Dr. Michael Joseph Demaria, MD
- Medicare services, 2023
- 382
- Part D claims, 2024
- 1,602
- Industry payments
- $119
- Affiliated sites
- 1
- Medical group
- 1
- Practice address
- 619 Fulton Ave, Hempstead, NY 11550
- Practice phone
- Call (516) 572-1300
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Harmony Healthcare Long Island - Hempstead
FQHC - Main Site · Hempstead, New York
Find Dr. Demaria'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. Michael Joseph Demaria is a gastroenterologist in Hempstead, New York
Dr. Demaria practices at Harmony Healthcare Long Island - Hempstead in Hempstead, New York.
Dr. Demaria's NPI, 1790780724, was assigned on June 16, 2005. Dr. Demaria graduated from McGill University Faculty of Medicine in 1983. Dr. Demaria's New York license number on file is 160671.
- NPI
- 1790780724NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3072757293
- NPI enumeration date
- June 16, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (516) 572-1300
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 69
- Medical school graduation
- 1983
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Michael Joseph Demaria practices at Harmony Healthcare Long Island - Hempstead in Hempstead, New York
Dr. Demaria's primary practice is Harmony Healthcare Long Island - Hempstead, at 619 Fulton Ave, Hempstead, NY 11550. The practice phone is (516) 572-1300.
- Harmony Healthcare Long Island - Hempstead619 Fulton Ave, Hempstead, NY 11550Phone(516) 572-1300
Source: Dmand AI Affiliation Data
Dr. Michael Joseph Demaria is affiliated with 1 site of care and 1 medical group
Dr. Demaria's primary practice is Harmony Healthcare Long Island - Hempstead in Hempstead, New York. The medical group on file is Harmony Healthcare Long Island. Dr. Demaria's employer is on file too: a community health center (fqhc).
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Michael Joseph Demaria's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Demaria practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Harmony Healthcare Long Island - Hempstead | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Michael Joseph Demaria is one of 1,583 gastroenterologists in New York
Gastroenterology is Dr. Demaria's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Demaria is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Dr. Demaria's licenses on file in 2 states: New York and New Jersey.
Specialties and state licenses
- Gastroenterology, New YorkPrimary
- New Jersey license
Clinical focus
Dmand AI lists acid reflux, chronic inflammatory bowel disease (IBD), colonoscopy, gastroenteritis, gastrointestinal bleeding, gastrointestinal inflammation, irritable bowel syndrome (IBS) and upper GI endoscopy among the conditions Dr. Demaria treats.
Gastroenterologists near Dr. Demaria
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. Michael Joseph Demaria billed Medicare for 382 services in 2023
CMS data shows 382 Medicare services from Dr. Demaria across 4 procedure codes in 2023. Medicare paid $49,141 for them. Every service was in an office.
Dr. Demaria's Medicare services by type, 2022 to 2023
- 2022
- 2023
- Office and hospital visits
- 2022: 1,4362023: 27981%
- Other services
- 2022: 3582023: 6283%
- Tests and treatments
- 2022: 2522023: 4184%
- Surgery
- 2022: 372023: 0100%
Dr. Demaria compared with the New York median for gastroenterologists, 2023
- Dr. Demaria
- New York median
- Medicare services
- 382vs 4219% below
- Part D claims
- 1,167vs 3823.1 times
Medians across 1,551 gastroenterologists in New York with Dmand AI profiles that report each measure.
Dr. Demaria'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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Demaria and other gastroenterologists in New York.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Michael Joseph Demaria's patients have a median age of 56
Across all payers, Dmand AI patient panel data puts Dr. Demaria's median patient age at 56, with 58% women.
Dr. Demaria's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 56
Patient panel by sex, all payers
- Women58%
- Men41%
Source: Dmand AI Patient Panel Data
Dr. Michael Joseph Demaria wrote 1,602 Medicare Part D claims in 2024
In 2024, Dr. Demaria wrote 1,602 Medicare Part D claims for 178 patients. 88% of them were for generic drugs. CMS names the drug for 1,167 of them, across 32 drugs with 11 or more claims each, at $81,464 in total drug cost. In 2023, CMS named 3,040 claims across 71 drugs.
Dr. Demaria's Part D claims by kind of drug, 2024
- Generic1,410 claims88%
- Brand-name and other192 claims12%
Dr. Demaria'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. Demaria's Part D claims, 2024
- Antibiotics1%16 of 1,602 claims
- Antipsychotics, patients 65 and over1%14 of 1,602 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 3,0402024: 1,16762%
Drugs named by CMS: 32 in 2024, 71 in 2023.
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
How Dr. Michael Joseph Demaria takes part in Medicare
Dr. Demaria 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. Michael Joseph Demaria received $119 in industry payments from 2016 to 2025
CMS Open Payments shows 6 general payments to Dr. Demaria from 5 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Ironwood Pharmaceuticals, Inc paid the most, $33.
General payments to Dr. Demaria by program year, 2016 to 2025
Companies that paid Dr. Demaria 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. Michael Joseph Demaria graduated from McGill University Faculty of Medicine
Dr. Demaria graduated from McGill University Faculty of Medicine in 1983.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Michael Joseph Demaria accepts plans from 8 insurance carriers
Dr. Demaria is in network with 8 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- Cigna
- HCSC
- Regence Health Plans
- CMS Medicare
- NY State Medicaid
Plan types Dr. Demaria accepts, by number of carriers
- Medicare7
- PPO6
- HMO2
- POS2
- EPO1
- Medicaid1
Source: Dmand AI Insurance Network Data
Sources for Dr. Michael Joseph Demaria'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 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) |
| 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 |
| 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. Michael Joseph Demaria
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. Michael Joseph Demaria's NPI number?
Dr. Michael Joseph Demaria's NPI number is 1790780724. It was assigned on June 16, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Michael Joseph Demaria?
Dr. Michael Joseph Demaria is a gastroenterologist in Hempstead, New York. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Michael Joseph Demaria practice?
Dr. Demaria practices at 619 Fulton Ave, Hempstead, NY 11550. Dr. Demaria's primary practice is Harmony Healthcare Long Island - Hempstead in Hempstead, New York.
What is Dr. Michael Joseph Demaria's office phone number?
The practice phone on file for Dr. Demaria is (516) 572-1300.
What is Dr. Michael Joseph Demaria's medical license number?
Dr. Demaria's New York license number on file is 160671, one of the licenses on file in 2 states.
Which states has Dr. Michael Joseph Demaria been licensed in?
Dmand AI has state licenses on file for Dr. Demaria in New York (1984 to 2025) and New Jersey (1988 to 1991).
What medical group is Dr. Michael Joseph Demaria part of?
Dr. Demaria is linked to Harmony Healthcare Long Island.
Does Dr. Michael Joseph Demaria accept Medicare?
Yes. CMS data shows Dr. Demaria billed Medicare for 382 services in 2023, and Dr. Demaria accepts Medicare assignment.
Is Dr. Michael Joseph Demaria board certified?
Yes. Dr. Demaria is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Michael Joseph Demaria bill to Medicare?
In 2023, Dr. Demaria's most billed Medicare services were office visit, established patient (99215), medicare service (G0439) and office visit, established patient (99213).
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Where did Dr. Michael Joseph Demaria go to medical school?
Dr. Demaria graduated from McGill University Faculty of Medicine in 1983.
What drugs does Dr. Michael Joseph Demaria prescribe most?
In 2024 Medicare Part D data, Dr. Demaria's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Metformin HCl.
Has Dr. Michael Joseph Demaria received payments from drug or device companies?
CMS Open Payments shows $119 in general payments to Dr. Demaria from 5 companies from 2016 to 2025. The largest total came from Ironwood Pharmaceuticals, Inc.
How long has Dr. Michael Joseph Demaria been practicing?
Dr. Demaria graduated from medical school in 1983, 43 years ago.
What insurance does Dr. Michael Joseph Demaria accept?
Dr. Demaria is in network with 8 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
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