Am J Physiol Cell Physiol
Adenosine TriphosphateCaco-2 CellsCalcium
Dr. Mark Donowitz, MD
NPI1306893342
- Medicare services, 2023
- 48
- Part D claims, 2024
- 12
- Publications
- 250
- Industry payments
- $3,980
- Insurance carriers
- 4
- Practice address
- 5255 Loughboro NW Rd, Washington, DC 20016
- Practice phone
- Call (202) 537-4680
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Sibley Memorial Hospital
Washington, District of Columbia
Find Dr. Donowitz's professional email, personal email and mobile number
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Dr. Mark Donowitz is a gastroenterologist in Washington, District of Columbia
Dr. Donowitz practices at Sibley Memorial Hospital in Washington, District of Columbia.
Dr. Donowitz's NPI, 1306893342, was assigned on May 27, 2006. Dr. Donowitz graduated from The Johns Hopkins University School of Medicine in 1968. Dr. Donowitz holds Maryland license D02767.
NPI and contact details
- NPI
- 1306893342NPI Registry (opens in a new tab)
- NPI enumeration date
- May 27, 2006
- NPI status
- Active
- Practice phone
- (202) 537-4680
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 84
- Medical school graduation
- 1968
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Mark Donowitz practices at Sibley Memorial Hospital in Washington, District of Columbia
Dr. Donowitz's primary practice is Sibley Memorial Hospital, at 5255 Loughboro NW Rd, Washington, DC 20016 in District Of Columbia County. The practice phone is (202) 537-4680.
- Sibley Memorial Hospital5255 Loughboro NW Rd, Washington, DC 20016 · District Of Columbia CountyPhone(202) 537-4680
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Mark Donowitz is affiliated with 1 site of care
Dr. Donowitz's primary practice is Sibley Memorial Hospital in Washington, District of Columbia.
Sibley Memorial HospitalPrimary
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. Mark Donowitz's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Donowitz practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Sibley Memorial Hospital | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark Donowitz is one of 76 gastroenterologists in District of Columbia
Gastroenterology is Dr. Donowitz's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Donowitz is board certified in gastroenterology by the American Board of Internal Medicine. Dr. Donowitz is licensed in Maryland.
Specialties and state licenses
- Gastroenterology, MarylandPrimary
Clinical focus
Dmand AI lists acid reflux, gastroduodenitis, gastroenteritis, intestinal or bowel obstruction and irritable bowel syndrome (IBS) among the conditions Dr. Donowitz treats.
Gastroenterologists near Dr. Donowitz
Counts of gastroenterologists 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 Donowitz billed Medicare for 48 services in 2023
CMS data shows 48 Medicare services from Dr. Donowitz across 2 procedure codes in 2023, all of them office visits. Medicare paid $2,779 for them.
Medicare services, 202348
Paid by Medicare$2,779
Procedure codes2
Dr. Donowitz's Medicare services by type, 2022 to 2023
- 2022
- 2023
- Office and hospital visits
- 2022: 822023: 4841%
Where Dr. Donowitz's Medicare services took place, 2023
- In an office1633%
- In a facility3267%
Dr. Donowitz compared with the District of Columbia median for gastroenterologists, 2023
- Dr. Donowitz
- District of Columbia median
- Medicare services
- 48vs 29884% below
- Part D claims
- 85vs 12532% below
Medians across 67 gastroenterologists in District of Columbia with Dmand AI profiles that report each measure.
Dr. Donowitz's most billed Medicare procedure codes, 2023
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. Donowitz?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Donowitz and other gastroenterologists in District of Columbia.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark Donowitz's patients have a median age of 69
Across all payers, Dmand AI patient panel data puts Dr. Donowitz's median patient age at 69, with 60% women.
Dr. Donowitz's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women60%
- Men40%
Source: Dmand AI Patient Panel Data
Dr. Mark Donowitz wrote 12 Medicare Part D claims in 2024
In 2024, Dr. Donowitz wrote 12 Medicare Part D claims. They cover 5 drugs, with $402,299 in total drug cost. In 2022, CMS named 99 claims across 6 drugs.
Part D claims, 202412
Drugs named by CMS5
Total drug cost$402,299
Dr. Donowitz's most prescribed drugs by claims, 2023
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, 2022 to 2023
- 2022
- 2023
- Claims for drugs CMS names
- 2022: 992023: 8514%
Drugs named by CMS: 5 in 2023, 6 in 2022.
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
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Dr. Mark Donowitz has 250 publications on record
Dmand AI links 250 papers to Dr. Donowitz, published from 2001 to 2025. 2017 was the busiest year, with 15. The most frequent topics are Sodium-Hydrogen Exchangers, Sodium-Hydrogen Exchanger 3 and Intestinal Mucosa. Dr. Donowitz has published most often in Am J Physiol. Dr. Donowitz's most frequent co-authors are Jianyi Yin, James Richard Broughman, MD and Steven Ross Brant, MD.
Papers250
Years published2001 to 2025
Dr. Donowitz's papers by year, 2016 to 2025
Topics Dr. Donowitz writes about most
- Sodium-Hydrogen Exchangers
- Sodium-Hydrogen Exchanger 3
- Intestinal Mucosa
- Rabbits
- Microvilli
- Sodium
- Calcium
- Diarrhea
Dr. Donowitz's most frequent co-authors
- Jianyi Yin22 shared papers
- James Richard Broughman, MD7 shared papers
- Steven Ross Brant, MD5 shared papers
Recent publications by Dr. Donowitz
Drug Metab Dispos
Administration, OralBiological TransportCells, Cultured
See who Dr. Donowitz researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Donowitz works with, so you can find a warm path to the right gastroenterologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Mark Donowitz received $3,980 in industry payments from 2017 to 2021
CMS Open Payments shows 3 general payments to Dr. Donowitz from 3 drug and device companies from 2017 to 2021. Consulting fees make up the largest share, 91% of the total. Eli Lilly and Company paid the most, $3,625.
General payments to Dr. Donowitz by program year, 2017 to 2021
General payments to Dr. Donowitz by kind, 2017 to 2021
$4Kin total
- Consulting fees$3,62591%
- Education$3399%
- Food and beverage$160%
Companies that paid Dr. Donowitz the most, 2017 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark Donowitz has 6 awards and honors on record
Dmand AI lists 6 awards for Dr. Donowitz, most recently CMS Stage 1 EHR in 2014.
Awards and honors for Dr. Donowitz
- 2014
- CMS Stage 1 EHR
- 2007
- Lecturer
- President
- 2006
- AGA Fellow
- 1990
- Member
- 1983
- ASCI Member
Source: Dmand AI Professional Profile Data
Dr. Mark Donowitz graduated from The Johns Hopkins University School of Medicine
Dr. Donowitz graduated from The Johns Hopkins University School of Medicine in 1968. Dr. Donowitz is a member of AGA.
- Medical school
- Board certified in gastroenterology
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Mark Donowitz accepts plans from 4 insurance carriers
Dr. Donowitz is in network with 4 carriers, including Elevance, Blue Cross Blue Shield of Michigan and CareFirst BlueCross BlueShield. PPO plans come from the most carriers, 3. Check the plan with the practice before a visit.
- Elevance
- Blue Cross Blue Shield of Michigan
- CareFirst BlueCross BlueShield
- DE State Medicaid
Plan types Dr. Donowitz accepts, by number of carriers
- PPO3
- HMO2
- POS2
- EPO1
- Medicaid1
- Medicare1
Source: Dmand AI Insurance Network Data
Sources for Dr. Mark Donowitz'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 Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice 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 Data |
| 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) |
| 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) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network 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 Donowitz
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 Donowitz's NPI number?
Dr. Mark Donowitz's NPI number is 1306893342. It was assigned on May 27, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark Donowitz?
Dr. Mark Donowitz is a gastroenterologist in Washington, District of Columbia. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Mark Donowitz practice?
Dr. Donowitz practices at 5255 Loughboro NW Rd, Washington, DC 20016. Dr. Donowitz's primary practice is Sibley Memorial Hospital in Washington, District of Columbia.
What is Dr. Mark Donowitz's office phone number?
The practice phone on file for Dr. Donowitz is (202) 537-4680.
What is Dr. Mark Donowitz's medical license number?
Dr. Donowitz holds Maryland license D02767.
Does Dr. Mark Donowitz accept Medicare?
Yes. CMS data shows Dr. Donowitz billed Medicare for 48 services in 2023.
Is Dr. Mark Donowitz board certified?
Yes. Dr. Donowitz is board certified in gastroenterology by the American Board of Internal Medicine.
What services does Dr. Mark Donowitz bill to Medicare?
In 2023, Dr. Donowitz's most billed Medicare services were office visit, established patient (99213) and office visit, established patient (99214).
Where did Dr. Mark Donowitz go to medical school?
Dr. Donowitz graduated from The Johns Hopkins University School of Medicine in 1968.
What drugs does Dr. Mark Donowitz prescribe most?
In 2023 Medicare Part D data, Dr. Donowitz's most prescribed drugs by claims were Famotidine, Loperamide and Stelara.
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Has Dr. Mark Donowitz received payments from drug or device companies?
CMS Open Payments shows $3,980 in general payments to Dr. Donowitz from 3 companies from 2017 to 2021. The largest total came from Eli Lilly and Company.
How long has Dr. Mark Donowitz been practicing?
Dr. Donowitz graduated from medical school in 1968, 58 years ago.
Does Dr. Mark Donowitz do research?
Dmand AI links 250 publications to Dr. Donowitz, published from 2001 to 2025.
Who does Dr. Mark Donowitz publish with?
Dr. Donowitz's most frequent co-authors are Jianyi Yin (22 shared papers), James Richard Broughman, MD (7 shared papers) and Steven Ross Brant, MD (5 shared papers).
What insurance does Dr. Mark Donowitz accept?
Dr. Donowitz is in network with 4 carriers, including Elevance, Blue Cross Blue Shield of Michigan and CareFirst BlueCross BlueShield. PPO plans come from the most carriers, 3. Check the plan with the practice before a visit.
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