Dr. Mariana S. Markell, MD
- Medicare services, 2024
- 66
- Medicare patients, 2024
- 55
- Part D claims, 2024
- 919
- Industry payments
- $17,158
- Affiliated sites
- 2
- Practice address
- 445 Lenox Rd, Brooklyn, NY 11203
- Practice phone
- Call (718) 826-4901
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
University Hospital at Downstate
Brooklyn, New York
Find Dr. Markell's professional email, personal email and mobile number
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Dr. Mariana S. Markell is a nephrologist in Brooklyn, New York
Dr. Markell practices at University Hospital at Downstate in Brooklyn, New York.
Dr. Markell's NPI, 1043204779, was assigned on September 8, 2005. Dr. Markell graduated from New York Medical College in 1981. Dr. Markell holds New York license 151748-1.
- NPI
- 1043204779NPI Registry (opens in a new tab)
- NPI enumeration date
- September 8, 2005
- NPI status
- Active
- Practice phone
- (718) 826-4901
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 71
- Medical school graduation
- 1981
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Mariana S. Markell practices at University Hospital at Downstate in Brooklyn, New York
Dr. Markell's primary practice is University Hospital at Downstate, at 445 Lenox Rd, Brooklyn, NY 11203 in Kings County. The practice phone is (718) 826-4901.
- University Hospital at Downstate445 Lenox Rd, Brooklyn, NY 11203 · Kings CountyPhone(718) 826-4901
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Mariana S. Markell is affiliated with 3 sites of care and 2 medical groups
Dr. Markell's primary practice is University Hospital at Downstate in Brooklyn, New York. The medical group on file is Downstate Health Physicians. Dmand AI also links Dr. Markell to 2 more group practices and clinics and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Mariana S. Markell's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Markell practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| University Hospital at Downstate | 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. Mariana S. Markell is one of 914 nephrologists in New York
Nephrology is Dr. Markell's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dr. Markell is licensed in New York.
Specialties and state licenses
- Nephrology, New YorkPrimary
Nephrologists near Dr. Markell
Counts of nephrologists 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. Mariana S. Markell billed Medicare for 66 services in 2024
CMS data shows 66 Medicare services from Dr. Markell across 2 procedure codes in 2024, all of them office visits, for 55 Medicare patients. Medicare paid $5,567 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Markell's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2592024: 6675%
Dr. Markell compared with the New York median for nephrologists, 2024
- Dr. Markell
- New York median
- Medicare services
- 66vs 68990% below
- Medicare patients
- 55vs 21775% below
- Part D claims
- 714vs 43664% above
Medians across 892 nephrologists in New York with Dmand AI profiles that report each measure.
Dr. Markell'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. Markell and other nephrologists in New York.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mariana S. Markell treated 55 Medicare patients in 2024, average age 60
CMS counts 55 Medicare patients who saw Dr. Markell in 2024. The largest group is under 65, with 33 patients. 75% of them have chronic kidney disease, and 75% have diabetes. 67% are also on Medicaid. Their average risk score is 6.19, 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. Markell's median patient age at 56, with 38% women.
Dr. Markell's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Markell's Medicare patients by sex, 2024
- Women2749%
- Men2851%
Chronic conditions among Dr. Markell's Medicare patients, 2024
- Chronic kidney disease75%
- Diabetes75%
- High blood pressure75%
- High cholesterol75%
- Heart failure45%
- Ischemic heart disease42%
- Arthritis40%
- Anxiety24%
Share of Medicare patients with each condition. A patient can have several.
Dr. Markell'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
- Women38%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mariana S. Markell wrote 919 Medicare Part D claims in 2024
In 2024, Dr. Markell wrote 919 Medicare Part D claims for 107 patients. 82% of them were for generic drugs. CMS names the drug for 714 of them, across 26 drugs with 11 or more claims each, at $64,976 in total drug cost. In 2023, CMS named 411 claims across 21 drugs.
Dr. Markell's Part D claims by kind of drug, 2024
- Generic751 claims82%
- Brand-name132 claims14%
- Other36 claims4%
Dr. Markell'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. Markell's Part D claims, 2024
- Antibiotics8%69 of 919 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: 4112024: 71474%
Drugs named by CMS: 26 in 2024, 21 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
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Dr. Mariana S. Markell received $17,158 in industry payments from 2016 to 2025
CMS Open Payments shows 27 general payments to Dr. Markell from 10 drug and device companies from 2016 to 2025. Speaker and faculty fees make up the largest share, 80% of the total. Mallinckrodt Enterprises LLC paid the most, $12,808.
General payments to Dr. Markell by program year, 2016 to 2025
General payments to Dr. Markell by kind, 2016 to 2025
- Speaker and faculty fees$13,70080%
- Consulting fees$1,5009%
- Food and beverage$1,2167%
- Travel and lodging$6704%
- Education$720%
Companies that paid Dr. Markell 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. Mariana S. Markell graduated from New York Medical College
Dr. Markell graduated from New York Medical College in 1981.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mariana S. Markell'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 DataDmand AI Affiliation 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) |
| 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. Mariana S. Markell
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. Mariana S. Markell's NPI number?
Dr. Mariana S. Markell's NPI number is 1043204779. It was assigned on September 8, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Mariana S. Markell?
Dr. Mariana S. Markell is a nephrologist in Brooklyn, New York. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).
Where does Dr. Mariana S. Markell practice?
Dr. Markell practices at 445 Lenox Rd, Brooklyn, NY 11203. Dr. Markell's primary practice is University Hospital at Downstate in Brooklyn, New York. Dmand AI also links Dr. Markell to 2 group practices and clinics and 1 medical group.
What is Dr. Mariana S. Markell's office phone number?
The practice phone on file for Dr. Markell is (718) 826-4901.
What is Dr. Mariana S. Markell's medical license number?
Dr. Markell holds New York license 151748-1.
What medical group is Dr. Mariana S. Markell part of?
Dr. Markell is linked to Downstate Health Physicians. Dmand AI links Dr. Markell to 1 more medical group.
Does Dr. Mariana S. Markell accept Medicare?
Yes. CMS data shows Dr. Markell billed Medicare for 66 services in 2024.
How many Medicare patients does Dr. Mariana S. Markell see?
CMS counts 55 Medicare patients who saw Dr. Markell in 2024, with an average age of 60.
What services does Dr. Mariana S. Markell bill to Medicare?
In 2024, Dr. Markell's most billed Medicare services were office visit, established patient (99214) and office visit, new patient (99204).
Where did Dr. Mariana S. Markell go to medical school?
Dr. Markell graduated from New York Medical College in 1981.
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What drugs does Dr. Mariana S. Markell prescribe most?
In 2024 Medicare Part D data, Dr. Markell's most prescribed drugs by claims were Esomeprazole Magnesium, Carvedilol and Sulfamethoxazole-Trimethoprim.
Has Dr. Mariana S. Markell received payments from drug or device companies?
CMS Open Payments shows $17,158 in general payments to Dr. Markell from 10 companies from 2016 to 2025. The largest total came from Mallinckrodt Enterprises LLC.
How long has Dr. Mariana S. Markell been practicing?
Dr. Markell graduated from medical school in 1981, 45 years ago.
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