Antipsychotic AgentsAutism Spectrum DisorderBody Mass Index
Dr. Gregory Peter Cejas, MD
NPI1225558802
- Part D claims, 2024
- 15
- Publications
- 1
- Affiliated sites
- 2
- Medical group
- 1
- State license
- 1
- Practice address
- 4444 Forest Park Ave, Saint Louis, MO 63108
- Practice phone
- Call (314) 445-7757
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Washington University School of Medicine
Saint Louis, Missouri
Find Dr. Cejas' 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. Gregory Peter Cejas is a psychiatrist in Saint Louis, Missouri
Dr. Cejas practices at Washington University School of Medicine in Saint Louis, Missouri.
Dr. Cejas' NPI, 1225558802, was assigned on June 23, 2017. Dr. Cejas holds Missouri license 2019022607.
NPI and contact details
- NPI
- 1225558802NPI Registry (opens in a new tab)
- NPI enumeration date
- June 23, 2017
- NPI status
- Active
- Practice phone
- (314) 445-7757
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 35
- Medical school graduation
- 2017
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Gregory Peter Cejas practices at Washington University School of Medicine in Saint Louis, Missouri
Dr. Cejas' primary practice is Washington University School of Medicine, at 4444 Forest Park Ave, Saint Louis, MO 63108 in Saint Louis City. The practice phone is (314) 445-7757.
- Washington University School of Medicine4444 Forest Park Ave, Saint Louis, MO 63108 · Saint Louis CityPhone(314) 445-7757
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Gregory Peter Cejas is affiliated with 3 sites of care and 1 medical group
Dr. Cejas' primary practice is Washington University School of Medicine in Saint Louis, Missouri. The medical group on file is WashU Medicine Psychiatry. Dmand AI also links Dr. Cejas to 1 more group practice or clinic and 1 therapy and rehab clinic, each named with a free account. Dr. Cejas' employer is on file too: a physical therapy & rehab clinic.
Washington University School of MedicinePrimary
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Gregory Peter Cejas' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Cejas practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Washington University School of Medicine | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
See the EHR and IT leaders at every site where Dr. Cejas practices
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Gregory Peter Cejas is one of 679 psychiatrists in Missouri
Psychiatry is Dr. Cejas' primary specialty in the NPI Registry, under taxonomy code 2084P0800X. Dr. Cejas is licensed in Missouri.
Specialties and state licenses
- Psychiatry, MissouriPrimary
Psychiatrists near Dr. Cejas
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. Gregory Peter Cejas' patients have a median age of 10
Across all payers, Dmand AI patient panel data puts Dr. Cejas' median patient age at 10, with 36% women.
Dr. Cejas' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 10
Patient panel by sex, all payers
- Women36%
- Men64%
Source: Dmand AI Patient Panel Data
Dr. Gregory Peter Cejas wrote 15 Medicare Part D claims in 2024
In 2024, Dr. Cejas wrote 15 Medicare Part D claims. 100% of them were for generic drugs. CMS names the drug for 11 of them, across 1 drug with 11 or more claims each, at $35 in total drug cost. In 2023, CMS named 17 claims across 1 drug.
Part D claims, 202415
Drugs named by CMS1
Total drug cost$35
Dr. Cejas' 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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 172024: 1135%
Drugs named by CMS: 1 in 2024, 1 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
For MedTech and pharma teams
Find psychiatrists like Dr. Cejas by procedure volume and prescribing
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Gregory Peter Cejas has 1 publication on record
Dmand AI links 1 paper to Dr. Cejas in 2025.
Papers1
Recent publications by Dr. Cejas
See who Dr. Cejas researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Cejas 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. Gregory Peter Cejas'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 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. Gregory Peter Cejas
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. Gregory Peter Cejas' NPI number?
Dr. Gregory Peter Cejas' NPI number is 1225558802. It was assigned on June 23, 2017, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory Peter Cejas?
Dr. Gregory Peter Cejas is a psychiatrist in Saint Louis, Missouri. The primary specialty in the NPI Registry is Psychiatry Physician (taxonomy code 2084P0800X).
Where does Dr. Gregory Peter Cejas practice?
Dr. Cejas practices at 4444 Forest Park Ave, Saint Louis, MO 63108. Dr. Cejas' primary practice is Washington University School of Medicine in Saint Louis, Missouri. Dmand AI also links Dr. Cejas to 1 group practice or clinic and 1 therapy and rehab clinic.
What is Dr. Gregory Peter Cejas' office phone number?
The practice phone on file for Dr. Cejas is (314) 445-7757.
What is Dr. Gregory Peter Cejas' medical license number?
Dr. Cejas holds Missouri license 2019022607.
What medical group is Dr. Gregory Peter Cejas part of?
Dr. Cejas is linked to WashU Medicine Psychiatry.
What drugs does Dr. Gregory Peter Cejas prescribe most?
In 2024 Medicare Part D data, Dr. Cejas' most prescribed drugs by claims were Duloxetine HCl.
How long has Dr. Gregory Peter Cejas been practicing?
Dr. Cejas graduated from medical school in 2017, 9 years ago.
Does Dr. Gregory Peter Cejas do research?
Dmand AI links 1 publication to Dr. Cejas.
Selling to psychiatry practices?
See psychiatrists in Missouri by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card