Dr. Robert B. Knowles, MD
- Medicare services, 2021
- 1,367
- Part D claims, 2024
- 2,626
- Hospital affiliations
- 1
- Industry payments
- $61
- State license
- 1
- Practice address
- 1 Medical Center Boulevard, Cookeville, TN 38501
- Practice phone
- Call (931) 783-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Robert B. Knowles is an internist in Cookeville, Tennessee
Dr. Knowles practices at Cookeville Regional Medical Center in Cookeville, Tennessee, part of The City of Cookeville.
Dr. Knowles' NPI, 1548251341, was assigned on October 31, 2005. Dr. Knowles graduated from University of Alabama School of Medicine in 1995. Dr. Knowles holds Tennessee license MD28675.
- NPI
- 1548251341NPI Registry (opens in a new tab)
- NPI enumeration date
- October 31, 2005
- NPI status
- Active
- Practice phone
- (931) 783-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 57
- Medical school graduation
- 1995
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Robert B. Knowles practices at Cookeville Regional Medical Center in Cookeville, Tennessee
Dr. Knowles' primary practice is Cookeville Regional Medical Center, at 1 Medical Center Boulevard, Cookeville, TN 38501 in Putnam County. The practice phone is (931) 783-2000.
- Cookeville Regional Medical Center1 Medical Center Boulevard, Cookeville, TN 38501 · Putnam CountyPhone(931) 783-2000
Source: Dmand AI Affiliation Data
Dr. Robert B. Knowles is affiliated with 1 site of care
Dr. Knowles' primary practice is Cookeville Regional Medical Center in Cookeville, Tennessee, part of The City of Cookeville.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Robert B. Knowles' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Knowles practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Cookeville Regional Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dmand AI maps EHR vendors, IT decision makers and buying committees across The City of Cookeville and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Robert B. Knowles is one of 2,427 internists in Tennessee
Internal medicine is Dr. Knowles' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Knowles is licensed in Tennessee.
Specialties and state licenses
- Internal medicine, TennesseePrimary
Internists near Dr. Knowles
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Robert B. Knowles billed Medicare for 1,367 services in 2021
CMS data shows 1,367 Medicare services from Dr. Knowles across 14 procedure codes in 2021. Medicare paid $64,510 for them. Every service was in an office.
Dr. Knowles' Medicare services by type, 2020 to 2021
- 2020
- 2021
- Office and hospital visits
- 2020: 1,0942021: 90118%
- Other services
- 2020: 2382021: 16332%
- Tests and treatments
- 2020: 2462021: 15537%
- Lab and pathology
- 2020: 2772021: 14847%
- Drugs given in the office
- 2020: 2102021: 0100%
Dr. Knowles compared with the Tennessee median for internists, 2021
- Dr. Knowles
- Tennessee median
- Medicare services
- 1,367vs 6712.0 times
- Part D claims
- 2,104vs 3346.3 times
Medians across 2,462 internists in Tennessee with Dmand AI profiles that report each measure.
Dr. Knowles' most billed Medicare procedure codes, 2021
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Knowles?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Knowles and other internists in Tennessee.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Robert B. Knowles' patients have a median age of 67
Across all payers, Dmand AI patient panel data puts Dr. Knowles' median patient age at 67, with 52% women.
Dr. Knowles' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 67
Patient panel by sex, all payers
- Women52%
- Men47%
Source: Dmand AI Patient Panel Data
Dr. Robert B. Knowles wrote 2,626 Medicare Part D claims in 2024
In 2024, Dr. Knowles wrote 2,626 Medicare Part D claims for 179 patients. 89% of them were for generic drugs. CMS names the drug for 2,104 of them, across 72 drugs with 11 or more claims each, at $126,510 in total drug cost. In 2023, CMS named 1,966 claims across 66 drugs.
Dr. Knowles' Part D claims by kind of drug, 2024
- Generic2,342 claims89%
- Brand-name273 claims10%
- Other11 claims0%
Dr. Knowles' most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Knowles' Part D claims, 2024
- Opioids4%93 of 2,626 claims
- Antibiotics5%124 of 2,626 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,9662024: 2,1047%
Drugs named by CMS: 72 in 2024, 66 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. Robert B. Knowles received $61 in industry payments from 2018 to 2025
CMS Open Payments shows 4 general payments to Dr. Knowles from 3 drug and device companies from 2018 to 2025. Food and beverage make up the largest share, 77% of the total. Milliken Healthcare Products, LLC paid the most, $31.
General payments to Dr. Knowles by program year, 2018 to 2025
General payments to Dr. Knowles by kind, 2018 to 2025
- Food and beverage$4777%
- Education$1423%
Companies that paid Dr. Knowles the most, 2018 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Robert B. Knowles graduated from University of Alabama School of Medicine
Dr. Knowles graduated from University of Alabama School of Medicine in 1995.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Robert B. Knowles's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Robert B. Knowles
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What is Dr. Robert B. Knowles' NPI number?
Dr. Robert B. Knowles' NPI number is 1548251341. It was assigned on October 31, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Robert B. Knowles?
Dr. Robert B. Knowles is an internist in Cookeville, Tennessee. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Robert B. Knowles practice?
Dr. Knowles practices at 1 Medical Center Boulevard, Cookeville, TN 38501. Dr. Knowles' primary practice is Cookeville Regional Medical Center in Cookeville, Tennessee, part of The City of Cookeville.
What is Dr. Robert B. Knowles' office phone number?
The practice phone on file for Dr. Knowles is (931) 783-2000.
What is Dr. Robert B. Knowles' medical license number?
Dr. Knowles holds Tennessee license MD28675.
Which hospitals is Dr. Robert B. Knowles affiliated with?
Dr. Knowles practices at Cookeville Regional Medical Center in Cookeville, Tennessee.
Does Dr. Robert B. Knowles accept Medicare?
Yes. CMS data shows Dr. Knowles billed Medicare for 1,367 services in 2021.
What services does Dr. Robert B. Knowles bill to Medicare?
In 2021, Dr. Knowles' most billed Medicare services were office visit, established patient (99214), office visit, established patient (99213) and lab and pathology test (85610).
Where did Dr. Robert B. Knowles go to medical school?
Dr. Knowles graduated from University of Alabama School of Medicine in 1995.
What drugs does Dr. Robert B. Knowles prescribe most?
In 2024 Medicare Part D data, Dr. Knowles' most prescribed drugs by claims were Lisinopril, Amlodipine Besylate and Omeprazole.
Has Dr. Robert B. Knowles received payments from drug or device companies?
CMS Open Payments shows $61 in general payments to Dr. Knowles from 3 companies from 2018 to 2025. The largest total came from Milliken Healthcare Products, LLC.
How long has Dr. Robert B. Knowles been practicing?
Dr. Knowles graduated from medical school in 1995, 31 years ago.
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