Disease ProgressionDopamine AgentsParkinson Disease
Dr. Gary J. Leo, DO
NPI1336182237
- Medicare services, 2021
- 113
- Part D claims, 2022
- 66
- Publications
- 2
- Clinical trials
- 1
- Industry payments
- $130
- Practice address
- 2311 N Prospect Ave, Milwaukee, WI 53211-4445
- Practice phone
- Call (414) 319-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Columbia St. Mary's Hospital Milwaukee, INC
Multi-specialty group site · Milwaukee, Wisconsin
Find Dr. Leo'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. Gary J. Leo is a neurologist in Newport News, Virginia
Dr. Leo practices at Columbia St. Mary's Hospital Milwaukee, INC in Milwaukee, Wisconsin.
Dr. Leo's NPI, 1336182237, was assigned on June 14, 2006. Dr. Leo graduated from Des Moines University of Osteopathic Medicine and Health Sciences in 1979. Dr. Leo holds Wisconsin license 23807.
NPI and contact details
- NPI
- 1336182237NPI Registry (opens in a new tab)
- NPI enumeration date
- June 14, 2006
- NPI status
- Active
- Practice phone
- (414) 319-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 73
- Medical school graduation
- 1979
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gary J. Leo practices in Milwaukee and Newport News
Dr. Leo's primary practice is Columbia St. Mary's Hospital Milwaukee, INC, at 2311 N Prospect Ave, Milwaukee, WI 53211-4445. The practice phone is (414) 319-3000. The NPI Registry lists Dr. Leo's practice address as 500 J Clyde Morris Blvd, Newport News, VA 23601.
- Columbia St. Mary's Hospital Milwaukee, INCPrimary2311 N Prospect Ave, Milwaukee, WI 53211-4445Phone(414) 319-3000
- NPI Registry address500 J Clyde Morris Blvd, Newport News, VA 23601 · Newport News CityPhone(414) 319-3000
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. Gary J. Leo is affiliated with 3 sites of care and 3 medical groups
Dr. Leo's primary practice is Columbia St. Mary's Hospital Milwaukee, INC in Milwaukee, Wisconsin. The medical group on file is Ascension Medical Group. Dmand AI also links Dr. Leo to 2 more group practices and clinics and 2 medical groups, each named with a free account.
Columbia St. Mary's Hospital Milwaukee, INCPrimary
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Gary J. Leo's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Leo practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Columbia St. Mary's Hospital Milwaukee, INC | Available with a free account |
| +2 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gary J. Leo is one of 516 neurologists in Virginia
Neurology is Dr. Leo's primary specialty in the NPI Registry, under taxonomy code 2084N0400X. Dr. Leo is licensed in Wisconsin.
Specialties and state licenses
- Neurology, WisconsinPrimary
Neurologists near Dr. Leo
Counts of neurologists 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. Gary J. Leo billed Medicare for 113 services in 2021
CMS data shows 113 Medicare services from Dr. Leo across 2 procedure codes in 2021, all of them office visits. Medicare paid $6,594 for them.
Medicare services, 2021113
Paid by Medicare$6,594
Procedure codes2
Dr. Leo's Medicare services by type, 2020 to 2021
- 2020
- 2021
- Office and hospital visits
- 2020: 1372021: 11318%
Where Dr. Leo's Medicare services took place, 2021
- In an office5851%
- In a facility5549%
Dr. Leo compared with the Virginia median for neurologists, 2021
- Dr. Leo
- Virginia median
- Medicare services
- 113vs 42974% below
- Part D claims
- 66vs 39083% below
Medians across 489 neurologists in Virginia with Dmand AI profiles that report each measure.
Dr. Leo's 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.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gary J. Leo's patients have a median age of 65
Across all payers, Dmand AI patient panel data puts Dr. Leo's median patient age at 65, with 55% women.
Dr. Leo's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women55%
- Men45%
Source: Dmand AI Patient Panel Data
Dr. Gary J. Leo wrote 66 Medicare Part D claims in 2022
In 2022, Dr. Leo wrote 66 Medicare Part D claims. They cover 5 drugs, with $5,601 in total drug cost. In 2021, CMS named 1,002 claims across 29 drugs.
Part D claims, 202266
Drugs named by CMS5
Total drug cost$5,601
Dr. Leo's most prescribed drugs by claims, 2022
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2021 to 2022
- 2021
- 2022
- Claims for drugs CMS names
- 2021: 1,0022022: 6693%
Drugs named by CMS: 5 in 2022, 29 in 2021.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Gary J. Leo has 2 publications on record
Dmand AI links 2 papers to Dr. Leo. The most frequent topics are Parkinson Disease. Dr. Leo has published most often in South Med J. Dr. Leo's most frequent co-author is David Geldmacher.
Papers2
Topics Dr. Leo writes about most
- Parkinson Disease
Dr. Leo's most frequent co-authors
Recent publications by Dr. Leo
Advance Care PlanningFamilyLiving Wills
See who Dr. Leo researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Leo works with, so you can find a warm path to the right neurologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Gary J. Leo has worked on 1 clinical trial
Dmand AI links Dr. Leo to 1 clinical trial. Open Payments lists research payments to Dr. Leo that name 1 trial.
Investigators on the most trials with Dr. Leo
- Punit Agrawal, DO1 shared trial
- Sarah D. Atkinson, MD1 shared trial
- Ronald Aung-Din, MD1 shared trial
Recent clinical trials with Dr. Leo
$4,256 in research paymentsPimavanserin tartrate (ACP-103)
Sources: Open Payments (CMS), 2025 data, released July 7, 2026; Dmand AI Research Linkage; and ClinicalTrials.gov (National Library of Medicine)
Dr. Gary J. Leo received $130 in industry payments from 2018 to 2019
CMS Open Payments shows 2 general payments to Dr. Leo from 2 drug and device companies from 2018 to 2019. Food and beverage make up the largest share, 100% of the total. Acorda Therapeutics, Inc paid the most, $110. It also lists 1 research payment totaling $4,256 in 2017, naming 1 clinical trial.
General payments to Dr. Leo by program year, 2018 to 2019
Companies that paid Dr. Leo the most, 2018 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gary J. Leo graduated from Des Moines University of Osteopathic Medicine and Health Sciences
Dr. Leo graduated from Des Moines University of Osteopathic Medicine and Health Sciences in 1979.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gary J. Leo'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Clinical trials and co-investigators | Dmand AI Research LinkageClinicalTrials.gov (National Library of Medicine) (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. Gary J. Leo
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. Gary J. Leo's NPI number?
Dr. Gary J. Leo's NPI number is 1336182237. It was assigned on June 14, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gary J. Leo?
Dr. Gary J. Leo is a neurologist in Newport News, Virginia. The primary specialty in the NPI Registry is Neurology Physician (taxonomy code 2084N0400X).
Where does Dr. Gary J. Leo practice?
Dr. Leo practices at 2311 N Prospect Ave, Milwaukee, WI 53211-4445. Dr. Leo also practices at 500 J Clyde Morris Blvd, Newport News, VA 23601. Dr. Leo's primary practice is Columbia St. Mary's Hospital Milwaukee, INC in Milwaukee, Wisconsin. Dmand AI also links Dr. Leo to 2 group practices and clinics and 2 medical groups.
What is Dr. Gary J. Leo's office phone number?
The practice phone on file for Dr. Leo is (414) 319-3000.
What is Dr. Gary J. Leo's medical license number?
Dr. Leo holds Wisconsin license 23807.
What medical group is Dr. Gary J. Leo part of?
Dr. Leo is linked to Ascension Medical Group. Dmand AI links Dr. Leo to 2 more medical groups.
Does Dr. Gary J. Leo accept Medicare?
Yes. CMS data shows Dr. Leo billed Medicare for 113 services in 2021.
What services does Dr. Gary J. Leo bill to Medicare?
In 2021, Dr. Leo's most billed Medicare services were office visit, established patient (99214) and office visit, established patient (99213).
Where did Dr. Gary J. Leo go to medical school?
Dr. Leo graduated from Des Moines University of Osteopathic Medicine and Health Sciences in 1979.
What drugs does Dr. Gary J. Leo prescribe most?
In 2022 Medicare Part D data, Dr. Leo's most prescribed drugs by claims were Carbidopa-Levodopa, Venlafaxine HCl ER and Amantadine.
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Has Dr. Gary J. Leo received payments from drug or device companies?
CMS Open Payments shows $130 in general payments to Dr. Leo from 2 companies from 2018 to 2019. The largest total came from Acorda Therapeutics, Inc.
How long has Dr. Gary J. Leo been practicing?
Dr. Leo graduated from medical school in 1979, 47 years ago.
Does Dr. Gary J. Leo do research?
Dmand AI links 2 publications to Dr. Leo. Dr. Leo has worked on 1 clinical trial.
Who does Dr. Gary J. Leo publish with?
Dr. Leo's most frequent co-authors are David Geldmacher (1 shared paper).
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