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MARK R GERSHENBAUM DO
NPI 1982665782
Hospitalist in Freehold, NJ

Active since March 31, 2006PECOS Enrolled
79.37/100
CMS Quality Rating
901 WEST MAIN ST, FREEHOLD, NJ 07728(732) 294-2666(732) 431-8267 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Jul 13, 2026, Sep 11, 2025 (2 updates tracked since 2025).

About Mark R Gershenbaum Do NPPES

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

MARK R GERSHENBAUM DO (NPI 1982665782) is an individual hospitalist provider in Freehold, New Jersey, licensed in New Jersey (25MB04672200) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1982665782
Entity TypeIndividualMale
Primary Taxonomy208M00000X
Provider Legal NameMARK R GERSHENBAUMCredential: DO
Location Address901 WEST MAIN STFreehold, NJ 07728
Mailing AddressPo Box 13700-1901Philadelphia, PA 19191-1901 · (800) 777-2455 · Fax (610) 617-6280
Phone(732) 294-2666
Fax(732) 431-8267
Sole ProprietorNo
Enumeration DateMarch 31, 2006
Last NPPES UpdateJuly 13, 20262 updates tracked since enumeration
✔ NPI 1982665782 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyHospitalistAllopathic & Osteopathic Physicians
Taxonomy Code208M00000X
License✔ Licensed in NJ · 25MB04672200
Definition
Hospitalists are physicians whose primary professional focus is the general medical care of hospitalized patients. Their activities include patient care, teaching, research, and leadership related to Hospital Medicine. The term 'hospitalist' refers to physicians whose practice emphasizes providing care for hospitalized patients.
Also ListedFamily MedicineTaxonomy 207Q00000X · License 25MB04672200 (NJ)
901 WEST MAIN ST, Freehold, NJ 07728
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Other Identifiers 2

Medicaid5453101NJ
OtherP00153530Railroad Medicare

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include 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 (PECOS)

Mark R Gershenbaum Do is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Reassignment

Medicare enrollment records show Mark Gershenbaum reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Freehold Hospitalists, LLC
2.9 mi
Hospitalist
4255 ROUTE 9 N, BLDG 5, SUITE B
Freehold, NJ 07728
  • Reassigned Medicare billing, New Jersey enrollment
  • 31 clinicians in this Medicare group
NPI 1831231463 (732) 255-2252

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 4

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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
610 services212 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
175 services162 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
171 services107 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
147 services143 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 07728 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
$140.34 typical visit price
range $61.59 – $185.05
Typical copayment $35.08 (range $15.39 – $46.26)
Most-billed visit code 99204
Established Patient
$107.94 typical visit price
range $20.08 – $150.98
Typical copayment $26.98 (range $5.02 – $37.74)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

79.37/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality62.08
Improvement Activities40
Cost65.14

Referred Medical Equipment & Supplies CMS DME claims

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Hospital bed, semi-electric (head and foot adjustment), with any type side rails, with mattress E0260
DME-Hospital Beds · category DB000N
2 suppliers14 claims14 services$42.83 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 2

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

WILLIAM HOWARD ROSS DO
Hospitalist
901 WEST MAIN ST
FREEHOLD, NJ 07728
Monmouth County (732) 294-2666
CJE HOSPITALIST ASSOCIATES LLC
Hospitalist
901 WEST MAIN ST, CENTRASTATE MEDICAL CENTER
FREEHOLD, NJ 07728
Monmouth County (732) 294-2666

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 Mark Gershenbaum's NPI number?

The NPI number for Mark Gershenbaum is 1982665782. It was assigned to this individual provider in the NPPES registry on March 31, 2006.

Where is Mark Gershenbaum located?

Mark Gershenbaum practices at 901 West Main St, Freehold, NJ 07728. The listed phone number is (732) 294-2666.

What is Mark Gershenbaum's specialty?

The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.

Is Mark Gershenbaum enrolled in Medicare?

Yes. Mark Gershenbaum is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Mark Gershenbaum's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mark Gershenbaum reassigns Medicare benefits to Freehold Hospitalists, LLC (Freehold, NJ). The 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 Mark Gershenbaum's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Mark Gershenbaum accept?

Health plans from Oscar Health list Mark Gershenbaum 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 Mark Gershenbaum 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 3 months 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.