Dr. Jonathan D. Kloss, MD
- Medicare services, 2022
- 4,378
- Medicare patients, 2024
- 15
- Part D claims, 2024
- 45
- MIPS score, 2024
- 87
- Hospital affiliations
- 1
- Practice address
- 100 Woods Rd, Valhalla, NY 10595
- Practice phone
- Call (914) 493-2961
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Westchester Medical Center
Valhalla, New York
Find Dr. Kloss' 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. Jonathan D. Kloss is a hematologist and oncologist in Valhalla, New York
Dr. Kloss practices at Westchester Medical Center in Valhalla, New York.
Dr. Kloss' NPI, 1134118565, was assigned on October 18, 2005. Dr. Kloss graduated from Universidad del Noreste in 1985. Dr. Kloss holds New York license 1731201.
- NPI
- 1134118565NPI Registry (opens in a new tab)
- NPI enumeration date
- October 18, 2005
- NPI status
- Active
- Practice phone
- (914) 493-2961
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 67
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Jonathan D. Kloss practices at Westchester Medical Center in Valhalla, New York
Dr. Kloss' primary practice is Westchester Medical Center, at 100 Woods Rd, Valhalla, NY 10595 in Westchester County. The practice phone is (914) 493-2961.
- Westchester Medical Center100 Woods Rd, Valhalla, NY 10595 · Westchester CountyPhone(914) 493-2961
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Jonathan D. Kloss is affiliated with 2 sites of care and 2 medical groups
Dr. Kloss' primary practice is Westchester Medical Center in Valhalla, New York. Dr. Kloss is also affiliated with Guthrie Lourdes Hospital. The medical group on file is Guthrie Medical Group. Dmand AI also links Dr. Kloss to 1 more medical group, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Jonathan D. Kloss' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Kloss practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Westchester Medical Center | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Jonathan D. Kloss is one of 996 hematologists and oncologists in New York
Hematology and oncology is Dr. Kloss' primary specialty in the NPI Registry, under taxonomy code 207RH0003X. Dr. Kloss is licensed in New York.
Specialties and state licenses
- Hematology and oncology, New YorkPrimary
Hematologists and oncologists near Dr. Kloss
Counts of hematologists and oncologists 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. Jonathan D. Kloss billed Medicare for 4,378 services in 2022
CMS data shows 4,378 Medicare services from Dr. Kloss across 18 procedure codes in 2022, for 15 Medicare patients. Medicare paid $97,885 for them. Every service was in an office.
Dr. Kloss' Medicare services by type, 2021 to 2022
- 2021
- 2022
- Drugs given in the office
- 2021: 55,1612022: 2,19896%
- Lab and pathology
- 2021: 2,5932022: 75671%
- Tests and treatments
- 2021: 1,7942022: 53770%
- Office and hospital visits
- 2021: 1,5752022: 45271%
- Surgery
- 2021: 1,5102022: 43571%
Dr. Kloss compared with the New York median for hematologists and oncologists, 2022
- Dr. Kloss
- New York median
- Medicare services
- 4,378vs 6686.6 times
- Medicare patients
- 15vs 21093% below
- Part D claims
- 98vs 25862% below
Medians across 940 hematologists and oncologists in New York with Dmand AI profiles that report each measure.
Dr. Kloss' most billed Medicare procedure codes, 2022
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. Kloss?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Kloss and other hematologists and oncologists in New York.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Jonathan D. Kloss treated 15 Medicare patients in 2024, average age 76
CMS counts 15 Medicare patients who saw Dr. Kloss in 2024. The largest group is under 65, with 0 patients. 75% of them have high cholesterol, and 73% have high blood pressure. Their average risk score is 1.51, 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. Kloss' median patient age at 79, with 41% women.
Dr. Kloss' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among Dr. Kloss' Medicare patients, 2024
- High cholesterol75%
- High blood pressure73%
Share of Medicare patients with each condition. A patient can have several.
Dr. Kloss' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 79
Patient panel by sex, all payers
- Women41%
- Men59%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Jonathan D. Kloss wrote 45 Medicare Part D claims in 2024
In 2024, Dr. Kloss wrote 45 Medicare Part D claims for 13 patients. 51% of them were for generic drugs. They cover 5 drugs, with $689,164 in total drug cost. In 2021, CMS named 378 claims across 18 drugs.
Dr. Kloss' Part D claims by kind of drug, 2024
- Generic23 claims51%
- Brand-name22 claims49%
Dr. Kloss' most prescribed drugs by claims, 2022
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, 2021 to 2022
- 2021
- 2022
- Claims for drugs CMS names
- 2021: 3782022: 9874%
Drugs named by CMS: 5 in 2022, 18 in 2021.
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. Jonathan D. Kloss scored 87 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 87 out of 100 for Dr. Kloss for performance year 2024, reported as part of a group.
Dr. Kloss' MIPS scores, performance year 2024
- 87of 100Final score
- 77.6of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 76of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Source: Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Jonathan D. Kloss received $10,914 in industry payments from 2016 to 2024
CMS Open Payments shows 672 general payments to Dr. Kloss from 58 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 95% of the total. Janssen Pharmaceuticals, Inc paid the most, $1,483.
General payments to Dr. Kloss by program year, 2016 to 2024
General payments to Dr. Kloss by kind, 2016 to 2024
- Food and beverage$10,32295%
- Education$4784%
- Consulting fees$1141%
Companies that paid Dr. Kloss 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. Jonathan D. Kloss graduated from Universidad del Noreste
Dr. Kloss graduated from Universidad del Noreste in 1985.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Jonathan D. Kloss'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 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 | Clinician Public Reporting: Overall MIPS Performance (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. Jonathan D. Kloss
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. Jonathan D. Kloss' NPI number?
Dr. Jonathan D. Kloss' NPI number is 1134118565. It was assigned on October 18, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Jonathan D. Kloss?
Dr. Jonathan D. Kloss is a hematologist and oncologist in Valhalla, New York. The primary specialty in the NPI Registry is Hematology & Oncology Physician (taxonomy code 207RH0003X).
Where does Dr. Jonathan D. Kloss practice?
Dr. Kloss practices at 100 Woods Rd, Valhalla, NY 10595. Dr. Kloss' primary practice is Westchester Medical Center in Valhalla, New York. Dmand AI also links Dr. Kloss to 1 medical group.
What is Dr. Jonathan D. Kloss' office phone number?
The practice phone on file for Dr. Kloss is (914) 493-2961.
What is Dr. Jonathan D. Kloss' medical license number?
Dr. Kloss holds New York license 1731201.
Which hospitals is Dr. Jonathan D. Kloss affiliated with?
Dr. Kloss is affiliated with Guthrie Lourdes Hospital.
What medical group is Dr. Jonathan D. Kloss part of?
Dr. Kloss is linked to Guthrie Medical Group. Dmand AI links Dr. Kloss to 1 more medical group.
Does Dr. Jonathan D. Kloss accept Medicare?
Yes. CMS data shows Dr. Kloss billed Medicare for 4,378 services in 2022.
What is Dr. Jonathan D. Kloss' MIPS score?
Dr. Kloss' MIPS final score for performance year 2024 is 87 out of 100, reported as part of a group.
How many Medicare patients does Dr. Jonathan D. Kloss see?
CMS counts 15 Medicare patients who saw Dr. Kloss in 2024, with an average age of 76.
Show 5 more questionsShow fewer questions
What services does Dr. Jonathan D. Kloss bill to Medicare?
In 2022, Dr. Kloss' most billed Medicare services were injected or infused drug (J1100), injected or infused drug (J2469) and surgery: heart and blood vessels (36415).
Where did Dr. Jonathan D. Kloss go to medical school?
Dr. Kloss graduated from Universidad del Noreste in 1985.
What drugs does Dr. Jonathan D. Kloss prescribe most?
In 2022 Medicare Part D data, Dr. Kloss' most prescribed drugs by claims were Anastrozole, Imbruvica and Lenvima.
Has Dr. Jonathan D. Kloss received payments from drug or device companies?
CMS Open Payments shows $10,914 in general payments to Dr. Kloss from 58 companies from 2016 to 2024. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. Jonathan D. Kloss been practicing?
Dr. Kloss graduated from medical school in 1985, 41 years ago.
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