 services74 patients
Ultrasound of heart with probe in esophagus, with report 93312
This procedure, called a transesophageal echocardiogram, uses a small probe passed into your esophagus to capture detailed images of your heart. The report provides information about your heart's structure and function.
60 services58 patients
Ultrasound of heart blood flow, valves and chambers 93320
An ultrasound of your heart, also known as an echocardiogram, is a test that uses sound waves to create detailed images of your heart. It helps doctors check the health of your heart's chambers, valves, and blood flow.
58 services57 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Morristown Medical Center

Acute Care Hospitals · Morristown, NJ
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number310015
Location100 Madison AveMorristown, NJ 07960 · Morris County
Emergency services Birthing friendly

Overlook Medical Center

Acute Care Hospitals · Summit, NJ
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number310051
Location99 Beauvoir AvenueSummit, NJ 07901 · Union County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 07960 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
$144.86 typical visit price
range $63.84 – $190.92
Typical copayment $36.21 (range $15.96 – $47.73)
Most-billed visit code 99204
Established Patient
$79.09 typical visit price
range $20.97 – $155.92
Typical copayment $19.77 (range $5.24 – $38.98)
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.

MELISSA LOPES M.D
Anesthesiology
100 MADISON AVE
MORRISTOWN, NJ 07960
Morris County (201) 943-5831
MORRISTOWN MEMORIAL HOSPITAL
General Acute Care Hospital
100 MADISON AVE
MORRISTOWN, NJ 07960
Morris County (888) 250-9947
VINCENT MAIXNER LCSW
Social Worker (Clinical)
100 MADISON AVE
MORRISTOWN, NJ 07960
Morris County (973) 971-5000
MEGAN LYNN CATHEY NP-C
Nurse Practitioner (Adult Health)
100 MADISON AVE
MORRISTOWN, NJ 07960
Morris County (973) 971-5358
ANTHONY RIZZUTI
Nurse Anesthetist, Certified Registered
100 MADISON AVE
MORRISTOWN, NJ 07960
Morris County (800) 991-9133
OMAR MOHAMMED ABDELFATTAH MBBCH
Student in an Organized Health Care Education/Training Program
100 MADISON AVE
MORRISTOWN, NJ 07960
Morris County (973) 971-5000
ALEXANDER CASCAIS MD
Student in an Organized Health Care Education/Training Program
100 MADISON AVE
MORRISTOWN, NJ 07960
Morris County (973) 971-5000
DEVEA RANI DE MD
Student in an Organized Health Care Education/Training Program
100 MADISON AVE
MORRISTOWN, NJ 07960
Morris County (973) 971-5000

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 O'neil Mason's NPI number?

The NPI number for O'neil Mason is 1699046748. It was assigned to this individual provider in the NPPES registry on January 21, 2012.

Where is O'neil Mason located?

O'neil Mason practices at 100 Madison Ave, Morristown, NJ 07960. The listed phone number is (973) 971-7416.

What is O'neil Mason's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.

Is O'neil Mason enrolled in Medicare?

Yes. O'neil Mason 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 O'neil Mason's services?

According to the CMS Revalidation Reassignment List (October 2026 release), O'neil Mason reassigns Medicare benefits to 2 organizations: Practice Associates Medical Group (Morristown, NJ) and Premier Health Associates LLC (Newton, NJ). 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 O'neil Mason's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does O'neil Mason accept?

Health plans from Ambetter Health and Oscar Health list O'neil Mason 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.

Is O'neil Mason affiliated with any hospitals?

According to CMS data, O'neil Mason is affiliated with Morristown Medical Center and Overlook Medical Center.

When was this NPI record last updated?

The NPPES record for O'neil Mason was last updated on September 1, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.