NPI registry status
Active
2026 NPPES data Nephrology Physician NPI 1518944198 M.D.
Verify on CMS → Robert Clark, M.D.
Nephrology Physician in Meridian, Mississippi.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 10,534 in Nephrology Physician, 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
2K
Medicare Part D claims · 274 beneficiaries · Nephrology Physician avg: 1K
MIPS score
93.1/100
▲ 10 pts above national avg 83.1 · Exceptional
Industry payments
$255.57
12 payments · CMS Open Payments (Sunshine Act)
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Robert Clark, M.D. reported a CMS MIPS final score of 93.1/100 - above the 83.1 national average - and filed 1,869 Medicare Part D claims in 2023.
- 93.1/100
- MIPS score · +10 vs avg
- 2K
- Part D claims, 2023
- 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.
Robert Clark, M.D.'s MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
93 Top 29% higher than 71% of 477,587 scored providers
Each bar is a band; taller bars hold more scored 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.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Robert Clark, M.D. sits
This provider among nephrology physician peers
Across the 2,476 nephrology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Robert Clark, M.D. writes more Part D claims than 72% of them and scores higher on MIPS quality than 76% - placing this provider in the high-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one nephrology physician peer from a representative sample of 60; the gold marker is Robert Clark, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Robert Clark, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 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 Robert Clark, M.D.?
High performer (top quartile)Primary specialty
Nephrology Physician
Medicare Part D claims
1,869 29% vs specialty avg
MIPS final score
93.1/100 10 pts vs avg
Specialty distribution in Mississippi
How Nephrology Physician compares to other specialties among Mississippi providers
Medicare quality performance, MIPS
Robert Clark, M.D.'s 2023 MIPS final score plotted against the Nephrology Physician national average
- MIPS Final Score
- 93.1/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Nephrology Physician) - 93.1/100 vs national avg 83.1
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).
Robert Clark, M.D. appears in the CMS NPPES registry as a Nephrology Physician provider holding M.D. credentials at 1600 22ND AVE, Meridian, MS, 39301, with a listed phone of (601) 483-5322. NPI 1518944198 was issued on 12/27/2005.
Medicare Part D records for calendar year 2023 show 1,869 prescription claims written by this provider, covering 274 Medicare beneficiaries and totaling roughly $625K in drug spend, with an opioid prescribing rate of 2.3%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 93.1/100 for the 2023 performance year (Quality 83.1), compared with the national average of 83.1.
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
Provider Details
| NPI | 1518944198 |
|---|---|
| Specialty | Nephrology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 12/27/2005 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
93.1001
Final Score
Avg: 83.1
83.0821
Quality
88
Promoting Interoperability
Reporting: Alternative Payment Model
Hospital and facility affiliations
Facilities where Robert Clark, 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.
Anderson Physician Alliance Inc
Meridian, MS
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 Robert Clark, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$256
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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
1,869
Total Claims
$625K
Total Drug Cost
274
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 3,076
- Total Day Supply
- 89,161
- Generic Drug Cost
- $107K
- Opioid Claims
- 43 (2.3% rate)
- Antibiotic Claims
- 21
Patient Demographics
- Average Patient Age
- 65.3 years
- Avg HCC Risk Score
- 5.74
- Gender Split
- 45% female / 55% male
- Age Distribution
- <65: 116, 65-74: 88, 75-84: 53, 85+: 17
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Robert Clark, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Sevelamer Carbonate
Sevelamer Carbonate
168 claims
- Amlodipine Besylate
Amlodipine Besylate
101 claims
- Velphoro
Velphoro
79 claims
- Auryxia 61
Auryxia
61 claims
- Furosemide 56
Furosemide
56 claims
- Carvedilol 54
Carvedilol
54 claims
- Levothyroxine Sodium 53
Levothyroxine Sodium
53 claims
- Pantoprazole Sodium 47
Pantoprazole Sodium
47 claims
| Drug | Claims |
|---|---|
| Sevelamer Carbonate | 168 |
| Amlodipine Besylate | 101 |
| Velphoro Sucroferric Oxyhydroxide | 79 |
| Auryxia Ferric Citrate | 61 |
| Furosemide | 56 |
| Carvedilol | 54 |
| Levothyroxine Sodium | 53 |
| Pantoprazole Sodium | 47 |
| Calcium Acetate | 44 |
| Clonidine Hcl | 44 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Nephrology Physician Overview
How Robert Clark, M.D. 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
Robert Clark, M.D.'s 1,869 claims are above the specialty average of 1,454.
Nearby Nephrology Physician Providers in Mississippi
Other clinicians with the same primary specialty enrolled in Mississippi, drawn from the same CMS NPPES roster as Clark.
Dr. Mohit Ahuja
M.D.
Flowood, MS
Dr. John Andy
M.D.
Meridian, MS
Dr. Mohammad Atari
MD
Jackson, MS
Dr. Uma Mahesh Avula
MD
Jackson, MS
Dr. Calvin Baker
MD
Tupelo, MS
Compare Nephrology Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Mississippi medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Nephrology Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Robert Clark, M.D.'s specialty? ▼
Robert Clark, M.D. specializes in Nephrology Physician and practices in Meridian, Mississippi. Credentials: M.D..
How much does Robert Clark, M.D. prescribe under Medicare Part D? ▼
In 2023, Robert Clark, M.D. wrote 1,869 Medicare Part D claims totaling $625K in drug costs for 274 beneficiaries.
What is Robert Clark, M.D.'s Medicare quality score? ▼
Robert Clark, M.D. has a CMS MIPS Final Score of 93.1/100 (Quality: 83.1). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Robert Clark, M.D. located? ▼
Robert Clark, M.D. is located at 1600 22ND AVE, Meridian, MS, 39301. Phone: (601) 483-5322.
What is Robert Clark, M.D.'s NPI number? ▼
Robert Clark, M.D.'s National Provider Identifier (NPI) is 1518944198, issued on 12/27/2005.
Does Robert Clark, M.D. prescribe opioids? ▼
Yes, Robert Clark, M.D. had 43 opioid claims in 2023 with an opioid prescribing rate of 2.3%.
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 Robert Clark, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Robert Clark, M.D.'s most frequently prescribed drugs include Sevelamer Carbonate, Amlodipine Besylate, Velphoro. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Robert Clark, M.D. accept Medicare? ▼
Robert Clark, M.D. appears in CMS Medicare data with 1,869 Part D claims and 274 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Robert Clark, M.D.'s credentials? ▼
Robert Clark, M.D.'s NPI is 1518944198 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
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 (2023). 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 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
Compiled from official public sources by the PlainDoctor editorial team.