NPI registry status
Active
2026 NPPES data Research Study Specialist NPI 1134528185 MD
Verify on CMS → Stephen Kimani, MD
Research Study Specialist in Chapel Hill, North Carolina.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 508 in Research Study Specialist, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
457
Medicare Part D claims · 84 beneficiaries · Research Study Specialist avg: 922
Generic prescribing
87%
generic claims · 13% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
92.1/100
▲ 9 pts above national avg 83.5 · Exceptional
Industry payments
$32.4
1 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Stephen Kimani, MD reported a CMS MIPS final score of 92.1/100 - above the 83.5 national average - and filed 457 Medicare Part D claims in 2024.
- 92.1/100
- MIPS score · +9 vs avg
- 457
- Part D claims, 2024
- 87%
- generic prescribing
- $32.4
- industry payments (Sunshine Act)
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.
Federal trust snapshot
What official records show about Stephen Kimani, MD
Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1134528185), first enumerated 08/15/2014.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 457 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
Reported a CMS MIPS final score of 92.1/100 in the Quality Payment Program — a federal quality measure, not a patient review.
Source: CMS Quality Payment Program
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$32.4 in reported industry payments (1 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1134528185 · Research Study Specialist
NPI-10 · ENUM-MID · TAX-NARROW · MIPS-ABOVE · RX-LIGHT · BOOK-THIN · PHOTO-FINISH
- NPI-10 1134528185
- ENUM-MID 2014
- TAX-NARROW 508
- MIPS-ABOVE 92.1/100
- RX-LIGHT 457
- BOOK-THIN 16 in North Carolina
- PHOTO-FINISH Usman Nazir · ±0.2
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Antonio Portilla…
Antonio Portilla-Cintron
75 MIPS pts
- Martin Palmer · …
Martin Palmer
81 MIPS pts
- Kerry Kilbridge …
Kerry Kilbridge
86.3 MIPS pts
- Usman Nazir · near
Usman Nazir
91.9 MIPS pts
- Kimani · this pr…
Kimani · this provider
92.1 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Stephen Kimani, MD's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
92 ≥ 66th percentile 66% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured providers. 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.
The percentile is a conservative whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
What does the federal data show about Stephen Kimani, MD?
High performer (top quartile)Primary specialty
Research Study Specialist
Medicare Part D claims
457 50% vs specialty avg
MIPS final score
92.1/100 8.6 pts vs avg
Specialty distribution in North Carolina
How Research Study Specialist compares to other specialties among North Carolina providers
Medicare quality performance, MIPS
Stephen Kimani, MD's 2023 MIPS final score plotted against the Research Study Specialist national average
- MIPS Final Score
- 92.1/100
- vs 83.5 national avg · 2023 performance year
How MIPS and board certification work
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).
Practice Address
Provider Details
| NPI | 1134528185 |
|---|---|
| Specialty | Research Study Specialist |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 08/15/2014 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
92.0664
Final Score
Measured-score avg: 83.5
85.5753
Quality
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Stephen Kimani, MD 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.
University OF North Carolina AT Chapel Hill
Chapel Hill, NC
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 Kimani, MD. Source: openpaymentsdata.cms.gov.
Total received
$32
Largest payer
Novartis Pharmaceuticals Corporation
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.
Brand vs generic prescribing mix · Typical
Stephen Kimani, MD - brand share 13.0%
Research Study Specialist average
13% brand-name claims vs 87% generic, on 457 2024 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 2024.
457
Total Claims
$511K
Total Drug Cost
84
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 725.6
- Total Day Supply
- 20,369
- Brand vs Generic
- 13% brand / 87% generic
- Brand Drug Cost
- $504K
- Generic Drug Cost
- $7K
Patient Demographics
- Average Patient Age
- 71.8 years
- Avg HCC Risk Score
- 2.20
- Gender Split
- 100% female / 0% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Stephen Kimani, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Letrozole
Letrozole
100 claims
- Tamoxifen Citrate
Tamoxifen Citrate
75 claims
- Anastrozole
Anastrozole
58 claims
- Prochlorperazine M… 20
Prochlorperazine Maleate
20 claims
- Ibrance 19
Ibrance
19 claims
- Gabapentin 18
Gabapentin
18 claims
- Ondansetron Hcl 16
Ondansetron Hcl
16 claims
- Amlodipine Besylate 12
Amlodipine Besylate
12 claims
| Drug | Claims |
|---|---|
| Letrozole | 100 |
| Tamoxifen Citrate | 75 |
| Anastrozole | 58 |
| Prochlorperazine Maleate | 20 |
| Ibrance Palbociclib | 19 |
| Gabapentin | 18 |
| Ondansetron Hcl | 16 |
| Amlodipine Besylate | 12 |
| Eliquis Apixaban | 11 |
| Exemestane | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Research Study Specialist Overview
How Stephen Kimani, MD fits within the Research Study Specialist landscape nationally.
508
Research Study Specialist Providers in US
42
States with Research Study Specialist
922
Avg Claims per Provider
Stephen Kimani, MD's 457 claims are below the specialty average of 922.
Nationwide Research Study Specialist peers with similar MIPS or enrollment year
Two federal-record peer sets for Kimani, both outside North Carolina so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (92.1 here).
Same NPPES enumeration year (2014)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Research Study Specialist Providers in North Carolina
Other clinicians with the same primary specialty enrolled in North Carolina, drawn from the same CMS NPPES roster as Kimani.
One of 16 Research Study Specialist providers enrolled in North Carolina, 5 are shown here.
Dr. Sabri Abdelwahab
M.D.
Durham, NC
Dr. Trina Allen
M.D.
Durham, NC
Dr. Lionel Banez
MD
Durham, NC
Dr. Youwei Chen
M.D.
Durham, NC
Dr. Magdi Elgasim
M.D
Durham, NC
Compare Research Study Specialist nationally: see state-by-state distribution →
Frequently Asked Questions
What is Stephen Kimani, MD's specialty? ▼
Stephen Kimani, MD specializes in Research Study Specialist and practices in Chapel Hill, North Carolina. Credentials: MD.
How much does Stephen Kimani, MD prescribe under Medicare Part D? ▼
In 2024, Stephen Kimani, MD wrote 457 Medicare Part D claims totaling $511K in drug costs for 84 beneficiaries.
What is Stephen Kimani, MD's Medicare quality score? ▼
Stephen Kimani, MD has a CMS MIPS Final Score of 92.1/100 (Quality: 85.6). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Stephen Kimani, MD located? ▼
Stephen Kimani, MD is located at 170 MANNING DR, Chapel Hill, NC, 27514. Phone: (919) 966-1996.
What is Stephen Kimani, MD's NPI number? ▼
Stephen Kimani, MD's National Provider Identifier (NPI) is 1134528185, issued on 08/15/2014.
Does Stephen Kimani, MD prescribe more brand-name or generic drugs? ▼
Stephen Kimani, MD's prescribing is 13% brand-name and 87% generic drugs by claim count, with $504K in brand drug costs.
How many Research Study Specialist providers are there in the US? ▼
There are 508 Research Study Specialist providers across 42 states in the US. The average Research Study Specialist provider writes 922 Medicare Part D claims per year.
What drugs does Stephen Kimani, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Stephen Kimani, MD's most frequently prescribed drugs include Letrozole, Tamoxifen Citrate, Anastrozole. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Stephen Kimani, MD accept Medicare? ▼
Stephen Kimani, MD appears in CMS Medicare data with 457 Part D claims and 84 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Stephen Kimani, MD's credentials? ▼
Stephen Kimani, MD's NPI is 1134528185 with credentials MD. 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
View source datasets and methodology notes
- 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 (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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 August 2026 (NPPES) / 2024 (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
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.