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DR. GARY C PIEN MD, PHD
NPI 1841404530
Allergy & Immunology in Berkeley Heights, NJ

Active since May 10, 2007PECOS EnrolledAccepts Medicare Assignment
1 DIAMOND HILL RD, BERKELEY HEIGHTS, NJ 07922(908) 273-4300 Get Directions Write a Review

NPPES record last updated: February 18, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Dr. Gary C Pien Md, Phd NPPES

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

DR. GARY C PIEN MD, PHD (NPI 1841404530) is an individual allergy & immunology provider in Berkeley Heights, New Jersey, licensed in New Jersey (25MA08470800) and active in the NPI registry since May 2007. He is enrolled in Medicare PECOS, is affiliated with Overlook Medical Center, and is a graduate of Other (2003).

NPPES Registry Identity

NPI1841404530
Entity TypeIndividualMale
Primary Taxonomy207K00000X
Provider Legal NameDR. GARY C PIENCredential: MD, PHD
Location Address1 DIAMOND HILL RDBerkeley Heights, NJ 07922-2104
Mailing Address1 Diamond Hill RdBerkeley Heights, NJ 07922-2104 · (908) 273-4300
Phone(908) 273-4300
Sole ProprietorNo
Medical School CMSOtherGraduated 2003
Enumeration DateMay 10, 2007
Last NPPES UpdateFebruary 18, 2026
NPPES CertifiedFebruary 18, 2026
✔ NPI 1841404530 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyAllergy & ImmunologyAllopathic & Osteopathic Physicians
Taxonomy Code207K00000X
License✔ Licensed in NJ · 25MA08470800
Definition
An allergist-immunologist is trained in evaluation, physical and laboratory diagnosis, and management of disorders involving the immune system. Selected examples of such conditions include asthma, anaphylaxis, rhinitis, eczema, and adverse reactions to drugs, foods, and insect stings as well as immune deficiency diseases (both acquired and congenital), defects in host defense, and problems related to autoimmune disease, organ transplantation, or malignancies of the immune system.
Also ListedPediatricsTaxonomy 208000000X · License 25MA08470800 (NJ)
1 DIAMOND HILL RD, Berkeley Heights, NJ 07922
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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. Gary C Pien Md, Phd 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 ID6002985140
PECOS Enrollment IDI20090424000281
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.

Professional service for preparation and provision of 1 or more antigens 95165
This service involves the creation and supply of antigens, substances that stimulate your immune system to fight diseases. These antigens can be used in vaccines or allergy tests to help your body build defenses against specific health threats.
292 services26 patients
Professional service for multiple injections of allergen 95117
The professional service for multiple injections of allergens involves administering small doses of specific allergens into your body. This is done to help your immune system become less sensitive to them, reducing your allergic reaction over time. It's a safe, effective way to manage allergies.
170 services30 patients
Test for allergy using allergenic extract 95004
An allergy test with allergenic extract is a diagnostic method to identify substances causing allergic reactions. Small amounts of common allergens are introduced to your body, usually through skin pricks or blood tests. Your body's response helps determine your allergies.
115 services17 patients
Test for allergy using combination of methods with drug or biological 95018
An allergy test with a drug or biological involves multiple methods. Skin tests may be performed where small amounts of allergens are introduced to the skin. Blood tests measure your immune system's response to specific allergens. These tests help identify what substances you're allergic to.
83 services21 patients
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203
This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.
52 services52 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.
47 services42 patients

Hospital Affiliations CMS Care Compare

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

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

Referred Medical Equipment & Supplies CMS DME claims 4

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

Supplies for maintenance of non-insulin drug infusion catheter, per week (list drugs separately) A4221
DME-Other DME · category DE017N
3 suppliers51 claims183 services$18.41 avg. paid by Medicare
Injection, immune globulin (hizentra), 100 mg J1559
Treatment-Injections and Infusions (nononcologic) · category RI008N
3 suppliers51 claims15,280 services$9.52 avg. paid by Medicare
Injection, immune globulin, (octagam), intravenous, non-lyophilized (e.g., liquid), 500 mg J1568
Treatment-Injections and Infusions (nononcologic) · category RI008N
1 supplier12 claims1,200 services$33.09 avg. paid by Medicare
Supplies for external non-insulin drug infusion pump, syringe type cartridge, sterile, each K0552
DME-Other DME · category DE000N
3 suppliers48 claims202 services$2.38 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 20

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

SILPA GADIRAJU M.D.
Internal Medicine (Endocrinology, Diabetes & Metabolism)
1 DIAMOND HILL RD
BERKELEY HEIGHTS, NJ 07922
Union County (908) 273-4300
DR. JOHN H DOKKO DO
Internal Medicine (Nephrology)
1 DIAMOND HILL RD, SUMMIT MEDICAL GROUP
BERKELEY HEIGHTS, NJ 07922
Union County (908) 273-4300
DENISE RIZZOLO PA
Physician Assistant
1 DIAMOND HILL RD, SUMMIT MEDICAL GROUP
BERKELEY HEIGHTS, NJ 07922
Union County (908) 273-4300
MARIA F DOMINGUEZ BERMEO MD
Family Medicine
1 DIAMOND HILL RD
BERKELEY HEIGHTS, NJ 07922
Union County (908) 219-6940
DR. LAWRENCE J NASTRO MD
Internal Medicine (Infectious Disease)
1 DIAMOND HILL RD, SUMMIT MEDICAL GROUP
BERKELEY HEIGHTS, NJ 07922
Union County (908) 273-4300
DEBRA A RYAN PT
Physical Therapist
1 DIAMOND HILL RD, SUMMIT MEDICAL GROUP
BERKELEY HEIGHTS, NJ 07922
Union County (908) 273-4300
CHRISTOPHER M BONI DO
Internal Medicine
1 DIAMOND HILL RD
BERKELEY HEIGHTS, NJ 07922
Union County (908) 277-8683
LAUREN BARON P.A.
Physician Assistant (Medical)
1 DIAMOND HILL RD
BERKELEY HEIGHTS, NJ 07922
Union County (908) 277-8880

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 Gary Pien's NPI number?

The NPI number for Gary Pien is 1841404530. It was assigned to this individual provider in the NPPES registry on May 10, 2007.

Where is Gary Pien located?

Gary Pien practices at 1 Diamond Hill Rd, Berkeley Heights, NJ 07922. The listed phone number is (908) 273-4300.

What is Gary Pien's specialty?

The primary specialty registered for this NPI is Allergy & Immunology with taxonomy code 207K00000X.

Is Gary Pien enrolled in Medicare?

Yes. Gary Pien 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.

Is Gary Pien affiliated with any hospitals?

According to CMS data, Gary Pien is affiliated with Overlook Medical Center.

When was this NPI record last updated?

The NPPES record for Gary Pien was last updated on February 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.