1. Home
  2. Directory
  3. New York
  4. Brooklyn
  5. Internal Medicine
  6. NPI Profile

DR. GEETI MAHAJAN M.D.
NPI 1538320510
Internal Medicine - Endocrinology, Diabetes & Metabolism in Brooklyn, NY

Active since June 22, 2008PECOS EnrolledAccepts Medicare Assignment
4802 10TH AVE FL 3, BROOKLYN, NY 11219(718) 283-5923(718) 283-8498 Get Directions Write a Review

NPPES record last updated: February 4, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Feb 4, 2026, May 29, 2019 (2 updates tracked since 2019).

About Dr. Geeti Mahajan M.d. NPPES

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

DR. GEETI MAHAJAN M.D. (NPI 1538320510) is an individual endocrinology, diabetes & metabolism provider in Brooklyn, New York, licensed in New York (309583) and active in the NPI registry since June 2008. She is enrolled in Medicare PECOS, is affiliated with Maimonides Medical Center, and is a graduate of Other (2006).

NPPES Registry Identity

NPI1538320510
Entity TypeIndividualFemale
Primary Taxonomy207RE0101X
Provider Legal NameDR. GEETI MAHAJANCredential: M.D.
Location Address4802 10TH AVE FL 3Brooklyn, NY 11219-2916
Mailing Address5402 Fort Hamilton Pkwy, Fl 6Brooklyn, NY 11219 · (718) 283-8773 · Fax (718) 283-8796
Phone(718) 283-5923
Fax(718) 283-8498
Sole ProprietorNo
Medical School CMSOtherGraduated 2006
Enumeration DateJune 22, 2008
Last NPPES UpdateFebruary 4, 20262 updates tracked since enumeration
NPPES CertifiedFebruary 4, 2026
✔ NPI 1538320510 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians
Taxonomy Code207RE0101X
Licenses✔ Licensed in NY · 309583✔ Licensed in NJ · 25MA10543800
Definition
An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.
4802 10TH AVE FL 3, Brooklyn, NY 11219
Open in Google Maps ↗

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. Geeti Mahajan 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 ID4183872260
PECOS Enrollment IDI20210721000527
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 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.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
74 services47 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.
62 services31 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
24 services24 patients
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204
This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
14 services14 patients

Hospital Affiliations CMS Care Compare

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

Maimonides Medical Center

Acute Care Hospitals · Brooklyn, NY
1/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number330194
Location4802 Tenth AvenueBrooklyn, NY 11219 · Kings County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 11219 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
$154.28 typical visit price
range $67.40 – $203.53
Typical copayment $38.57 (range $16.85 – $50.88)
Most-billed visit code 99204
Established Patient
$117.62 typical visit price
range $21.66 – $164.45
Typical copayment $29.40 (range $5.41 – $41.11)
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.

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.

Supply allowance for therapeutic continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service K0553
DME-Other DME · category DE017N
7 suppliers44 claims44 services$192.09 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

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

SHENOUTY BESHARA PA-C
Physician Assistant
4802 10TH AVE FL 3
BROOKLYN, NY 11219
Kings County (718) 283-8137

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 Geeti Mahajan's NPI number?

The NPI number for Geeti Mahajan is 1538320510. It was assigned to this individual provider in the NPPES registry on June 22, 2008.

Where is Geeti Mahajan located?

Geeti Mahajan practices at 4802 10th Ave Fl 3, Brooklyn, NY 11219. The listed phone number is (718) 283-5923.

What is Geeti Mahajan's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

Is Geeti Mahajan enrolled in Medicare?

Yes. Geeti Mahajan 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 Geeti Mahajan affiliated with any hospitals?

According to CMS data, Geeti Mahajan is affiliated with Maimonides Medical Center.

When was this NPI record last updated?

The NPPES record for Geeti Mahajan was last updated on February 4, 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.