Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Gregory Peter Cejas, MD

Individual provider Psychiatry Physician · NPI 1225558802

Dr. Gregory Peter Cejas, MD is a Psychiatry in Saint Louis, Missouri. Qualified in 2017, 9 years ago. Practices with Washington University, a 2,986-clinician group and accepts Medicare assignment. Licensed in Missouri.

Years since qualifying
9
Licensed in
MO
In the registry since
2017
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

4444 Forest Park Ave Ste 2600
Saint Louis, MO 63108-2212
Phone: (314) 286-1700
Fax: (314) 286-1730
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence 2019022607 (MO)

Record details

NPI number1225558802
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 23, 2017
Last updated in NPPESApril 15, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPSYCHIATRY
Medical schoolOTHER
Graduated 2017 (9 years in practice)
Group practice Washington University — 2986 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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