Dr. Mark D. Fleming, MD
- Hospital affiliations
- 1
- Industry payments
- $52,553
- Medical group
- 1
- State license
- 1
- Year NPI issued
- 2006
- Practice address
- 300 Longwood Avenue, Boston, MA 02115
- Practice phone
- Call (617) 735-6000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Fleming'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. Mark D. Fleming is a hematology (pathology) physician in Boston, Massachusetts
Dr. Fleming practices at Boston Children's Hospital in Boston, Massachusetts, part of The Children's Hospital.
Dr. Fleming's NPI, 1235148404, was assigned on August 6, 2006. Dr. Fleming graduated from Harvard Medical School in 1993. Dr. Fleming holds Massachusetts license 153834.
- NPI
- 1235148404NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1254484496
- NPI enumeration date
- August 6, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (617) 735-6000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 59
- Medical school graduation
- 1993
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark D. Fleming practices at Boston Children's Hospital in Boston, Massachusetts
Dr. Fleming's primary practice is Boston Children's Hospital, at 300 Longwood Avenue, Boston, MA 02115 in Suffolk County. The practice phone is (617) 735-6000.
- Boston Children's Hospital300 Longwood Avenue, Boston, MA 02115 · Suffolk CountyPhone(617) 735-6000
Source: Dmand AI Affiliation Data
Dr. Mark D. Fleming is affiliated with 2 sites of care and 1 medical group
Dr. Fleming's primary practice is Boston Children's Hospital in Boston, Massachusetts, part of The Children's Hospital. The medical group on file is Boston Children's Hospital Department of Pathology. Dmand AI also links Dr. Fleming to 1 more dialysis center, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark D. Fleming's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Fleming practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Boston Children's Hospital | Available with a free account |
| +1 more affiliated site | 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 The Children's Hospital and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Mark D. Fleming is one of 11 hematology (pathology) physicians in Massachusetts
Hematology is Dr. Fleming's primary specialty in the NPI Registry, under taxonomy code 207ZH0000X. Dr. Fleming is licensed in Massachusetts.
Specialties and state licenses
- Hematology (pathology), MassachusettsPrimary
Hematology (pathology) physicians near Dr. Fleming
Counts of hematology (pathology) 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. Mark D. Fleming's patients have a median age of 10
Across all payers, Dmand AI patient panel data puts Dr. Fleming's median patient age at 10, with 39% women.
Dr. Fleming's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 10
Patient panel by sex, all payers
- Women39%
- Men61%
Source: Dmand AI Patient Panel Data
How Dr. Mark D. Fleming takes part in Medicare
Dr. Fleming 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)
Dr. Mark D. Fleming received $52,553 in industry payments from 2016 to 2025
CMS Open Payments shows 42 general payments to Dr. Fleming from 11 drug and device companies from 2016 to 2025. Consulting fees make up the largest share, 98% of the total. X4 Pharmaceuticals, Inc. paid the most, $20,250.
General payments to Dr. Fleming by program year, 2016 to 2025
General payments to Dr. Fleming by kind, 2016 to 2025
- Consulting fees$51,65098%
- Food and beverage$9032%
Companies that paid Dr. Fleming 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. Mark D. Fleming graduated from Harvard Medical School
Dr. Fleming graduated from Harvard Medical School in 1993.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark D. Fleming'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 patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| 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. Mark D. Fleming
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. Mark D. Fleming's NPI number?
Dr. Mark D. Fleming's NPI number is 1235148404. It was assigned on August 6, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark D. Fleming?
Dr. Mark D. Fleming is a hematology (pathology) physician in Boston, Massachusetts. The primary specialty in the NPI Registry is Hematology (Pathology) Physician (taxonomy code 207ZH0000X).
Where does Dr. Mark D. Fleming practice?
Dr. Fleming practices at 300 Longwood Avenue, Boston, MA 02115. Dr. Fleming's primary practice is Boston Children's Hospital in Boston, Massachusetts, part of The Children's Hospital. Dmand AI also links Dr. Fleming to 1 dialysis center.
What is Dr. Mark D. Fleming's office phone number?
The practice phone on file for Dr. Fleming is (617) 735-6000.
What is Dr. Mark D. Fleming's medical license number?
Dr. Fleming holds Massachusetts license 153834.
Which hospitals is Dr. Mark D. Fleming affiliated with?
Dr. Fleming practices at Boston Children's Hospital in Boston, Massachusetts.
What medical group is Dr. Mark D. Fleming part of?
Dr. Fleming is linked to Boston Children's Hospital Department of Pathology.
Does Dr. Mark D. Fleming accept Medicare?
Yes. CMS lists Dr. Fleming as accepting Medicare assignment.
Where did Dr. Mark D. Fleming go to medical school?
Dr. Fleming graduated from Harvard Medical School in 1993.
Has Dr. Mark D. Fleming received payments from drug or device companies?
CMS Open Payments shows $52,553 in general payments to Dr. Fleming from 11 companies from 2016 to 2025. The largest total came from X4 Pharmaceuticals, Inc.
How long has Dr. Mark D. Fleming been practicing?
Dr. Fleming graduated from medical school in 1993, 33 years ago.
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