NPI registry status
Active
2026 NPPES data Gastroenterology Physician NPI 1457349425 M.D.
Verify on CMS → Robert Knox, M.D.
Gastroenterology Physician in Murfreesboro, Tennessee.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 17,061 in Gastroenterology 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
1K
Medicare Part D claims · 303 beneficiaries · Gastroenterology Physician avg: 848
Generic prescribing
83%
generic claims · 17% 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
$3.1K
155 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Robert Knox, M.D. reported a CMS MIPS final score of 92.1/100 - above the 83.5 national average - and filed 1,293 Medicare Part D claims in 2024.
- 92.1/100
- MIPS score · +9 vs avg
- 1K
- Part D claims, 2024
- 83%
- 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.
Federal trust snapshot
What official records show about Robert Knox, M.D.
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 1457349425), first enumerated 10/12/2005.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 1,293 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
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- 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
$3.1K in reported industry payments (155 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 1457349425 · Gastroenterology Physician
NPI-10 · ENUM-LEGACY · TAX-MID · MIPS-ABOVE · RX-MID · BOOK-THIN · PHOTO-FINISH
- NPI-10 1457349425
- ENUM-LEGACY 2005
- TAX-MID 17K Gastroenterology Physician
- MIPS-ABOVE 92.1/100
- RX-MID 1,293
- BOOK-THIN 330 in Tennessee
- PHOTO-FINISH Maria Aguilar · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Knox · this prov…
Knox · this provider
92.1 MIPS pts
- Richard Craig · …
Richard Craig
92.1 MIPS pts
- Brian Smith · near
Brian Smith
92.1 MIPS pts
- Maria Aguilar · …
Maria Aguilar
92.1 MIPS pts
- Kathleen Boynton…
Kathleen Boynton
92.1 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Robert Knox, M.D.'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
Where Robert Knox, M.D. sits
This provider among gastroenterology physician peers
Across the 5,560 gastroenterology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Robert Knox, M.D. writes more Part D claims than 75% of them and scores higher on MIPS quality than 69% - placing this provider in the high-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one gastroenterology physician peer from a representative sample of 60; the gold marker is Robert Knox, 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 Knox, 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 Knox, M.D.?
High performer (top quartile)Primary specialty
Gastroenterology Physician
Medicare Part D claims
1,293 52% vs specialty avg
MIPS final score
92.1/100 8.6 pts vs avg
Specialty distribution in Tennessee
How Gastroenterology Physician compares to other specialties among Tennessee providers
Medicare quality performance, MIPS
Robert Knox, M.D.'s 2023 MIPS final score plotted against the Gastroenterology Physician 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 | 1457349425 |
|---|---|
| Specialty | Gastroenterology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 10/12/2005 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
92.0636
Final Score
Measured-score avg: 83.5
84.1272
Quality
100
Promoting Interoperability
Reporting: Alternative Payment Model
Hospital and facility affiliations
Facilities where Robert Knox, 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.
Murfreesboro Medical Clinic, P.A.
Murfreesboro, TN
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 Knox, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$3.1K
Largest payer
ABBVIE 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.
Brand vs generic prescribing mix · Typical
Robert Knox, M.D. - brand share 17.0%
Gastroenterology Physician average
17% brand-name claims vs 83% generic, on 1,293 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.
1,293
Total Claims
$889K
Total Drug Cost
303
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 2,330.6
- Total Day Supply
- 67,105
- Brand vs Generic
- 17% brand / 83% generic
- Brand Drug Cost
- $837K
- Generic Drug Cost
- $52K
- Antibiotic Claims
- 32
Patient Demographics
- Average Patient Age
- 73.0 years
- Avg HCC Risk Score
- 1.29
- Gender Split
- 64% female / 36% male
- Age Distribution
- <65: 34, 65-74: 132, 75-84: 112, 85+: 25
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Robert Knox, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Omeprazole
Omeprazole
374 claims
- Pantoprazole Sodium 141
Pantoprazole Sodium
141 claims
- Famotidine 46
Famotidine
46 claims
- Linzess 37
Linzess
37 claims
- Diphenoxylate-Atro… 36
Diphenoxylate-Atropine
36 claims
- Esomeprazole Magne… 36
Esomeprazole Magnesium
36 claims
- Budesonide Dr 34
Budesonide Dr
34 claims
- Ondansetron Odt 32
Ondansetron Odt
32 claims
| Drug | Claims |
|---|---|
| Omeprazole | 374 |
| Pantoprazole Sodium | 141 |
| Famotidine | 46 |
| Linzess Linaclotide | 37 |
| Diphenoxylate-Atropine Diphenoxylate Hcl/Atropine | 36 |
| Esomeprazole Magnesium | 36 |
| Budesonide Dr Budesonide | 34 |
| Ondansetron Odt Ondansetron | 32 |
| Amitriptyline Hcl | 29 |
| Creon Lipase/Protease/Amylase | 29 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gastroenterology Physician Overview
How Robert Knox, M.D. fits within the Gastroenterology Physician landscape nationally.
17,061
Gastroenterology Physician Providers in US
54
States with Gastroenterology Physician
848
Avg Claims per Provider
Robert Knox, M.D.'s 1,293 claims are above the specialty average of 848.
Nationwide Gastroenterology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Knox, both outside Tennessee 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 (2005)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Gastroenterology Physician Providers in Tennessee
Other clinicians with the same primary specialty enrolled in Tennessee, drawn from the same CMS NPPES roster as Knox.
One of 330 Gastroenterology Physician providers enrolled in Tennessee, 5 are shown here.
Dr. Ahmad Abu-Heija
M.D.
Oak Ridge, TN
Dr. Linas Adams
MD
Morristown, TN
Dr. Uchenna Agbim
MD
Memphis, TN
Dr. Nazneen Ahmed
M.D.
Memphis, TN
Dr. Abdullah Al-Rashdan
M.D.
Memphis, TN
Compare Gastroenterology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Robert Knox, M.D.'s specialty? ▼
Robert Knox, M.D. specializes in Gastroenterology Physician and practices in Murfreesboro, Tennessee. Credentials: M.D..
How much does Robert Knox, M.D. prescribe under Medicare Part D? ▼
In 2024, Robert Knox, M.D. wrote 1,293 Medicare Part D claims totaling $889K in drug costs for 303 beneficiaries.
What is Robert Knox, M.D.'s Medicare quality score? ▼
Robert Knox, M.D. has a CMS MIPS Final Score of 92.1/100 (Quality: 84.1). 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 Robert Knox, M.D. located? ▼
Robert Knox, M.D. is located at 1272 GARRISON DR, Murfreesboro, TN, 37129. Phone: (615) 867-8070.
What is Robert Knox, M.D.'s NPI number? ▼
Robert Knox, M.D.'s National Provider Identifier (NPI) is 1457349425, issued on 10/12/2005.
Does Robert Knox, M.D. prescribe more brand-name or generic drugs? ▼
Robert Knox, M.D.'s prescribing is 17% brand-name and 83% generic drugs by claim count, with $837K in brand drug costs.
How many Gastroenterology Physician providers are there in the US? ▼
There are 17,061 Gastroenterology Physician providers across 54 states in the US. The average Gastroenterology Physician provider writes 848 Medicare Part D claims per year.
What drugs does Robert Knox, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Robert Knox, M.D.'s most frequently prescribed drugs include Omeprazole, Pantoprazole Sodium, Famotidine. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Robert Knox, M.D. accept Medicare? ▼
Robert Knox, M.D. appears in CMS Medicare data with 1,293 Part D claims and 303 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Robert Knox, M.D.'s credentials? ▼
Robert Knox, M.D.'s NPI is 1457349425 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 (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.