Dr. Lenar Tatios Yessayan, MD
- Medicare services, 2024
- 286
- Medicare patients, 2024
- 66
- Part D claims, 2024
- 34
- Publications
- 52
- Hospital affiliations
- 1
- Practice address
- 1500 E Medical Center Dr, Ann Arbor, MI 48109
- Practice phone
- Call (734) 936-4000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
University Hospital
School-Based Health Center · Ann Arbor, Michigan
Find Dr. Yessayan's professional email, personal email and mobile number
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Dr. Lenar Tatios Yessayan is a nephrologist in Ann Arbor, Michigan
Dr. Yessayan practices at University Hospital in Ann Arbor, Michigan.
Dr. Yessayan's NPI, 1023210861, was assigned on June 4, 2007. Dr. Yessayan holds Michigan license 4301082653.
- NPI
- 1023210861NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3779638747
- NPI enumeration date
- June 4, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (734) 936-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- 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. Lenar Tatios Yessayan practices at University Hospital in Ann Arbor, Michigan
Dr. Yessayan's primary practice is University Hospital, at 1500 E Medical Center Dr, Ann Arbor, MI 48109. The practice phone is (734) 936-4000.
- University Hospital1500 E Medical Center Dr, Ann Arbor, MI 48109Phone(734) 936-4000
Source: Dmand AI Affiliation Data
Dr. Lenar Tatios Yessayan is affiliated with 3 sites of care and 1 medical group
Dr. Yessayan's primary practice is University Hospital in Ann Arbor, Michigan. Dr. Yessayan is also affiliated with University Hospital. The medical group on file is University of Michigan Health. Dmand AI also links Dr. Yessayan to 1 more dialysis center, named with a free account. Dr. Yessayan's employer is on file too: a school & student health.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Lenar Tatios Yessayan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Yessayan practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| University Hospital | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Lenar Tatios Yessayan is one of 310 nephrologists in Michigan
Nephrology is Dr. Yessayan's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dr. Yessayan is board certified in nephrology by the American Board of Internal Medicine. Dr. Yessayan is licensed in Michigan.
Specialties and state licenses
- Nephrology, MichiganPrimary
Nephrologists near Dr. Yessayan
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. Lenar Tatios Yessayan billed Medicare for 286 services in 2024
CMS data shows 286 Medicare services from Dr. Yessayan across 4 procedure codes in 2024, for 66 Medicare patients. Medicare paid $36,508 for them.
Dr. Yessayan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3422024: 21936%
- Tests and treatments
- 2023: 1232024: 6746%
Where Dr. Yessayan's Medicare services took place, 2024
- In an office6723%
- In a facility21977%
Dr. Yessayan compared with the Michigan median for nephrologists, 2024
- Dr. Yessayan
- Michigan median
- Medicare services
- 286vs 84966% below
- Medicare patients
- 66vs 26975% below
- Part D claims
- 11vs 57498% below
Medians across 310 nephrologists in Michigan with Dmand AI profiles that report each measure.
Dr. Yessayan'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.
Need commercial claims for Dr. Yessayan?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Yessayan and other nephrologists in Michigan.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Lenar Tatios Yessayan treated 66 Medicare patients in 2024, average age 64
CMS counts 66 Medicare patients who saw Dr. Yessayan in 2024. The largest group is under 65, with 27 patients. 75% of them have chronic kidney disease, and 75% have heart failure. 39% are also on Medicaid. Their average risk score is 8.66, 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. Yessayan's median patient age at 63, with 43% women.
Dr. Yessayan's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Yessayan's Medicare patients by sex, 2024
- Women2944%
- Men3756%
Chronic conditions among Dr. Yessayan's Medicare patients, 2024
- Chronic kidney disease75%
- Heart failure75%
- High blood pressure75%
- High cholesterol75%
- Diabetes74%
- Atrial fibrillation68%
- Ischemic heart disease67%
- Arthritis44%
Share of Medicare patients with each condition. A patient can have several.
Dr. Yessayan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 63
Patient panel by sex, all payers
- Women43%
- Men57%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Lenar Tatios Yessayan wrote 34 Medicare Part D claims in 2024
In 2024, Dr. Yessayan wrote 34 Medicare Part D claims. 68% of them were for generic drugs. CMS names the drug for 11 of them, across 1 drug with 11 or more claims each, at $6,112 in total drug cost. In 2018, CMS named 11 claims across 1 drug.
Dr. Yessayan's Part D claims by kind of drug, 2024
- Generic23 claims68%
- Brand-name11 claims32%
Dr. Yessayan'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.
Part D claims for drugs CMS names, 2018 to 2024
- 2018
- 2024
- Claims for drugs CMS names
- 2018: 112024: 11No change
Drugs named by CMS: 1 in 2024, 1 in 2018.
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. Lenar Tatios Yessayan takes part in Medicare
Dr. Yessayan 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. Lenar Tatios Yessayan has 52 publications on record
Dmand AI links 52 papers to Dr. Yessayan, published from 2016 to 2025. 2021 was the busiest year, with 9. The most frequent topics are Acute Kidney Injury, Renal Dialysis and Continuous Renal Replacement Therapy. Dr. Yessayan has published most often in ASAIO J. Dr. Yessayan's most frequent co-authors are Michael Heung, MD, Harvey David Humes, MD and Stuart L. Goldstein, MD.
Dr. Yessayan's papers by year, 2016 to 2025
Topics Dr. Yessayan writes about most
- Acute Kidney Injury
- Renal Dialysis
- Continuous Renal Replacement Therapy
- Renal Replacement Therapy
- Critical Illness
- Anticoagulants
- COVID-19
- Intensive Care Units
Dr. Yessayan's most frequent co-authors
- Michael Heung, MD15 shared papers
- Harvey David Humes, MD12 shared papers
- Stuart L. Goldstein, MD5 shared papers
Recent publications by Dr. Yessayan
Clin J Am Soc Nephrol
See who Dr. Yessayan researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Yessayan works with, so you can find a warm path to the right nephrologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Lenar Tatios Yessayan received $40,673 in industry payments from 2016 to 2025
CMS Open Payments shows 71 general payments to Dr. Yessayan from 8 drug and device companies from 2016 to 2025. Education make up the largest share, 51% of the total. Vantive US Healthcare LLC paid the most, $24,380.
General payments to Dr. Yessayan by program year, 2016 to 2025
General payments to Dr. Yessayan by kind, 2016 to 2025
- Education$20,64951%
- Consulting fees$6,80017%
- Compensation for serving as faculty or as a speaker for a medical education program$5,74914%
- Travel and lodging$4,17510%
- Food and beverage$3,2998%
Companies that paid Dr. Yessayan 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. Lenar Tatios Yessayan is board certified in nephrology
- Board certified in nephrology
Source: Dmand AI Professional Profile Data
Sources for Dr. Lenar Tatios Yessayan'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 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) |
| 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) |
| 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. Lenar Tatios Yessayan
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. Lenar Tatios Yessayan's NPI number?
Dr. Lenar Tatios Yessayan's NPI number is 1023210861. It was assigned on June 4, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Lenar Tatios Yessayan?
Dr. Lenar Tatios Yessayan is a nephrologist in Ann Arbor, Michigan. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).
Where does Dr. Lenar Tatios Yessayan practice?
Dr. Yessayan practices at 1500 E Medical Center Dr, Ann Arbor, MI 48109. Dr. Yessayan's primary practice is University Hospital in Ann Arbor, Michigan. Dmand AI also links Dr. Yessayan to 1 dialysis center.
What is Dr. Lenar Tatios Yessayan's office phone number?
The practice phone on file for Dr. Yessayan is (734) 936-4000.
What is Dr. Lenar Tatios Yessayan's medical license number?
Dr. Yessayan holds Michigan license 4301082653.
Which hospitals is Dr. Lenar Tatios Yessayan affiliated with?
Dr. Yessayan is affiliated with University Hospital.
What medical group is Dr. Lenar Tatios Yessayan part of?
Dr. Yessayan is linked to University of Michigan Health.
Does Dr. Lenar Tatios Yessayan accept Medicare?
Yes. CMS data shows Dr. Yessayan billed Medicare for 286 services in 2024, and Dr. Yessayan accepts Medicare assignment.
How many Medicare patients does Dr. Lenar Tatios Yessayan see?
CMS counts 66 Medicare patients who saw Dr. Yessayan in 2024, with an average age of 64.
Is Dr. Lenar Tatios Yessayan board certified?
Yes. Dr. Yessayan is board certified in nephrology by the American Board of Internal Medicine.
Show 6 more questionsShow fewer questions
What services does Dr. Lenar Tatios Yessayan bill to Medicare?
In 2024, Dr. Yessayan's most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99232) and dialysis (90960).
What drugs does Dr. Lenar Tatios Yessayan prescribe most?
In 2024 Medicare Part D data, Dr. Yessayan's most prescribed drugs by claims were Velphoro.
Has Dr. Lenar Tatios Yessayan received payments from drug or device companies?
CMS Open Payments shows $40,673 in general payments to Dr. Yessayan from 8 companies from 2016 to 2025. The largest total came from Vantive US Healthcare LLC.
How long has Dr. Lenar Tatios Yessayan been practicing?
Dr. Yessayan graduated from medical school in 2001, 25 years ago.
Does Dr. Lenar Tatios Yessayan do research?
Dmand AI links 52 publications to Dr. Yessayan, published from 2016 to 2025.
Who does Dr. Lenar Tatios Yessayan publish with?
Dr. Yessayan's most frequent co-authors are Michael Heung, MD (15 shared papers), Harvey David Humes, MD (12 shared papers) and Stuart L. Goldstein, MD (5 shared papers).
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