Dr. Rex Robert Hermansen, MD
- Medicare services, 2024
- 774
- Medicare patients, 2024
- 210
- Part D claims, 2024
- 48
- Hospital affiliations
- 1
- Medical group
- 1
- Practice address
- One Gustave L Levy Place, New York, NY 10029
- Practice phone
- Call (212) 241-7981
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Rex Robert Hermansen is a hospitalist in New York, New York
Dr. Hermansen practices at The Mount Sinai Hospital in New York, New York, part of Mount Sinai Health System.
Dr. Hermansen's NPI, 1639532039, was assigned on April 1, 2016. Dr. Hermansen graduated from The University of Texas Health Science Center at San Antonio in 2016. Dr. Hermansen holds New York license 296964.
- NPI
- 1639532039NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9638412703
- NPI enumeration date
- April 1, 2016
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (212) 241-7981
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 36
- Medical school graduation
- 2016
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Rex Robert Hermansen practices at 2 locations in New York, New York
Dr. Hermansen's primary practice is The Mount Sinai Hospital, at One Gustave L Levy Place, New York, NY 10029 in New York County. The practice phone is (212) 241-7981. Dr. Hermansen also practices at The Mount Sinai Hospital, 1 Gustave L Levy Pl, New York, NY 10029.
- The Mount Sinai HospitalPrimaryOne Gustave L Levy Place, New York, NY 10029 · New York CountyPhone(212) 241-7981
- The Mount Sinai Hospital1 Gustave L Levy Pl, New York, NY 10029 · New York CountyPhone(212) 256-2904
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Dr. Rex Robert Hermansen is affiliated with 1 site of care and 1 medical group
Dr. Hermansen's primary practice is The Mount Sinai Hospital in New York, New York, part of Mount Sinai Health System. The medical group on file is Mount Sinai Institute for Liver Medicine.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Rex Robert Hermansen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hermansen practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| The Mount Sinai Hospital | Available with a free account |
Source: Dmand AI Technology Install Data
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Dmand AI maps EHR vendors, IT decision makers and buying committees across Mount Sinai Health System and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Rex Robert Hermansen is one of 1,796 hospitalists in New York
Hospitalist is Dr. Hermansen's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dr. Hermansen is licensed in New York.
Specialties and state licenses
- Hospitalist, New YorkPrimary
Hospitalists near Dr. Hermansen
Counts of hospitalists 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. Rex Robert Hermansen billed Medicare for 774 services in 2024
CMS data shows 774 Medicare services from Dr. Hermansen across 4 procedure codes in 2024, for 210 Medicare patients. Medicare paid $70,934 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Hermansen's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 8312024: 7747%
Dr. Hermansen compared with the New York median for hospitalists, 2024
- Dr. Hermansen
- New York median
- Medicare services
- 774vs 38899% above
- Medicare patients
- 210vs 16329% above
- Part D claims
- 11vs 5580% below
Medians across 1,696 hospitalists in New York with Dmand AI profiles that report each measure.
Dr. Hermansen'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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Rex Robert Hermansen treated 210 Medicare patients in 2024, average age 74
CMS counts 210 Medicare patients who saw Dr. Hermansen in 2024. The largest group is 65 to 74, with 72 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 52% are also on Medicaid. Their average risk score is 4.09, 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. Hermansen's median patient age at 64, with 52% women.
Dr. Hermansen's Medicare patients by age, 2024
Dr. Hermansen's Medicare patients by sex, 2024
- Women10550%
- Men10550%
Chronic conditions among Dr. Hermansen's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes58%
- Heart failure55%
- Arthritis52%
- Chronic kidney disease52%
- Ischemic heart disease50%
- Mood disorders50%
Share of Medicare patients with each condition. A patient can have several.
Dr. Hermansen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 64
Patient panel by sex, all payers
- Women52%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Rex Robert Hermansen wrote 48 Medicare Part D claims in 2024
In 2024, Dr. Hermansen wrote 48 Medicare Part D claims for 12 patients. 69% of them were for generic drugs. CMS names the drug for 11 of them, across 1 drug with 11 or more claims each, at $3,129 in total drug cost. In 2020, CMS named 15 claims across 1 drug.
Dr. Hermansen's Part D claims by kind of drug, 2024
- Generic33 claims69%
- Brand-name15 claims31%
Dr. Hermansen's most prescribed drugs by claims, 2021
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, 2020 to 2021
- 2020
- 2021
- Claims for drugs CMS names
- 2020: 152021: 1127%
Drugs named by CMS: 1 in 2021, 1 in 2020.
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. Rex Robert Hermansen takes part in Medicare
Dr. Hermansen 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. Rex Robert Hermansen graduated from The University of Texas Health Science Center at San Antonio
Dr. Hermansen graduated from The University of Texas Health Science Center at San Antonio in 2016.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Rex Robert Hermansen'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) |
| 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. Rex Robert Hermansen
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. Rex Robert Hermansen's NPI number?
Dr. Rex Robert Hermansen's NPI number is 1639532039. It was assigned on April 1, 2016, and it is active in the NPI Registry.
What kind of doctor is Dr. Rex Robert Hermansen?
Dr. Rex Robert Hermansen is a hospitalist in New York, New York. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Dr. Rex Robert Hermansen practice?
Dr. Hermansen practices at One Gustave L Levy Place, New York, NY 10029. Dr. Hermansen also practices at 1 Gustave L Levy Pl, New York, NY 10029. Dr. Hermansen's primary practice is The Mount Sinai Hospital in New York, New York, part of Mount Sinai Health System.
What is Dr. Rex Robert Hermansen's office phone number?
The practice phone on file for Dr. Hermansen is (212) 241-7981.
What is Dr. Rex Robert Hermansen's medical license number?
Dr. Hermansen holds New York license 296964.
Which hospitals is Dr. Rex Robert Hermansen affiliated with?
Dr. Hermansen practices at The Mount Sinai Hospital in New York, New York.
What medical group is Dr. Rex Robert Hermansen part of?
Dr. Hermansen is linked to Mount Sinai Institute for Liver Medicine.
Does Dr. Rex Robert Hermansen accept Medicare?
Yes. CMS data shows Dr. Hermansen billed Medicare for 774 services in 2024, and Dr. Hermansen accepts Medicare assignment.
How many Medicare patients does Dr. Rex Robert Hermansen see?
CMS counts 210 Medicare patients who saw Dr. Hermansen in 2024, with an average age of 74.
What services does Dr. Rex Robert Hermansen bill to Medicare?
In 2024, Dr. Hermansen's most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99232) and hospital inpatient care (99239).
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Where did Dr. Rex Robert Hermansen go to medical school?
Dr. Hermansen graduated from The University of Texas Health Science Center at San Antonio in 2016.
What drugs does Dr. Rex Robert Hermansen prescribe most?
In 2021 Medicare Part D data, Dr. Hermansen's most prescribed drugs by claims were Ampicillin Sodium.
How long has Dr. Rex Robert Hermansen been practicing?
Dr. Hermansen graduated from medical school in 2016, 10 years ago.
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