Mary B. Ernst, FNP
Nurse Practitioner · Saint Peters, MO
Mary B. Ernst, FNP is a nurse practitioner with a practice address in Saint Peters, Missouri, and NPI 1487694659, issued on Jun 7, 2006. Check the license (Missouri 2014010124, as entered in NPPES) with the Missouri board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mary B. Ernst
- Credential
- FNP
- Primary taxonomy
- Nurse Practitioner 363L00000X
- License numbers
- 2014010124 MO
073032 MO
Self-reported in NPPES; status is on the state search - Practice location
- 107 Piper Hill Dr, Saint Peters, MO 63376
- Phone
- (636) 477-8757
- Enumerated
- Jun 7, 2006
- Record last updated
- May 3, 2022
- Fax
- (314) 219-6241
- Medicare enrollment
- Enrolled (PECOS I20040217001161); accepts Medicare assignment
- Entity
- Type 1 · individual
Also registered at 107 Piper Hill Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Robert Bradshaw, M.D.Pediatrics Physician1558335638
- Latasha Cunningham, NPFamily Nurse Practitioner1710118161
- Lisa Eloff, RN, CPNPPediatric Nurse Practitioner1366688327
- Ramesh Khurana, MDFamily Medicine Physician1922038736
- Edward Kunst, MDInternal Medicine Physician1467428672
- Behrad Majidi, M.D.Internal Medicine Physician1295765386
Verify Mary B. Ernst in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Missouri board licenses this profession
Search for license 2014010124Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
70% fewer Medicare Part D claims than the average nurse practitioner in 2024
331 Medicare Part D claims for 218 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D.
Most prescribed
- Prednisone110 claims
- Cefdinir37 claims
- Nitrofurantoin Mono-Macro28 claims
- Cephalexin27 claims
- Azithromycin22 claims
- Doxycycline Hyclate19 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Physician Groups LCSaint Louis, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
32 nurse practitioner records list a practice address in Saint Peters
They are 32 of the 1,259 NPPES records with a practice address in Saint Peters, and 1,720 nurse practitioner records in Missouri.
All 32 in Saint Peters → All 1,720 in Missouri → Every provider in Saint Peters →
Other nurse practitioner records in Missouri
- Caitlin Aaron, NP-CLees Summit, MO1649934340
- Sarah Abaricia, FNPSaint Peters, MO1447709365
- Maureen Abongo, DNPSaint Louis, MO1225819048
- Hawo AbukarBlue Springs, MO1841135084
- Morgan Ackerman, NPChesterfield, MO1811625676
- Yolanda Acklin, NPFlorissant, MO1881790996
- Alina Adams, NPRichmond Heights, MO1003393513
- Dorothy Adams, NPHolden, MO1043274210
- Holly Adams, MSN, FNP-BCDoniphan, MO1841899614
- Lindsey Adams, NP-CFenton, MO1326611757
Common questions
What is Mary B. Ernst, FNP's NPI number?
Mary B. Ernst, FNP's National Provider Identifier (NPI) is 1487694659, issued on Jun 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mary B. Ernst, FNP located?
The NPPES record lists a practice address at 107 Piper Hill Dr, Saint Peters, MO, 63376. Phone: (636) 477-8757. Providers update this record themselves, so call before visiting.
How can I verify Mary B. Ernst, FNP's license?
NPPES lists Missouri license number 2014010124, as entered by the provider. Search the Missouri board that licenses this profession; the NPPES record confirms identity only.
How much does Mary B. Ernst, FNP prescribe under Medicare Part D?
In 2024, Mary B. Ernst, FNP had 331 Medicare Part D claims for 218 beneficiaries; the average among nurse practitioner prescribers was 1,109. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.