Dr. John Leclerc Walsh, MD
- Medicare services, 2024
- 17
- Medicare patients, 2024
- 88
- Hospital affiliations
- 1
- Industry payments
- $212
- Medical groups
- 2
- Practice address
- 55 Fruit Street, Boston, MA 02114
- Practice phone
- Call (617) 726-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Walsh's professional email, personal email and mobile number
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Dr. John Leclerc Walsh is an anesthesiologist in Boston, Massachusetts
Dr. Walsh practices at Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham.
Dr. Walsh's NPI, 1033109202, was assigned on October 27, 2005. Dr. Walsh graduated from Yale University School of Medicine in 1992. Dr. Walsh holds Massachusetts license 78512.
- NPI
- 1033109202NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3072708874
- NPI enumeration date
- October 27, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (617) 726-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 60
- Medical school graduation
- 1992
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John Leclerc Walsh practices at Massachusetts General Hospital in Boston, Massachusetts
Dr. Walsh's primary practice is Massachusetts General Hospital, at 55 Fruit Street, Boston, MA 02114 in Suffolk County. The practice phone is (617) 726-2000.
- Massachusetts General Hospital55 Fruit Street, Boston, MA 02114 · Suffolk CountyPhone(617) 726-2000
Source: Dmand AI Affiliation Data
Dr. John Leclerc Walsh is affiliated with 2 sites of care and 2 medical groups
Dr. Walsh's primary practice is Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham. The medical group on file is Massachusetts General Physicians Organization (MGPO). Dmand AI also links Dr. Walsh to 1 more community health center and 1 medical group, 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 Leclerc Walsh's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Walsh practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Massachusetts General Hospital | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John Leclerc Walsh is one of 1,552 anesthesiologists in Massachusetts
Anesthesiology is Dr. Walsh's primary specialty in the NPI Registry, under taxonomy code 207L00000X. Dr. Walsh is licensed in Massachusetts.
Specialties and state licenses
- Anesthesiology, MassachusettsPrimary
Anesthesiologists near Dr. Walsh
Counts of anesthesiologists 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 Leclerc Walsh billed Medicare for 17 services in 2024
CMS data shows 17 Medicare services from Dr. Walsh across 1 procedure code in 2024, for 88 Medicare patients. Medicare paid $4,060 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Walsh's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Anesthesia
- 2023: 292024: 1741%
Dr. Walsh compared with the Massachusetts median for anesthesiologists, 2024
- Dr. Walsh
- Massachusetts median
- Medicare services
- 17vs 12687% below
- Medicare patients
- 88vs 20056% below
Medians across 1,366 anesthesiologists in Massachusetts with Dmand AI profiles that report each measure.
Dr. Walsh'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. Walsh?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Walsh and other anesthesiologists in Massachusetts.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John Leclerc Walsh treated 88 Medicare patients in 2024, average age 72
CMS counts 88 Medicare patients who saw Dr. Walsh in 2024. The largest group is 65 to 74, with 40 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 22% are also on Medicaid. Their average risk score is 2.27, 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. Walsh's median patient age at 63, with 37% women.
Dr. Walsh's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Walsh's Medicare patients by sex, 2024
- Women4753%
- Men4147%
Chronic conditions among Dr. Walsh's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis45%
- Chronic kidney disease40%
- Ischemic heart disease40%
- Anxiety34%
- Diabetes33%
- Cancer31%
Share of Medicare patients with each condition. A patient can have several.
Dr. Walsh'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
- Women37%
- Men63%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
How Dr. John Leclerc Walsh takes part in Medicare
Dr. Walsh 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. John Leclerc Walsh received $212 in industry payments in 2025
CMS Open Payments shows 2 general payments to Dr. Walsh from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Octapharma USA, Inc. paid the most, $212.
Companies that paid Dr. Walsh the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John Leclerc Walsh graduated from Yale University School of Medicine
Dr. Walsh graduated from Yale University School of Medicine in 1992.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John Leclerc Walsh'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) |
| 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 Leclerc Walsh
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 Leclerc Walsh's NPI number?
Dr. John Leclerc Walsh's NPI number is 1033109202. It was assigned on October 27, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. John Leclerc Walsh?
Dr. John Leclerc Walsh is an anesthesiologist in Boston, Massachusetts. The primary specialty in the NPI Registry is Anesthesiology Physician (taxonomy code 207L00000X).
Where does Dr. John Leclerc Walsh practice?
Dr. Walsh practices at 55 Fruit Street, Boston, MA 02114. Dr. Walsh's primary practice is Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham. Dmand AI also links Dr. Walsh to 1 community health center and 1 medical group.
What is Dr. John Leclerc Walsh's office phone number?
The practice phone on file for Dr. Walsh is (617) 726-2000.
What is Dr. John Leclerc Walsh's medical license number?
Dr. Walsh holds Massachusetts license 78512.
Which hospitals is Dr. John Leclerc Walsh affiliated with?
Dr. Walsh practices at Massachusetts General Hospital in Boston, Massachusetts.
What medical group is Dr. John Leclerc Walsh part of?
Dr. Walsh is linked to Massachusetts General Physicians Organization (MGPO). Dmand AI links Dr. Walsh to 1 more medical group.
Does Dr. John Leclerc Walsh accept Medicare?
Yes. CMS data shows Dr. Walsh billed Medicare for 17 services in 2024, and Dr. Walsh accepts Medicare assignment.
How many Medicare patients does Dr. John Leclerc Walsh see?
CMS counts 88 Medicare patients who saw Dr. Walsh in 2024, with an average age of 72.
What services does Dr. John Leclerc Walsh bill to Medicare?
In 2024, Dr. Walsh's most billed Medicare services were anesthesia (00790).
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Where did Dr. John Leclerc Walsh go to medical school?
Dr. Walsh graduated from Yale University School of Medicine in 1992.
Has Dr. John Leclerc Walsh received payments from drug or device companies?
CMS Open Payments shows $212 in general payments to Dr. Walsh from 1 company from 2025 to 2025. The largest total came from Octapharma USA, Inc.
How long has Dr. John Leclerc Walsh been practicing?
Dr. Walsh graduated from medical school in 1992, 34 years ago.
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