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

Dr. Rachael A Mergenmeier, DO

Individual provider Family Medicine Physician · NPI 1518957265

Dr. Rachael A Mergenmeier, DO is a Family Practice in Saint Peters, Missouri. Qualified in 1998, 28 years ago. Practices with Mercy Clinic East Communities, a 573-clinician group and accepts Medicare assignment. Licensed in Missouri and Ohio.

Years since qualifying
28
Licensed in
MO, OH
In the registry since
2005
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Practice location Address checks out

107 Piper Hill Dr
Saint Peters, MO 63376-1651
Phone: (636) 939-3648
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 2008011538 (MO)
Family Medicine Physician Taxonomy 207Q00000X · Licence 34007396 (OH)

Record details

NPI number1518957265
Entity typeIndividual (Type 1)
GenderFemale
Credentials DO
Sole proprietorNo
NPI enumeratedOctober 25, 2005
Last updated in NPPESAugust 11, 2025
Certification dateAugust 11, 2025

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolOTHER
Graduated 1998 (28 years in practice)
Group practice Mercy Clinic East Communities — 573 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Other providers in Saint Peters