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

Geraldine A. Ryan, MD

Individual provider Internal Medicine Physician · NPI 1689640609

Geraldine A. Ryan, MD is a Family Practice in O Fallon, Missouri. Graduated from Saint Louis University School of Medicine in 1988, 38 years ago. Practices with Mercy Clinic East Communities, a 573-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Missouri.

Years since qualifying
38
Trained at
Saint Louis University School of Medicine
Licensed in
MO
In the registry since
2006
Specialties on file
2
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

9426 Phoenix Village Pkwy
O Fallon, MO 63368-4781
Phone: (636) 561-5999
Fax: (636) 561-4746
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 100756 (MO)
Pediatrics Physician Taxonomy 208000000X · Licence 100756 (MO)

Record details

NPI number1689640609
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 28, 2006
Last updated in NPPESApril 2, 2015
Mailing address9426 Phoenix Village Pkwy, O Fallon, MO 63368-4781

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolSAINT LOUIS UNIVERSITY SCHOOL OF MEDICINE
Graduated 1988 (38 years in practice)
Group practice Mercy Clinic East Communities — 573 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations4 on file with Medicare

Other providers in O Fallon