Dr. Ryan MacKenzie Gardner, MD
- Medicare services, 2024
- 500
- Medicare patients, 2024
- 69
- Publications
- 8
- Hospital affiliations
- 3
- Industry payments
- $45
- Practice address
- 800 Washington Street, Boston, MA 02111
- Practice phone
- Call (617) 636-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Gardner'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. Ryan MacKenzie Gardner is an emergency medicine physician in Boston, Massachusetts
Dr. Gardner practices at Tufts Medical Center in Boston, Massachusetts, part of Tufts Medicine.
Dr. Gardner's NPI, 1588195333, was assigned on March 23, 2017. Dr. Gardner holds Massachusetts license 271295.
- NPI
- 1588195333NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4587080981
- NPI enumeration date
- March 23, 2017
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (617) 636-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 35
- Medical school graduation
- 2017
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Ryan MacKenzie Gardner practices at Tufts Medical Center in Boston, Massachusetts
Dr. Gardner's primary practice is Tufts Medical Center, at 800 Washington Street, Boston, MA 02111 in Suffolk County. The practice phone is (617) 636-5000.
- Tufts Medical Center800 Washington Street, Boston, MA 02111 · Suffolk CountyPhone(617) 636-5000
Source: Dmand AI Affiliation Data
Dr. Ryan MacKenzie Gardner is affiliated with 4 sites of care and 7 medical groups
Dr. Gardner's primary practice is Tufts Medical Center in Boston, Massachusetts, part of Tufts Medicine. Dr. Gardner is also affiliated with Beth Israel Deaconess Medical Center. The medical group on file is University Hospitals Medical Practices. Dmand AI also links Dr. Gardner to 1 more hospital, 6 medical groups and 1 imaging center, 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. Ryan MacKenzie Gardner's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gardner practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Tufts Medical Center | Available with a free account |
| +3 more sites and 6 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 Tufts Medicine and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Ryan MacKenzie Gardner is one of 1,483 emergency medicine physicians in Massachusetts
Emergency medicine is Dr. Gardner's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Gardner is licensed in Massachusetts.
Specialties and state licenses
- Emergency medicine, MassachusettsPrimary
Emergency medicine physicians near Dr. Gardner
Counts of emergency medicine physicians 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. Ryan MacKenzie Gardner billed Medicare for 500 services in 2024
CMS data shows 500 Medicare services from Dr. Gardner across 5 procedure codes in 2024, for 69 Medicare patients. Medicare paid $61,335 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Gardner's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 5152024: 39923%
- Surgery
- 2023: 152024: 62313%
- Imaging
- 2023: 02024: 39
- Tests and treatments
- 2023: 1702024: 0100%
Dr. Gardner compared with the Massachusetts median for emergency medicine physicians, 2024
- Dr. Gardner
- Massachusetts median
- Medicare services
- 500vs 34147% above
- Medicare patients
- 69vs 33780% below
Medians across 1,477 emergency medicine physicians in Massachusetts with Dmand AI profiles that report each measure.
Dr. Gardner'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. Gardner?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Gardner and other emergency medicine physicians in Massachusetts.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Ryan MacKenzie Gardner treated 69 Medicare patients in 2024, average age 72
CMS counts 69 Medicare patients who saw Dr. Gardner in 2024. The largest group is 65 to 74, with 28 patients. 75% of them have heart failure, and 75% have high blood pressure. 26% are also on Medicaid. Their average risk score is 2.07, 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. Gardner's median patient age at 63, with 32% women.
Dr. Gardner's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Gardner's Medicare patients by sex, 2024
- Women2841%
- Men4159%
Chronic conditions among Dr. Gardner's Medicare patients, 2024
- Heart failure75%
- High blood pressure75%
- High cholesterol75%
- Ischemic heart disease75%
- Chronic kidney disease68%
- Atrial fibrillation67%
- Anxiety49%
- COPD49%
Share of Medicare patients with each condition. A patient can have several.
Dr. Gardner's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 63
Patient panel by sex, all payers
- Women32%
- Men68%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
How Dr. Ryan MacKenzie Gardner takes part in Medicare
Dr. Gardner accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Ryan MacKenzie Gardner has 8 publications on record
Dmand AI links 8 papers to Dr. Gardner, published from 2019 to 2025. 2019 was the busiest year, with 2. The most frequent topics are Out-of-Hospital Cardiac Arrest and Cardiopulmonary Resuscitation. Dr. Gardner has published most often in Resuscitation. Dr. Gardner's most frequent co-authors are Michael William Donnino, MD, Katherine M. Berg, MD and Stephen Hallisey.
Dr. Gardner's papers by year, 2019 to 2025
Topics Dr. Gardner writes about most
- Out-of-Hospital Cardiac Arrest
- Cardiopulmonary Resuscitation
Dr. Gardner's most frequent co-authors
- Michael William Donnino, MD4 shared papers
- Katherine M. Berg, MD2 shared papers
- Stephen Hallisey2 shared papers
Recent publications by Dr. Gardner
Resuscitation
See who Dr. Gardner researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Gardner works with, so you can find a warm path to the right emergency medicine physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Ryan MacKenzie Gardner received $45 in industry payments from 2023 to 2025
CMS Open Payments shows 2 general payments to Dr. Gardner from 2 drug and device companies from 2023 to 2025. Food and beverage make up the largest share, 100% of the total. Alnylam Pharmaceuticals Inc. paid the most, $27.
General payments to Dr. Gardner by program year, 2023 to 2025
Companies that paid Dr. Gardner the most, 2023 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Ryan MacKenzie Gardner'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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (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) |
| 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. Ryan MacKenzie Gardner
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. Ryan MacKenzie Gardner's NPI number?
Dr. Ryan MacKenzie Gardner's NPI number is 1588195333. It was assigned on March 23, 2017, and it is active in the NPI Registry.
What kind of doctor is Dr. Ryan MacKenzie Gardner?
Dr. Ryan MacKenzie Gardner is an emergency medicine physician in Boston, Massachusetts. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Ryan MacKenzie Gardner practice?
Dr. Gardner practices at 800 Washington Street, Boston, MA 02111. Dr. Gardner's primary practice is Tufts Medical Center in Boston, Massachusetts, part of Tufts Medicine. Dmand AI also links Dr. Gardner to 1 hospital, 6 medical groups and 1 imaging center.
What is Dr. Ryan MacKenzie Gardner's office phone number?
The practice phone on file for Dr. Gardner is (617) 636-5000.
What is Dr. Ryan MacKenzie Gardner's medical license number?
Dr. Gardner holds Massachusetts license 271295.
Which hospitals is Dr. Ryan MacKenzie Gardner affiliated with?
Dr. Gardner practices at Tufts Medical Center in Boston, Massachusetts. Dr. Gardner is also affiliated with Beth Israel Deaconess Medical Center. Dmand AI links Dr. Gardner to 1 more hospital.
What medical group is Dr. Ryan MacKenzie Gardner part of?
Dr. Gardner is linked to University Hospitals Medical Practices. Dmand AI links Dr. Gardner to 6 more medical groups.
Does Dr. Ryan MacKenzie Gardner accept Medicare?
Yes. CMS data shows Dr. Gardner billed Medicare for 500 services in 2024, and Dr. Gardner accepts Medicare assignment.
How many Medicare patients does Dr. Ryan MacKenzie Gardner see?
CMS counts 69 Medicare patients who saw Dr. Gardner in 2024, with an average age of 72.
What services does Dr. Ryan MacKenzie Gardner bill to Medicare?
In 2024, Dr. Gardner's most billed Medicare services were critical care (99291), critical care (99292) and ultrasound (76937).
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Has Dr. Ryan MacKenzie Gardner received payments from drug or device companies?
CMS Open Payments shows $45 in general payments to Dr. Gardner from 2 companies from 2023 to 2025. The largest total came from Alnylam Pharmaceuticals Inc.
How long has Dr. Ryan MacKenzie Gardner been practicing?
Dr. Gardner graduated from medical school in 2017, 9 years ago.
Does Dr. Ryan MacKenzie Gardner do research?
Dmand AI links 8 publications to Dr. Gardner, published from 2019 to 2025.
Who does Dr. Ryan MacKenzie Gardner publish with?
Dr. Gardner's most frequent co-authors are Michael William Donnino, MD (4 shared papers), Katherine M. Berg, MD (2 shared papers) and Stephen Hallisey (2 shared papers).
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