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Dr. Robert Ratajczak, MD
NPI1851911747
- Part D claims, 2024
- 49
- Publications
- 1
- State license
- 1
- Year NPI issued
- 2020
- Practice address
- 5841 S Maryland Ave, Chicago, IL 60637
- Practice phone
- Call (773) 906-4546
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Ratajczak'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.
Dr. Robert Ratajczak is a psychiatrist in Chicago, Illinois
Dr. Ratajczak practices in Chicago, Illinois.
Dr. Ratajczak's NPI, 1851911747, was assigned on April 21, 2020. Dr. Ratajczak holds Illinois license 125.075645.
NPI and contact details
- NPI
- 1851911747NPI Registry (opens in a new tab)
- NPI enumeration date
- April 21, 2020
- NPI status
- Active
- Practice phone
- (773) 906-4546
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dr. Robert Ratajczak's practice address is in Chicago, Illinois
Dr. Ratajczak's practice address in the NPI Registry is 5841 S Maryland Ave, Chicago, IL 60637, in Cook County. The practice phone is (773) 906-4546.
- NPI Registry address5841 S Maryland Ave, Chicago, IL 60637 · Cook CountyPhone(773) 906-4546
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. Robert Ratajczak's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ratajczak practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dr. Ratajczak's practice | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Robert Ratajczak is one of 1,527 psychiatrists in Illinois
Psychiatry is Dr. Ratajczak's primary specialty in the NPI Registry, under taxonomy code 2084P0800X. Dr. Ratajczak is licensed in Illinois.
Specialties and state licenses
- Psychiatry, IllinoisPrimary
Psychiatrists near Dr. Ratajczak
Counts of psychiatrists 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. Robert Ratajczak's patients have a median age of 27
Across all payers, Dmand AI patient panel data puts Dr. Ratajczak's median patient age at 27, with 53% women.
Dr. Ratajczak's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 27
Patient panel by sex, all payers
- Women53%
- Men47%
Source: Dmand AI Patient Panel Data
Dr. Robert Ratajczak wrote 49 Medicare Part D claims in 2024
In 2024, Dr. Ratajczak wrote 49 Medicare Part D claims for 12 patients. 100% of them were for generic drugs. They cover 6 drugs, with $5,761 in total drug cost. In 2022, CMS named 208 claims across 11 drugs.
Part D claims, 202449
Drugs named by CMS6
Total drug cost$5,761
Part D patients12
Dr. Ratajczak's most prescribed drugs by claims, 2023
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, 2022 to 2023
- 2022
- 2023
- Claims for drugs CMS names
- 2022: 2082023: 18511%
Drugs named by CMS: 6 in 2023, 11 in 2022.
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
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Dr. Robert Ratajczak has 1 publication on record
Dmand AI links 1 paper to Dr. Ratajczak in 2023. Dr. Ratajczak's most frequent co-author is Richard Cockerill, MD.
Papers1
Dr. Ratajczak's most frequent co-authors
Recent publications by Dr. Ratajczak
See who Dr. Ratajczak researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Ratajczak works with, so you can find a warm path to the right psychiatrists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Sources for Dr. Robert Ratajczak'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 |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Robert Ratajczak
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. Robert Ratajczak's NPI number?
Dr. Robert Ratajczak's NPI number is 1851911747. It was assigned on April 21, 2020, and it is active in the NPI Registry.
What kind of doctor is Dr. Robert Ratajczak?
Dr. Robert Ratajczak is a psychiatrist in Chicago, Illinois. The primary specialty in the NPI Registry is Psychiatry Physician (taxonomy code 2084P0800X).
Where does Dr. Robert Ratajczak practice?
Dr. Ratajczak practices at 5841 S Maryland Ave, Chicago, IL 60637.
What is Dr. Robert Ratajczak's office phone number?
The practice phone on file for Dr. Ratajczak is (773) 906-4546.
What is Dr. Robert Ratajczak's medical license number?
Dr. Ratajczak holds Illinois license 125.075645.
What drugs does Dr. Robert Ratajczak prescribe most?
In 2023 Medicare Part D data, Dr. Ratajczak's most prescribed drugs by claims were Sertraline HCl, Duloxetine HCl and Trazodone HCl.
How long has Dr. Robert Ratajczak been practicing?
Dr. Ratajczak's NPI was assigned in 2020.
Does Dr. Robert Ratajczak do research?
Dmand AI links 1 publication to Dr. Ratajczak.
Who does Dr. Robert Ratajczak publish with?
Dr. Ratajczak's most frequent co-authors are Richard Cockerill, MD (1 shared paper).
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