Mark J. Ratain
- Medicare services, 2024
- 90
- Medicare patients, 2024
- 90
- Hospital affiliations
- 1
- Industry payments
- $62,079
- Medical groups
- 2
- Practice address
- 5841 S Maryland Ave, Chicago, IL 60637
- Practice phone
- Call (773) 702-1530
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
The University of Chicago Medical Center
Chicago, Illinois
Find Mark Ratain's 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.
Mark J. Ratain is a hematologist and oncologist in Chicago, Illinois
Mark Ratain practices at The University of Chicago Medical Center in Chicago, Illinois.
Mark Ratain's NPI, 1255494779, was assigned on December 18, 2006. Mark Ratain graduated from Yale University School of Medicine in 1980. Mark Ratain holds Illinois license 036066554.
- NPI
- 1255494779NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5597708255
- NPI enumeration date
- December 18, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (773) 702-1530
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 72
- Medical school graduation
- 1980
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Mark J. Ratain practices at The University of Chicago Medical Center in Chicago, Illinois
Mark Ratain's primary practice is The University of Chicago Medical Center, at 5841 S Maryland Ave, Chicago, IL 60637 in Cook County. The practice phone is (773) 702-1530.
- The University of Chicago Medical Center5841 S Maryland Ave, Chicago, IL 60637 · Cook CountyPhone(773) 702-1530
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Mark J. Ratain is affiliated with 2 sites of care and 2 medical groups
Mark Ratain's primary practice is The University of Chicago Medical Center in Chicago, Illinois. Mark Ratain is also affiliated with University of Chicago Medical Center. The medical group on file is UChicago Medicine Physicians. Dmand AI also links Mark Ratain 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 Mark J. Ratain's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Mark Ratain practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| The University of Chicago 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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Mark J. Ratain is one of 563 hematologists and oncologists in Illinois
Hematology and oncology is Mark Ratain's primary specialty in the NPI Registry, under taxonomy code 207RH0003X. Mark Ratain is licensed in Illinois.
Specialties and state licenses
- Hematology and oncology, IllinoisPrimary
Hematologists and oncologists near Mark Ratain
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
Mark J. Ratain billed Medicare for 90 services in 2024
CMS data shows 90 Medicare services from Mark Ratain across 3 procedure codes in 2024, for 90 Medicare patients. Medicare paid $10,301 for them. Every service was in a facility, such as a hospital, rather than an office.
Mark Ratain's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 312024: 90190%
Mark Ratain compared with the Illinois median for hematologists and oncologists, 2024
- Mark Ratain
- Illinois median
- Medicare services
- 90vs 1,05691% below
- Medicare patients
- 90vs 28268% below
Medians across 547 hematologists and oncologists in Illinois with Dmand AI profiles that report each measure.
Mark Ratain'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 Mark Ratain?
Medicare shows one payer. Book a meeting to get commercial claims data for Mark Ratain and other hematologists and oncologists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Mark J. Ratain treated 90 Medicare patients in 2024, average age 69
CMS counts 90 Medicare patients who saw Mark Ratain in 2024. The largest group is 65 to 74, with 37 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 34% are also on Medicaid. Their average risk score is 3.76, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Mark Ratain's median patient age at 70, with 40% women.
Mark Ratain's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Mark Ratain's Medicare patients by sex, 2024
- Women4348%
- Men4752%
Chronic conditions among Mark Ratain's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis63%
- Heart failure47%
- Chronic kidney disease46%
- Mood disorders44%
- Ischemic heart disease43%
- COPD41%
Share of Medicare patients with each condition. A patient can have several.
Mark Ratain's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 70
Patient panel by sex, all payers
- Women40%
- Men60%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Mark J. Ratain offers telehealth to Medicare patients
Mark Ratain accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Mark Ratain as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Mark J. Ratain received $62,079 in industry payments from 2016 to 2024
CMS Open Payments shows 26 general payments to Mark Ratain from 8 drug and device companies from 2016 to 2024. Consulting fees make up the largest share, 88% of the total. Shionogi Inc paid the most, $31,199.
General payments to Mark Ratain by program year, 2016 to 2024
General payments to Mark Ratain by kind, 2016 to 2024
- Consulting fees$54,37588%
- Travel and lodging$7,36812%
- Food and beverage$3361%
Companies that paid Mark Ratain the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Mark J. Ratain graduated from Yale University School of Medicine
Mark Ratain graduated from Yale University School of Medicine in 1980.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Mark J. Ratain'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) |
| 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 Mark J. Ratain
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Mark J. Ratain's NPI number?
Mark J. Ratain's NPI number is 1255494779. It was assigned on December 18, 2006, and it is active in the NPI Registry.
What does Mark J. Ratain specialize in?
Mark J. Ratain is a hematologist and oncologist in Chicago, Illinois. The primary specialty in the NPI Registry is Hematology & Oncology Physician (taxonomy code 207RH0003X).
Where does Mark J. Ratain practice?
Mark Ratain practices at 5841 S Maryland Ave, Chicago, IL 60637. Mark Ratain's primary practice is The University of Chicago Medical Center in Chicago, Illinois. Dmand AI also links Mark Ratain to 1 medical group.
What is Mark J. Ratain's office phone number?
The practice phone on file for Mark Ratain is (773) 702-1530.
What is Mark J. Ratain's medical license number?
Mark Ratain holds Illinois license 036066554.
Which hospitals is Mark J. Ratain affiliated with?
Mark Ratain is affiliated with University of Chicago Medical Center.
What medical group is Mark J. Ratain part of?
Mark Ratain is linked to UChicago Medicine Physicians. Dmand AI links Mark Ratain to 1 more medical group.
Does Mark J. Ratain accept Medicare?
Yes. CMS data shows Mark Ratain billed Medicare for 90 services in 2024, and Mark Ratain accepts Medicare assignment.
Does Mark J. Ratain offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Mark Ratain as offering telehealth services.
How many Medicare patients does Mark J. Ratain see?
CMS counts 90 Medicare patients who saw Mark Ratain in 2024, with an average age of 69.
Show 4 more questionsShow fewer questions
What services does Mark J. Ratain bill to Medicare?
In 2024, Mark Ratain's most billed Medicare services were hospital inpatient care (99222), hospital inpatient care (99223) and office visit, new patient (99204).
Where did Mark J. Ratain go to medical school?
Mark Ratain graduated from Yale University School of Medicine in 1980.
Has Mark J. Ratain received payments from drug or device companies?
CMS Open Payments shows $62,079 in general payments to Mark Ratain from 8 companies from 2016 to 2024. The largest total came from Shionogi Inc.
How long has Mark J. Ratain been practicing?
Mark Ratain graduated from medical school in 1980, 46 years ago.
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