Dr. Gregory Ross Johnston, DO
- Medicare services, 2024
- 88
- Medicare patients, 2024
- 65
- Part D claims, 2024
- 389
- Hospital affiliations
- 3
- Industry payments
- $1,325
- Practice address
- 2213 Cherry Street, Toledo, OH 43608
- Practice phone
- Call (419) 251-3232
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Johnston'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. Gregory Ross Johnston is a general surgeon in Toledo, Ohio
Dr. Johnston practices at Mercy Health - St. Vincent Medical Center in Toledo, Ohio, part of Bon Secours Mercy Health.
Dr. Johnston's NPI, 1982866109, was assigned on June 29, 2008. Dr. Johnston graduated from Michigan State University College of Osteopathic Medicine in 2008. Dr. Johnston holds Ohio license 34.011316.
- NPI
- 1982866109NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6800038530
- NPI enumeration date
- June 29, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (419) 251-3232
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 44
- Medical school graduation
- 2008
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory Ross Johnston practices at Mercy Health - St. Vincent Medical Center in Toledo, Ohio
Dr. Johnston's primary practice is Mercy Health - St. Vincent Medical Center, at 2213 Cherry Street, Toledo, OH 43608 in Lucas County. The practice phone is (419) 251-3232.
- Mercy Health - St. Vincent Medical Center2213 Cherry Street, Toledo, OH 43608 · Lucas CountyPhone(419) 251-3232
Source: Dmand AI Affiliation Data
Dr. Gregory Ross Johnston is affiliated with 5 sites of care and 4 medical groups
Dr. Johnston's primary practice is Mercy Health - St. Vincent Medical Center in Toledo, Ohio, part of Bon Secours Mercy Health. Dr. Johnston is also affiliated with Mercy Health - Tiffin Hospital. The medical group on file is Mercy Health Physicians. Dmand AI also links Dr. Johnston to 1 more hospital, 3 medical groups and 2 group practices and clinics, 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. Gregory Ross Johnston's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Johnston practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mercy Health - St. Vincent Medical Center | Available with a free account |
| +4 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Bon Secours Mercy Health and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Gregory Ross Johnston is one of 1,056 general surgeons in Ohio
Surgery is Dr. Johnston's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dmand AI has Dr. Johnston's licenses on file in 2 states: Ohio and Michigan.
Specialties and state licenses
- Surgery, OhioPrimary
- Michigan license
General surgeons near Dr. Johnston
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. Gregory Ross Johnston billed Medicare for 88 services in 2024
CMS data shows 88 Medicare services from Dr. Johnston across 4 procedure codes in 2024, for 65 Medicare patients. Medicare paid $7,725 for them.
Dr. Johnston's Medicare services by type, 2024
- Office and hospital visits73
- Surgery15
Where Dr. Johnston's Medicare services took place, 2024
- In an office7383%
- In a facility1517%
Dr. Johnston compared with the Ohio median for general surgeons, 2024
- Dr. Johnston
- Ohio median
- Medicare services
- 88vs 16848% below
- Medicare patients
- 65vs 12749% below
- Part D claims
- 299vs 466.5 times
Medians across 1,031 general surgeons in Ohio with Dmand AI profiles that report each measure.
Dr. Johnston'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. Johnston?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Johnston and other general surgeons in Ohio.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory Ross Johnston treated 65 Medicare patients in 2024, average age 69
CMS counts 65 Medicare patients who saw Dr. Johnston in 2024. The largest group is 65 to 74, with 32 patients. 75% of them have high blood pressure, and 66% have high cholesterol. Their average risk score is 1.34, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Johnston's median patient age at 51, with 77% women.
Dr. Johnston's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Johnston's Medicare patients by sex, 2024
- Women4366%
- Men2234%
Chronic conditions among Dr. Johnston's Medicare patients, 2024
- High blood pressure75%
- High cholesterol66%
- Arthritis57%
- Mood disorders43%
- Anxiety40%
- Depression38%
- Diabetes35%
- Chronic kidney disease32%
Share of Medicare patients with each condition. A patient can have several.
Dr. Johnston's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 51
Patient panel by sex, all payers
- Women77%
- Men22%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregory Ross Johnston wrote 389 Medicare Part D claims in 2024
In 2024, Dr. Johnston wrote 389 Medicare Part D claims for 111 patients. 92% of them were for generic drugs. CMS names the drug for 299 of them, across 10 drugs with 11 or more claims each, at $6,926 in total drug cost.
Dr. Johnston's Part D claims by kind of drug, 2024
- Generic359 claims92%
- Brand-name17 claims4%
- Other13 claims3%
Dr. Johnston'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. Johnston's Part D claims, 2024
- Opioids9%36 of 389 claims
- Antibiotics4%16 of 389 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
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. Gregory Ross Johnston ranks in the 62nd percentile for upper gastrointestinal (gi) endoscopy for acid reflux in Medicare
Dr. Johnston accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 45 procedures of upper gastrointestinal (gi) endoscopy for acid reflux by Dr. Johnston, more than 62% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Johnston ranks in Medicare procedure volume
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 62nd percentile45 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Hernia repair (minimally invasive): 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. Gregory Ross Johnston received $1,325 in industry payments from 2024 to 2025
CMS Open Payments shows 12 general payments to Dr. Johnston from 6 drug and device companies from 2024 to 2025. Food and beverage make up the largest share, 58% of the total. Intuitive Surgical, Inc. paid the most, $701.
General payments to Dr. Johnston by program year, 2024 to 2025
General payments to Dr. Johnston by kind, 2024 to 2025
- Food and beverage$77258%
- Travel and lodging$55342%
Companies that paid Dr. Johnston the most, 2024 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gregory Ross Johnston graduated from Michigan State University College of Osteopathic Medicine
Dr. Johnston graduated from Michigan State University College of Osteopathic Medicine in 2008.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gregory Ross Johnston'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) |
| 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. Gregory Ross Johnston
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. Gregory Ross Johnston's NPI number?
Dr. Gregory Ross Johnston's NPI number is 1982866109. It was assigned on June 29, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory Ross Johnston?
Dr. Gregory Ross Johnston is a general surgeon in Toledo, Ohio. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Gregory Ross Johnston practice?
Dr. Johnston practices at 2213 Cherry Street, Toledo, OH 43608. Dr. Johnston's primary practice is Mercy Health - St. Vincent Medical Center in Toledo, Ohio, part of Bon Secours Mercy Health. Dmand AI also links Dr. Johnston to 1 hospital, 3 medical groups and 2 group practices and clinics.
What is Dr. Gregory Ross Johnston's office phone number?
The practice phone on file for Dr. Johnston is (419) 251-3232.
What is Dr. Gregory Ross Johnston's medical license number?
Dr. Johnston holds Ohio license 34.011316, one of the licenses on file in 2 states.
Which states has Dr. Gregory Ross Johnston been licensed in?
Dmand AI has state licenses on file for Dr. Johnston in Ohio and Michigan.
Which hospitals is Dr. Gregory Ross Johnston affiliated with?
Dr. Johnston practices at Mercy Health - St. Vincent Medical Center in Toledo, Ohio. Dr. Johnston is also affiliated with Mercy Health - Tiffin Hospital. Dmand AI links Dr. Johnston to 1 more hospital.
What medical group is Dr. Gregory Ross Johnston part of?
Dr. Johnston is linked to Mercy Health Physicians. Dmand AI links Dr. Johnston to 3 more medical groups.
Does Dr. Gregory Ross Johnston accept Medicare?
Yes. CMS data shows Dr. Johnston billed Medicare for 88 services in 2024, and Dr. Johnston accepts Medicare assignment.
How many Medicare patients does Dr. Gregory Ross Johnston see?
CMS counts 65 Medicare patients who saw Dr. Johnston in 2024, with an average age of 69.
Show 5 more questionsShow fewer questions
What services does Dr. Gregory Ross Johnston bill to Medicare?
In 2024, Dr. Johnston's most billed Medicare services were office visit, established patient (99213), office visit, established patient (99214) and office visit, new patient (99204).
Where did Dr. Gregory Ross Johnston go to medical school?
Dr. Johnston graduated from Michigan State University College of Osteopathic Medicine in 2008.
What drugs does Dr. Gregory Ross Johnston prescribe most?
In 2024 Medicare Part D data, Dr. Johnston's most prescribed drugs by claims were Pantoprazole Sodium, Sucralfate and Oxycodone-Acetaminophen.
Has Dr. Gregory Ross Johnston received payments from drug or device companies?
CMS Open Payments shows $1,325 in general payments to Dr. Johnston from 6 companies from 2024 to 2025. The largest total came from Intuitive Surgical, Inc.
How long has Dr. Gregory Ross Johnston been practicing?
Dr. Johnston graduated from medical school in 2008, 18 years ago.
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