Dr. Rafael A. Guillen, MD
- Medicare services, 2024
- 123
- Medicare patients, 2024
- 66
- Part D claims, 2024
- 16,441
- Hospital affiliations
- 1
- Industry payments
- $5,492
- 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
Find Dr. Guillen's professional email, personal email and mobile number
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Dr. Rafael A. Guillen is an internist in New York, New York
Dr. Guillen practices at The Mount Sinai Hospital in New York, New York, part of Mount Sinai Health System.
Dr. Guillen's NPI, 1861430076, was assigned on June 2, 2006. Dr. Guillen graduated from Eugenio Maria de Hostos University in 1987. Dr. Guillen holds New York license 233234.
- NPI
- 1861430076NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6901851807
- NPI enumeration date
- June 2, 2006
- 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
- 65
- Medical school graduation
- 1987
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Rafael A. Guillen practices at 2 locations in New York, New York
Dr. Guillen'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. Guillen 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. Rafael A. Guillen is affiliated with 2 sites of care and 1 medical group
Dr. Guillen'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 Doctors Long Island. Dmand AI also links Dr. Guillen to 1 more physician office, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Rafael A. Guillen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Guillen practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| The Mount Sinai Hospital | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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. Rafael A. Guillen is one of 9,643 internists in New York
Internal medicine is Dr. Guillen's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Guillen is licensed in New York.
Specialties and state licenses
- Internal medicine, New YorkPrimary
Internists near Dr. Guillen
Counts of internists 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. Rafael A. Guillen billed Medicare for 123 services in 2024
CMS data shows 123 Medicare services from Dr. Guillen across 3 procedure codes in 2024, for 66 Medicare patients. Medicare paid $8,962 for them. Every service was in an office.
Dr. Guillen's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1002024: 7525%
- Other services
- 2023: 482024: 2646%
- Tests and treatments
- 2023: 162024: 2238%
Dr. Guillen compared with the New York median for internists, 2024
- Dr. Guillen
- New York median
- Medicare services
- 123vs 42671% below
- Medicare patients
- 66vs 15858% below
- Part D claims
- 15,564vs 62225.0 times
Medians across 9,428 internists in New York with Dmand AI profiles that report each measure.
Dr. Guillen'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. Guillen and other internists in New York.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Rafael A. Guillen treated 66 Medicare patients in 2024, average age 74
CMS counts 66 Medicare patients who saw Dr. Guillen in 2024. The largest group is 65 to 74, with 32 patients. 75% of them have high cholesterol, and 73% have high blood pressure. 56% are also on Medicaid. Their average risk score is 1.43, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Guillen's median patient age at 63, with 55% women.
Dr. Guillen's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Guillen's Medicare patients by sex, 2024
- Women4162%
- Men2538%
Chronic conditions among Dr. Guillen's Medicare patients, 2024
- High cholesterol75%
- High blood pressure73%
- Diabetes44%
- Ischemic heart disease27%
- Arthritis24%
- Chronic kidney disease20%
- Cancer18%
Share of Medicare patients with each condition. A patient can have several.
Dr. Guillen'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
- Women55%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Rafael A. Guillen wrote 16,441 Medicare Part D claims in 2024
In 2024, Dr. Guillen wrote 16,441 Medicare Part D claims for 893 patients. 84% of them were for generic drugs. CMS names the drug for 15,564 of them, across 167 drugs with 11 or more claims each, at $1,840,911 in total drug cost. In 2023, CMS named 14,662 claims across 167 drugs.
Dr. Guillen's Part D claims by kind of drug, 2024
- Generic13,800 claims84%
- Brand-name2,395 claims15%
- Other246 claims1%
Dr. Guillen'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. Guillen's Part D claims, 2024
- Antibiotics1%172 of 16,441 claims
- Antipsychotics, patients 65 and over0%71 of 16,441 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: 14,6622024: 15,5646%
Drugs named by CMS: 167 in 2024, 167 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
How Dr. Rafael A. Guillen takes part in Medicare
Dr. Guillen 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. Rafael A. Guillen received $5,492 in industry payments from 2016 to 2025
CMS Open Payments shows 242 general payments to Dr. Guillen from 31 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. Abbvie Inc. paid the most, $947.
General payments to Dr. Guillen by program year, 2016 to 2025
General payments to Dr. Guillen by kind, 2016 to 2025
- Food and beverage$5,46399%
- Education$291%
Companies that paid Dr. Guillen 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. Rafael A. Guillen graduated from Eugenio Maria de Hostos University
Dr. Guillen graduated from Eugenio Maria de Hostos University in 1987.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Rafael A. Guillen'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. Rafael A. Guillen
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. Rafael A. Guillen's NPI number?
Dr. Rafael A. Guillen's NPI number is 1861430076. It was assigned on June 2, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Rafael A. Guillen?
Dr. Rafael A. Guillen is an internist in New York, New York. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Rafael A. Guillen practice?
Dr. Guillen practices at One Gustave L Levy Place, New York, NY 10029. Dr. Guillen also practices at 1 Gustave L Levy Pl, New York, NY 10029. Dr. Guillen's primary practice is The Mount Sinai Hospital in New York, New York, part of Mount Sinai Health System. Dmand AI also links Dr. Guillen to 1 physician office.
What is Dr. Rafael A. Guillen's office phone number?
The practice phone on file for Dr. Guillen is (212) 241-7981.
What is Dr. Rafael A. Guillen's medical license number?
Dr. Guillen holds New York license 233234.
Which hospitals is Dr. Rafael A. Guillen affiliated with?
Dr. Guillen practices at The Mount Sinai Hospital in New York, New York.
What medical group is Dr. Rafael A. Guillen part of?
Dr. Guillen is linked to Mount Sinai Doctors Long Island.
Does Dr. Rafael A. Guillen accept Medicare?
Yes. CMS data shows Dr. Guillen billed Medicare for 123 services in 2024, and Dr. Guillen accepts Medicare assignment.
How many Medicare patients does Dr. Rafael A. Guillen see?
CMS counts 66 Medicare patients who saw Dr. Guillen in 2024, with an average age of 74.
What services does Dr. Rafael A. Guillen bill to Medicare?
In 2024, Dr. Guillen's most billed Medicare services were office visit, established patient (99214), medicare service (G0439) and heart test or procedure (93010).
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Where did Dr. Rafael A. Guillen go to medical school?
Dr. Guillen graduated from Eugenio Maria de Hostos University in 1987.
What drugs does Dr. Rafael A. Guillen prescribe most?
In 2024 Medicare Part D data, Dr. Guillen's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Alendronate Sodium.
Has Dr. Rafael A. Guillen received payments from drug or device companies?
CMS Open Payments shows $5,492 in general payments to Dr. Guillen from 31 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Rafael A. Guillen been practicing?
Dr. Guillen graduated from medical school in 1987, 39 years ago.
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