Dr. Ellen Milagros Marchese, MD
- Medicare services, 2024
- 612
- Medicare patients, 2024
- 368
- Part D claims, 2024
- 178
- Hospital affiliations
- 1
- Industry payments
- $1,016
- Practice address
- One Healthy Way, Oceanside, NY 11572
- Practice phone
- Call (516) 632-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Marchese's professional email, personal email and mobile number
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Dr. Ellen Milagros Marchese is an infectious disease specialist in Oceanside, New York
Dr. Marchese practices at Mount Sinai South Nassau in Oceanside, New York, part of Mount Sinai Health System.
Dr. Marchese's NPI, 1730309907, was assigned on April 27, 2007. Dr. Marchese graduated from Ponce Health Sciences University in 2001. Dr. Marchese holds New York license 243318.
- NPI
- 1730309907NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4284720673
- NPI enumeration date
- April 27, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (516) 632-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 51
- Medical school graduation
- 2001
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Ellen Milagros Marchese practices at 2 locations in Oceanside, New York
Dr. Marchese's primary practice is Mount Sinai South Nassau, at One Healthy Way, Oceanside, NY 11572 in Nassau County. The practice phone is (516) 632-3000. Dr. Marchese also practices at South Nassau Communities Hospital, 1 Healthy Way, Oceanside, NY 11572.
- Mount Sinai South NassauPrimaryOne Healthy Way, Oceanside, NY 11572 · Nassau CountyPhone(516) 632-3000
- South Nassau Communities Hospital1 Healthy Way, Oceanside, NY 11572 · Nassau CountyPhone(516) 632-3000
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Dr. Ellen Milagros Marchese is affiliated with 3 sites of care and 2 medical groups
Dr. Marchese's primary practice is Mount Sinai South Nassau in Oceanside, New York, part of Mount Sinai Health System. The medical group on file is Nassau ID Physicians. Dmand AI also links Dr. Marchese to 2 more group practices and clinics 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. Ellen Milagros Marchese's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Marchese practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mount Sinai South Nassau | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Ellen Milagros Marchese is one of 825 infectious disease specialists in New York
Infectious disease is Dr. Marchese's primary specialty in the NPI Registry, under taxonomy code 207RI0200X. Dr. Marchese is licensed in New York.
Specialties and state licenses
- Infectious disease, New YorkPrimary
Infectious disease specialists near Dr. Marchese
Counts of infectious disease specialists 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. Ellen Milagros Marchese billed Medicare for 612 services in 2024
CMS data shows 612 Medicare services from Dr. Marchese across 6 procedure codes in 2024, for 368 Medicare patients. Medicare paid $56,533 for them.
Dr. Marchese's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 5422024: 61213%
Where Dr. Marchese's Medicare services took place, 2024
- In an office12320%
- In a facility48980%
Dr. Marchese compared with the New York median for infectious disease specialists, 2024
- Dr. Marchese
- New York median
- Medicare services
- 612vs 2382.6 times
- Medicare patients
- 368vs 1342.7 times
- Part D claims
- 33vs 16280% below
Medians across 791 infectious disease specialists in New York with Dmand AI profiles that report each measure.
Dr. Marchese'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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Marchese and other infectious disease specialists in New York.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Ellen Milagros Marchese treated 368 Medicare patients in 2024, average age 80
CMS counts 368 Medicare patients who saw Dr. Marchese in 2024. The largest group is 85 and over, with 138 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 37% are also on Medicaid. Their average risk score is 3.04, 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. Marchese's median patient age at 59, with 44% women.
Dr. Marchese's Medicare patients by age, 2024
Dr. Marchese's Medicare patients by sex, 2024
- Women17648%
- Men19252%
Chronic conditions among Dr. Marchese's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes64%
- Arthritis56%
- Ischemic heart disease54%
- Heart failure52%
- Mood disorders52%
- Chronic kidney disease51%
Share of Medicare patients with each condition. A patient can have several.
Dr. Marchese's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 59
Patient panel by sex, all payers
- Women44%
- Men55%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Ellen Milagros Marchese wrote 178 Medicare Part D claims in 2024
In 2024, Dr. Marchese wrote 178 Medicare Part D claims for 28 patients. 79% of them were for generic drugs. CMS names the drug for 33 of them, across 2 drugs with 11 or more claims each, at $112,710 in total drug cost. In 2023, CMS named 12 claims across 1 drug.
Dr. Marchese's Part D claims by kind of drug, 2024
- Generic141 claims79%
- Brand-name37 claims21%
Dr. Marchese'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. Marchese's Part D claims, 2024
- Antibiotics18%32 of 178 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: 122024: 33175%
Drugs named by CMS: 2 in 2024, 1 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
Dr. Ellen Milagros Marchese offers telehealth to Medicare patients
Dr. Marchese accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Marchese as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Ellen Milagros Marchese received $1,016 in industry payments from 2016 to 2024
CMS Open Payments shows 20 general payments to Dr. Marchese from 6 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 61% of the total. Janssen Pharmaceuticals, Inc paid the most, $399.
General payments to Dr. Marchese by program year, 2016 to 2024
General payments to Dr. Marchese by kind, 2016 to 2024
- Food and beverage$61761%
- Education$39939%
Companies that paid Dr. Marchese the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Ellen Milagros Marchese graduated from Ponce Health Sciences University
Dr. Marchese graduated from Ponce Health Sciences University in 2001.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Ellen Milagros Marchese'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 Affiliation DataDmand AI Practice 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) |
| 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 |
| 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. Ellen Milagros Marchese
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. Ellen Milagros Marchese's NPI number?
Dr. Ellen Milagros Marchese's NPI number is 1730309907. It was assigned on April 27, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Ellen Milagros Marchese?
Dr. Ellen Milagros Marchese is an infectious disease specialist in Oceanside, New York. The primary specialty in the NPI Registry is Infectious Disease Physician (taxonomy code 207RI0200X).
Where does Dr. Ellen Milagros Marchese practice?
Dr. Marchese practices at One Healthy Way, Oceanside, NY 11572. Dr. Marchese also practices at 1 Healthy Way, Oceanside, NY 11572. Dr. Marchese's primary practice is Mount Sinai South Nassau in Oceanside, New York, part of Mount Sinai Health System. Dmand AI also links Dr. Marchese to 2 group practices and clinics and 1 medical group.
What is Dr. Ellen Milagros Marchese's office phone number?
The practice phone on file for Dr. Marchese is (516) 632-3000.
What is Dr. Ellen Milagros Marchese's medical license number?
Dr. Marchese holds New York license 243318.
Which hospitals is Dr. Ellen Milagros Marchese affiliated with?
Dr. Marchese practices at Mount Sinai South Nassau in Oceanside, New York.
What medical group is Dr. Ellen Milagros Marchese part of?
Dr. Marchese is linked to Nassau ID Physicians. Dmand AI links Dr. Marchese to 1 more medical group.
Does Dr. Ellen Milagros Marchese accept Medicare?
Yes. CMS data shows Dr. Marchese billed Medicare for 612 services in 2024, and Dr. Marchese accepts Medicare assignment.
Does Dr. Ellen Milagros Marchese offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Marchese as offering telehealth services.
How many Medicare patients does Dr. Ellen Milagros Marchese see?
CMS counts 368 Medicare patients who saw Dr. Marchese in 2024, with an average age of 80.
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What services does Dr. Ellen Milagros Marchese bill to Medicare?
In 2024, Dr. Marchese's most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99222) and nursing facility care (99305).
Where did Dr. Ellen Milagros Marchese go to medical school?
Dr. Marchese graduated from Ponce Health Sciences University in 2001.
What drugs does Dr. Ellen Milagros Marchese prescribe most?
In 2024 Medicare Part D data, Dr. Marchese's most prescribed drugs by claims were Biktarvy and Lisinopril.
Has Dr. Ellen Milagros Marchese received payments from drug or device companies?
CMS Open Payments shows $1,016 in general payments to Dr. Marchese from 6 companies from 2016 to 2024. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. Ellen Milagros Marchese been practicing?
Dr. Marchese graduated from medical school in 2001, 25 years ago.
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