Dr. John D. Leff, MD
- Medicare services, 2024
- 413
- Medicare patients, 2024
- 216
- Part D claims, 2024
- 184
- Publications
- 1
- Hospital affiliations
- 1
- Practice address
- 4845 Knightsbridge Blvd Ste 110, Columbus, OH 43214
- Practice phone
- Call (614) 273-0400
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Knightsbridge Surgery Center
Surgery Center - Medicare-Certified · Columbus, Ohio
Find Dr. Leff's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. John D. Leff is a general surgeon in Columbus, Ohio
Dr. Leff practices at Knightsbridge Surgery Center in Columbus, Ohio.
Dr. Leff's NPI, 1396744140, was assigned on July 14, 2005. Dr. Leff graduated from Ohio State University College of Medicine in 1996. Dr. Leff holds Ohio license 35073410L.
- NPI
- 1396744140NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2668405770
- NPI enumeration date
- July 14, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (614) 273-0400
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 56
- Medical school graduation
- 1996
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John D. Leff practices at Knightsbridge Surgery Center in Columbus, Ohio
Dr. Leff's primary practice is Knightsbridge Surgery Center, at 4845 Knightsbridge Blvd Ste 110, Columbus, OH 43214. The practice phone is (614) 273-0400.
- Knightsbridge Surgery Center4845 Knightsbridge Blvd Ste 110, Columbus, OH 43214Phone(614) 273-0400
Source: Dmand AI Affiliation Data
Dr. John D. Leff is affiliated with 5 sites of care and 3 medical groups
Dr. Leff's primary practice is Knightsbridge Surgery Center in Columbus, Ohio. Dr. Leff is also affiliated with OhioHealth Riverside Methodist Hospital. The medical group on file is OhioHealth Physician Group. Dmand AI also links Dr. Leff to 3 more group practices and clinics and 2 medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John D. Leff's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Leff practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Knightsbridge Surgery Center | Available with a free account |
| +4 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John D. Leff is one of 1,056 general surgeons in Ohio
Surgery is Dr. Leff's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Leff is licensed in Ohio.
Specialties and state licenses
- Surgery, OhioPrimary
General surgeons near Dr. Leff
Counts of general surgeons 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. John D. Leff billed Medicare for 413 services in 2024
CMS data shows 413 Medicare services from Dr. Leff across 9 procedure codes in 2024, for 216 Medicare patients. Medicare paid $27,443 for them.
Dr. Leff's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4502024: 39412%
- Surgery
- 2023: 382024: 1950%
Where Dr. Leff's Medicare services took place, 2024
- In an office17643%
- In a facility23757%
Dr. Leff compared with the Ohio median for general surgeons, 2024
- Dr. Leff
- Ohio median
- Medicare services
- 413vs 1682.5 times
- Medicare patients
- 216vs 12770% above
- Part D claims
- 149vs 463.2 times
Medians across 1,031 general surgeons in Ohio with Dmand AI profiles that report each measure.
Dr. Leff's most billed Medicare procedure codes, 2024
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. Leff?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Leff and other general surgeons in Ohio.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John D. Leff treated 216 Medicare patients in 2024, average age 75
CMS counts 216 Medicare patients who saw Dr. Leff in 2024. The largest group is 65 to 74, with 97 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 7% are also on Medicaid. Their average risk score is 1.51, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Leff's median patient age at 61, with 44% women.
Dr. Leff's Medicare patients by age, 2024
Dr. Leff's Medicare patients by sex, 2024
- Women10147%
- Men11553%
Chronic conditions among Dr. Leff's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis55%
- Ischemic heart disease37%
- Chronic kidney disease31%
- Mood disorders31%
- Diabetes29%
- Depression28%
Share of Medicare patients with each condition. A patient can have several.
Dr. Leff's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 61
Patient panel by sex, all payers
- Women44%
- Men54%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John D. Leff wrote 184 Medicare Part D claims in 2024
In 2024, Dr. Leff wrote 184 Medicare Part D claims for 83 patients. 99% of them were for generic drugs. CMS names the drug for 149 of them, across 3 drugs with 11 or more claims each, at $230 in total drug cost. In 2023, CMS named 162 claims across 3 drugs.
Dr. Leff's Part D claims by kind of drug, 2024
- Generic183 claims99%
- Brand-name and other1 claims1%
Dr. Leff's 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. Leff's Part D claims, 2024
- Opioids37%68 of 184 claims
- Antibiotics8%15 of 184 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: 1622024: 1498%
Drugs named by CMS: 3 in 2024, 3 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
Dr. John D. Leff ranks in the 92nd percentile for hernia repair (minimally invasive) in Medicare
Dr. Leff accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 24 procedures of hernia repair (minimally invasive) by Dr. Leff, more than 92% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Leff ranks in Medicare procedure volume
- Hernia repair (minimally invasive)
- 92nd percentile24 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Colonoscopy: 1 to 10 procedures (CMS shows small counts as a range)
Hernia repair - groin (open): 1 to 10 procedures (CMS shows small counts as a range)
Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)
Upper gastrointestinal (GI) endoscopy for acid reflux: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. John D. Leff has 1 publication on record
Dmand AI links 1 paper to Dr. Leff in 2020. Dr. Leff's most frequent co-authors are Brian Thomas Dusseau, DO, Bridget Onders, MD and Andrei Radulescu, MD, PhD.
Dr. Leff's most frequent co-authors
- Brian Thomas Dusseau, DO1 shared paper
- Bridget Onders, MD1 shared paper
- Andrei Radulescu, MD, PhD1 shared paper
Recent publications by Dr. Leff
See who Dr. Leff researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Leff works with, so you can find a warm path to the right general surgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. John D. Leff received $4,477 in industry payments from 2016 to 2025
CMS Open Payments shows 183 general payments to Dr. Leff from 50 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 82% of the total. Integra LifeSciences Corporation paid the most, $825.
General payments to Dr. Leff by program year, 2016 to 2025
General payments to Dr. Leff by kind, 2016 to 2025
- Food and beverage$3,66382%
- Device or supply loans$77617%
- Education$200%
- Entertainment$90%
- Consulting fees$80%
Companies that paid Dr. Leff the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John D. Leff graduated from Ohio State University College of Medicine
Dr. Leff graduated from Ohio State University College of Medicine in 1996.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John D. Leff'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 DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. John D. Leff
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. John D. Leff's NPI number?
Dr. John D. Leff's NPI number is 1396744140. It was assigned on July 14, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. John D. Leff?
Dr. John D. Leff is a general surgeon in Columbus, Ohio. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. John D. Leff practice?
Dr. Leff practices at 4845 Knightsbridge Blvd Ste 110, Columbus, OH 43214. Dr. Leff's primary practice is Knightsbridge Surgery Center in Columbus, Ohio. Dmand AI also links Dr. Leff to 3 group practices and clinics and 2 medical groups.
What is Dr. John D. Leff's office phone number?
The practice phone on file for Dr. Leff is (614) 273-0400.
What is Dr. John D. Leff's medical license number?
Dr. Leff holds Ohio license 35073410L.
Which hospitals is Dr. John D. Leff affiliated with?
Dr. Leff is affiliated with OhioHealth Riverside Methodist Hospital.
What medical group is Dr. John D. Leff part of?
Dr. Leff is linked to OhioHealth Physician Group. Dmand AI links Dr. Leff to 2 more medical groups.
Does Dr. John D. Leff accept Medicare?
Yes. CMS data shows Dr. Leff billed Medicare for 413 services in 2024, and Dr. Leff accepts Medicare assignment.
How many Medicare patients does Dr. John D. Leff see?
CMS counts 216 Medicare patients who saw Dr. Leff in 2024, with an average age of 75.
What services does Dr. John D. Leff bill to Medicare?
In 2024, Dr. Leff's most billed Medicare services were hospital inpatient care (99231), hospital inpatient care (99232) and office visit, established patient (99212).
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Where did Dr. John D. Leff go to medical school?
Dr. Leff graduated from Ohio State University College of Medicine in 1996.
What drugs does Dr. John D. Leff prescribe most?
In 2024 Medicare Part D data, Dr. Leff's most prescribed drugs by claims were Gabapentin, Tramadol HCl and Ondansetron ODT.
Has Dr. John D. Leff received payments from drug or device companies?
CMS Open Payments shows $4,477 in general payments to Dr. Leff from 50 companies from 2016 to 2025. The largest total came from Integra LifeSciences Corporation.
How long has Dr. John D. Leff been practicing?
Dr. Leff graduated from medical school in 1996, 30 years ago.
Does Dr. John D. Leff do research?
Dmand AI links 1 publication to Dr. Leff.
Who does Dr. John D. Leff publish with?
Dr. Leff's most frequent co-authors are Brian Thomas Dusseau, DO (1 shared paper), Bridget Onders, MD (1 shared paper) and Andrei Radulescu, MD, PhD (1 shared paper).
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