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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. OKWUDILI NNAJI M D
NPI 1912144403
Internal Medicine - Nephrology in Brooklyn, NY

Active since January 21, 2009PECOS EnrolledAccepts Medicare Assignment
93.49/100
CMS Quality Rating
450 CLARKSON AVE, BROOKLYN, NY 11203(718) 270-2848 Get Directions Write a Review

NPPES record last updated: June 10, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Jul 21, 2022, Jul 17, 2017 (2 updates tracked since 2017).

About Dr. Okwudili Nnaji M D NPPES

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

DR. OKWUDILI NNAJI M D (NPI 1912144403) is an individual nephrology provider in Brooklyn, New York, licensed in New York (273307) and active in the NPI registry since January 2009. He is enrolled in Medicare PECOS, is affiliated with Suny/downstate University Hospital Of Brooklyn, and is a graduate of Other (1992).

NPPES Registry Identity

NPI1912144403
Entity TypeIndividualMale
Primary Taxonomy207RN0300X
Provider Legal NameDR. OKWUDILI NNAJICredential: M D
Location Address450 CLARKSON AVEBrooklyn, NY 11203-2012
Mailing Address4777 N Diversey BlvdWhitefish Bay, WI 53211-1012 · (718) 809-2689
Phone(718) 270-2848
Sole ProprietorNo
Medical School CMSOtherGraduated 1992
Enumeration DateJanuary 21, 2009
Last NPPES UpdateJune 10, 20262 updates tracked since enumeration
NPPES CertifiedJune 10, 2026
✔ NPI 1912144403 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · NephrologyAllopathic & Osteopathic Physicians
Taxonomy Code207RN0300X
License✔ Licensed in NY · 273307
Definition
An internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.
450 CLARKSON AVE, Brooklyn, NY 11203
Open in Google Maps ↗

Other Identifiers 2

OtherK400135659WI · Medicare Ptan
OtherK400135656WI · Medicare Ptan

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. Okwudili Nnaji 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 ID8224171475
PECOS Enrollment IDI20200330000477
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 5

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.

Hemodialysis procedure with physician evaluation 90935
Hemodialysis is a treatment that uses a machine to filter waste and excess fluid from your blood when your kidneys can't. A physician checks your health before, during, and after the procedure to ensure it's working effectively for you.
119 services52 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.
68 services34 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.
28 services26 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.
23 services18 patients
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.
19 services15 patients

Hospital Affiliations CMS Care Compare

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

Suny/Downstate University Hospital Of Brooklyn

Acute Care Hospitals · Brooklyn, NY
1/5 CMS rating
OwnershipGovernment - State
CMS Certification Number330350
Location445 Lenox RoadBrooklyn, NY 11203 · Kings County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 11203 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.

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.

93.49/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality72.62
Promoting Interoperability90.58
Improvement Activities40

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.

Tacrolimus, immediate release, oral, 1 mg J7507
Treatment-Treatment - Miscellaneous · category RX029N
2 suppliers20 claims3,150 services$0.28 avg. paid by Medicare
Prednisone, immediate release or delayed release, oral, 1 mg J7512
Treatment-Treatment - Miscellaneous · category RX029N
2 suppliers17 claims2,550 services$0.01 avg. paid by Medicare
Pharmacy supply fee for oral anti-cancer, oral anti-emetic or immunosuppressive drug(s); for the first prescription in a 30-day period Q0511
Treatment-Chemotherapy · category RH012N
2 suppliers17 claims17 services$17.77 avg. paid by Medicare
Pharmacy supply fee for oral anti-cancer, oral anti-emetic or immunosuppressive drug(s); for a subsequent prescription in a 30-day period Q0512
Treatment-Chemotherapy · category RH012N
2 suppliers22 claims25 services$12.09 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 20

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

SUNY DOWNSTATE MEDICAL CENTER UHB
Obstetrics & Gynecology
450 CLARKSON AVE
BROOKLYN, NY 11203
Kings County (718) 363-2908
UNIVERSITY PHYSICIANS OF BROOKLYN
Internal Medicine (Gastroenterology)
450 CLARKSON AVE, SUITE A
BROOKLYN, NY 11203
Kings County (718) 270-1112
SNEHALATA R TOPGI MD
Emergency Medicine
450 CLARKSON AVE
BROOKLYN, NY 11203
Kings County (718) 270-3295
DR. MARYAM NOORI KOLOORI M.D.
Student in an Organized Health Care Education/Training Program
450 CLARKSON AVE, SUNY DOWNSTATE MEDICAL CENTER
BROOKLYN, NY 11203
Kings County (412) 737-3789
DR. VIVEK YADAV MD
Internal Medicine (Pulmonary Disease)
450 CLARKSON AVE
BROOKLYN, NY 11203
Kings County (718) 270-3302
DR. DANIEL BEEGAN MD
Family Medicine
450 CLARKSON AVE, MSC 67
BROOKLYN, NY 11203
Kings County (718) 270-4096
ELIEZER LEVITANSKY DO
Emergency Medicine
450 CLARKSON AVE
BROOKLYN, NY 11203
Kings County (245) 331-8718
MIGUEL ANGEL BARRIOS MD
Emergency Medicine
450 CLARKSON AVE
BROOKLYN, NY 11203
Kings County (718) 245-4798

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 Okwudili Nnaji's NPI number?

The NPI number for Okwudili Nnaji is 1912144403. It was assigned to this individual provider in the NPPES registry on January 21, 2009.

Where is Okwudili Nnaji located?

Okwudili Nnaji practices at 450 Clarkson Ave, Brooklyn, NY 11203. The listed phone number is (718) 270-2848.

What is Okwudili Nnaji's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

Is Okwudili Nnaji enrolled in Medicare?

Yes. Okwudili Nnaji 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 Okwudili Nnaji affiliated with any hospitals?

According to CMS data, Okwudili Nnaji is affiliated with Suny/Downstate University Hospital Of Brooklyn.

When was this NPI record last updated?

The NPPES record for Okwudili Nnaji was last updated on June 10, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 57 days 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.