William Frederick Feldner, D.O.
Family Medicine Physician · Saint Louis, MO
William Frederick Feldner, D.O. is a family medicine physician with a practice address in Saint Louis, Missouri, and NPI 1922085539, issued on Dec 23, 2005. Check the license (Missouri R1J82, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- William Frederick Feldner
- Credential
- D.O.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- R1J82 MO
Self-reported in NPPES; status is on the state search - Practice location
- 3009 North New Ballas Road Ste 226A, Saint Louis, MO 63195
- Phone
- (314) 996-4900
- Enumerated
- Dec 23, 2005
- Record last updated
- Sep 18, 2025
- Fax
- (314) 996-4901
- Medicaid IDs
- 205157811 MO
205157803 MO - Medicare enrollment
- Enrolled (PECOS I20100816000873); accepts Medicare assignment
- Medical or professional school
- Oklahoma State University College Of Osteopathic Medicine, 1987
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 2,991 in Missouri → Look up another NPI →
Verify William Frederick Feldner in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license R1J82Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
60% more Medicare Part D claims than the average family medicine physician in 2024
5,665 Medicare Part D claims for 400 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 150 claims were for opioids.
Most prescribed
- Atorvastatin Calcium593 claims
- Amlodipine Besylate251 claims
- Lisinopril239 claims
- Losartan Potassium199 claims
- Metoprolol Succinate165 claims
- Levothyroxine Sodium156 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.
Industry payments in 2024: $17.45
1 payment: food and beverage; the largest payer was Abbvie Inc. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
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).
William Frederick Feldner among 2,991 family medicine physician records in Missouri
William Frederick Feldner, D.O. is one of 2,991 family medicine physician records with a practice address in Missouri. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 87% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1987 · median 2006 among the 1,778 with a school on file
- Record last updated2025 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Family Medicine Physician providers in Missouri
There are 2,991 family medicine physician records in Missouri.
All 2,991 in Missouri → Every provider in Saint Louis → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Michael Howard, DOSaint Louis, MO 631441942381199
- Sripatt Kulkamthorn, M.D.Saint Louis, MO 631441306948930
- Susan Singer, MDSaint Louis, MO 631441952520306
- Ben Swink, D.O.Saint Louis, MO 631441104958719
- Linda Therkildsen, DOSaint Louis, MO 631441902909278
- Michael Bross, M.D.St Louis, MO 631431679590590
- Mirdhula Ananthamurugan, MDSaint Louis, MO 631411437944014
- Katie AyresSaint Louis, MO 631411467394783
Common questions
What is William Frederick Feldner, D.O.'s NPI number?
William Frederick Feldner, D.O.'s National Provider Identifier (NPI) is 1922085539, issued on Dec 23, 2005. An NPI identifies a provider in billing; it is not a license.
Where is William Frederick Feldner, D.O. located?
The NPPES record lists a practice address at 3009 North New Ballas Road Ste 226A, Saint Louis, MO, 63195. Phone: (314) 996-4900. Providers update this record themselves, so call before visiting.
How can I verify William Frederick Feldner, D.O.'s license?
NPPES lists Missouri license number R1J82, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Frederick Feldner, D.O. prescribe under Medicare Part D?
In 2024, William Frederick Feldner, D.O. had 5,665 Medicare Part D claims for 400 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.