2026 NPPES data Nephrology Physician NPI 1992180806
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STEPHEN KEMNELE

Nephrology Physician in ROCKFORD, Illinois. 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
939
Medicare Part D claims · 153 beneficiaries · Nephrology Physician avg: 1K
Generic prescribing
87%
generic claims · 13% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$536.96
26 payments · CMS Open Payments (Sunshine Act)
What the federal data reveals: STEPHEN KEMNELE is a Nephrology Physician ([object Object]) practicing in ROCKFORD, Illinois with a Medicare Part D prescribing footprint of 939 claims across 153 beneficiaries — 13% brand-name prescribing . Industry payments of $536.96 across 26 transactions are disclosed under CMS Open Payments (Sunshine Act).

What stands out: STEPHEN KEMNELE filed 939 Medicare Part D claims in 2023 across ROCKFORD, Illinois. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

Board certification likely (heuristic — not verified)

STEPHEN KEMNELE 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).

STEPHEN KEMNELE at a glance

Quality data not reported

NPI registry status

Active

Issued 07/22/2015

NPI 1992180806

Primary specialty

Nephrology Physician

Mid-sized

10,534 US NPIs in this specialty

Medicare Part D claims

939 35% vs specialty avg

2023 prescription claims

Specialty avg: 1,454

Specialty distribution in Illinois

How Nephrology Physician compares to other specialties among Illinois providers

Illinois providers

Nephrology Physician share within Illinois

1. Nephrology Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Nephrology Physician share within Illinois

Specialty board-certification context

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

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

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

0%100%78%
Est. board-certified rate (Nephrology 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).

STEPHEN KEMNELE is a Nephrology Physician provider practicing in ROCKFORD, Illinois, according to the CMS National Plan and Provider Enumeration System (NPPES). NPI: 1992180806. This profile includes practice location, specialty classification, and organizational affiliations from the CMS provider registry. Provider information is self-reported to CMS and updated monthly.

STEPHEN KEMNELE appears in the CMS NPPES registry as a Nephrology Physician provider at 6940 VILLAGREEN VW, ROCKFORD, IL, 61107, with a listed phone of (779) 774-9272. NPI 1992180806 was issued on 07/22/2015. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what KEMNELE 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 939 prescription claims written by this provider, covering 153 Medicare beneficiaries and totaling roughly $94K in drug spend, split 13% brand-name and 87% 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.

Nephrology Physician is a mid-sized specialty nationwide, with 10,534 enrolled providers across 55 states and an average of 1,454 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

6940 VILLAGREEN VW
ROCKFORD, IL 61107

Provider Details

NPI 1992180806
Specialty Nephrology Physician
Gender Male
NPI Issued 07/22/2015

Hospital and facility affiliations

Facilities where STEPHEN KEMNELE 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.

GERMANE NEPHROLOGY ASSOCIATES
JOLIET, IL

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

Industry payments received (2024) — CMS Open Payments transparency data

The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for STEPHEN KEMNELE. Source: openpaymentsdata.cms.gov.

Total received

$537

Largest payer

Amgen Inc.

Most common payment type

Food and Beverage

Industry payments are not necessarily indicators of bias — they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.

License & disciplinary context — Illinois IDFPR 2023 annual report

Aggregate state board data only — NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~42K Illinois medical licensees in 2023 — they are NOT specific to STEPHEN KEMNELE. To verify STEPHEN KEMNELE's current license status, search the IDFPR public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.

106
Total board actions, Illinois 2023
Across 103 cases
2.52
Actions per 1,000 licensees
Illinois statewide rate
probation
Most common action type
38 cases

IDFPR publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Illinois disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.

Brand vs generic prescribing mix · Typical

STEPHEN KEMNELE — brand share 13.0%
Specialty average (est.)

13% brand-name claims vs 87% generic, on 939 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.

939
Total Claims
$94K
Total Drug Cost
153
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
1,447
Total Day Supply
41,380
Brand vs Generic
13% brand / 87% generic
Brand Drug Cost
$77K
Generic Drug Cost
$18K
Antibiotic Claims
23

Patient Demographics

Average Patient Age
71.9 years
Avg HCC Risk Score
3.04
Gender Split
52% female / 48% male
Age Distribution
<65: 24, 65-74: 60, 75-84: 46, 85+: 23

Top Prescribed Drugs (Medicare Part D)

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

Drug Claims
Furosemide
121
Amlodipine Besylate
116
Calcitriol
111
Allopurinol
80
Lokelma
Sodium Zirconium Cyclosilicate
45
Clonidine Hcl
41
Losartan Potassium
37
Farxiga
Dapagliflozin Propanediol
35
Hydralazine Hcl
30
Carvedilol
29

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

Nephrology Physician Overview

How STEPHEN KEMNELE fits within the Nephrology Physician landscape nationally.

10,534
Nephrology Physician Providers in US
55
States with Nephrology Physician
1,454
Avg Claims per Provider

STEPHEN KEMNELE's 939 claims are below the specialty average of 1,454.

Nearby Nephrology Physician Providers in Illinois

Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as KEMNELE.

Compare Nephrology Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is STEPHEN KEMNELE's specialty?
STEPHEN KEMNELE specializes in Nephrology Physician and practices in ROCKFORD, Illinois.
How much does STEPHEN KEMNELE prescribe under Medicare Part D?
In 2023, STEPHEN KEMNELE wrote 939 Medicare Part D claims totaling $94K in drug costs for 153 beneficiaries.
Where is STEPHEN KEMNELE located?
STEPHEN KEMNELE is located at 6940 VILLAGREEN VW, ROCKFORD, IL, 61107. Phone: (779) 774-9272.
What is STEPHEN KEMNELE's NPI number?
STEPHEN KEMNELE's National Provider Identifier (NPI) is 1992180806, issued on 07/22/2015.
Does STEPHEN KEMNELE prescribe more brand-name or generic drugs?
STEPHEN KEMNELE's prescribing is 13% brand-name and 87% generic drugs by claim count, with $77K in brand drug costs.
How many Nephrology Physician providers are there in the US?
There are 10,534 Nephrology Physician providers across 55 states in the US. The average Nephrology Physician provider writes 1,454 Medicare Part D claims per year.
What drugs does STEPHEN KEMNELE prescribe most often?
Based on 2023 Medicare Part D data, STEPHEN KEMNELE's most frequently prescribed drugs include Furosemide, Amlodipine Besylate, Calcitriol. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does STEPHEN KEMNELE accept Medicare?
STEPHEN KEMNELE appears in CMS Medicare data with 939 Part D claims and 153 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify STEPHEN KEMNELE's credentials?
STEPHEN KEMNELE's NPI is 1992180806. 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