2026 NPPES data Neurological Surgery Physician NPI 1891950788 M.D.
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REZA KARIMI, M.D.

Neurological Surgery Physician in PARAMUS, New Jersey. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
Prescribing volume
131
Medicare Part D claims · 36 beneficiaries · Neurological Surgery Physician avg: 181
Generic prescribing
37%
generic claims · 63% brand-name · higher generic rates reduce patient out-of-pocket costs

What the federal data shows

REZA KARIMI, M.D. filed 131 Medicare Part D claims in 2023 as a Neurological Surgery Physician in PARAMUS, New Jersey, prescribing 37% generic.

131
Part D claims, 2023
37%
generic prescribing
Likely
board-certified (heuristic)

Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) — no proprietary rating or editorial opinion is applied.

REZA KARIMI, M.D.'s Medicare Part D volume vs every U.S. prescriber

Total Medicare Part D claims, 2023 — across all CMS prescribers nationally

131 35th percentile higher than 35% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). This entry sits in this band. 200–400: 182,923 prescribers (13%). Above this entry. 400–600: 90,619 prescribers (7%). Above this entry. 600–800: 56,224 prescribers (4%). Above this entry. 800–1,000: 40,919 prescribers (3%). Above this entry. 1,000–1,200: 31,827 prescribers (2%). Above this entry. 1,200–1,400: 26,224 prescribers (2%). Above this entry. 1,400–1,600: 21,710 prescribers (2%). Above this entry. 1,600–1,800: 19,072 prescribers (1%). Above this entry. 1,800–2,000: 16,451 prescribers (1%). Above this entry. 2,000–2,200: 213,991 prescribers (16%). Above this entry. This provider 0 2K+ every Part D prescriber (claims/yr), bucketed by value

Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source CMS Medicare Part D Prescriber Public Use File · 2023

Board certification likely (heuristic — not verified)

REZA KARIMI, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation — signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).

What does the federal data show about REZA KARIMI, M.D.?

Quality data not reported

NPI registry status

Active

Issued 07/21/2008

NPI 1891950788

Primary specialty

Neurological Surgery Physician

Mid-sized

8,100 US NPIs in this specialty

Medicare Part D claims

131 28% vs specialty avg

2023 prescription claims

Specialty avg: 181

Specialty distribution in New Jersey

How Neurological Surgery Physician compares to other specialties among New Jersey providers

New Jersey providers

Neurological Surgery Physician share within New Jersey

1. Neurological Surgery Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Neurological Surgery Physician share within New Jersey

Specialty board-certification context

Estimated specialty board-certified rate — Neurological Surgery Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Neurological Surgery Physician ABMS/AOA estimate

Est. board-certified rate (Neurological Surgery Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Neurological Surgery Physician) — ABMS / AOA estimate

The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.

Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).

REZA KARIMI, M.D. appears in the CMS NPPES registry as a Neurological Surgery Physician provider holding M.D. credentials at 650 FROM RD STE 220, PARAMUS, NJ, 07652, with a listed phone of (201) 342-2550. NPI 1891950788 was issued on 07/21/2008. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what KARIMI most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 131 prescription claims written by this provider, covering 36 Medicare beneficiaries and totaling roughly $49K in drug spend, split 63% brand-name and 37% generic by claim count. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

Neurological Surgery Physician is a mid-sized specialty nationwide, with 8,100 enrolled providers across 53 states and an average of 181 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline. Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist — always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.

Practice Address

650 FROM RD STE 220
PARAMUS, NJ 07652

Provider Details

NPI 1891950788
Specialty Neurological Surgery Physician
Credentials M.D.
Gender Male
NPI Issued 07/21/2008

Hospital and facility affiliations

Facilities where REZA KARIMI, M.D. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" — a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.

NEW JERSEY BRAIN AND SPINE PC
MONTVALE, NJ

Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).

Brand vs generic prescribing mix · Brand-heavy

REZA KARIMI, M.D. — brand share 63.0%
Specialty average (est.)

63% brand-name claims vs 37% generic, on 131 2023 Medicare Part D claims.

The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.

Medicare Part D Prescribing Data

CMS Medicare Part D prescriber-level data for calendar year 2023.

131
Total Claims
$49K
Total Drug Cost
36
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
177
Total Day Supply
4,955
Brand vs Generic
63% brand / 37% generic
Brand Drug Cost
$48K
Generic Drug Cost
$1K

Patient Demographics

Average Patient Age
72.3 years
Avg HCC Risk Score
1.47
Gender Split
64% female / 36% male

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

What REZA KARIMI, M.D. prescribes most

Top Medicare Part D drugs by claim count, 2023

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2023
Drug Claims
Brilinta
Ticagrelor
80
Clopidogrel
Clopidogrel Bisulfate
12
Pregabalin
11

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

Neurological Surgery Physician Overview

How REZA KARIMI, M.D. fits within the Neurological Surgery Physician landscape nationally.

8,100
Neurological Surgery Physician Providers in US
53
States with Neurological Surgery Physician
181
Avg Claims per Provider

REZA KARIMI, M.D.'s 131 claims are below the specialty average of 181.

Nearby Neurological Surgery Physician Providers in New Jersey

Other clinicians with the same primary specialty enrolled in New Jersey, drawn from the same CMS NPPES roster as KARIMI.

Compare Neurological Surgery Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is REZA KARIMI, M.D.'s specialty?
REZA KARIMI, M.D. specializes in Neurological Surgery Physician and practices in PARAMUS, New Jersey. Credentials: M.D..
How much does REZA KARIMI, M.D. prescribe under Medicare Part D?
In 2023, REZA KARIMI, M.D. wrote 131 Medicare Part D claims totaling $49K in drug costs for 36 beneficiaries.
Where is REZA KARIMI, M.D. located?
REZA KARIMI, M.D. is located at 650 FROM RD STE 220, PARAMUS, NJ, 07652. Phone: (201) 342-2550.
What is REZA KARIMI, M.D.'s NPI number?
REZA KARIMI, M.D.'s National Provider Identifier (NPI) is 1891950788, issued on 07/21/2008.
Does REZA KARIMI, M.D. prescribe more brand-name or generic drugs?
REZA KARIMI, M.D.'s prescribing is 63% brand-name and 37% generic drugs by claim count, with $48K in brand drug costs.
How many Neurological Surgery Physician providers are there in the US?
There are 8,100 Neurological Surgery Physician providers across 53 states in the US. The average Neurological Surgery Physician provider writes 181 Medicare Part D claims per year.
What drugs does REZA KARIMI, M.D. prescribe most often?
Based on 2023 Medicare Part D data, REZA KARIMI, M.D.'s most frequently prescribed drugs include Brilinta, Clopidogrel, Pregabalin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does REZA KARIMI, M.D. accept Medicare?
REZA KARIMI, M.D. appears in CMS Medicare data with 131 Part D claims and 36 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify REZA KARIMI, M.D.'s credentials?
REZA KARIMI, M.D.'s NPI is 1891950788 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.

Data Sources

Provider Directory
CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
Specialty Classification
NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
Prescribing Data
CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
Limitations
Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.

See our complete data methodology for details on how we collect and process government data.

Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).

Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology