Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. William Frederick Feldner, DO

Individual provider Family Medicine Physician · NPI 1922085539

Dr. William Frederick Feldner, DO is registered under Family Practice in Saint Louis, Missouri. Graduated from Oklahoma State University College of Osteopathic Medicine in 1987, 39 years ago. Practices with Physician Groups Lc, a 524-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in Missouri.

Years since qualifying
39
Trained at
Oklahoma State University College of Osteopathic Medicine
Licensed in
MO
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.

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Practice location Address checks out

3009 N New Ballas Rd Ste 226A
Saint Louis, MO 63195-2395
Phone: (314) 996-4900
Fax: (314) 996-4901
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1011 Bowles Ave, Fenton, MO 63026-2395 — (314) 467-1500

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence R1J82 (MO)
Sports Medicine (Family Medicine) Physician Taxonomy 207QS0010X · Licence R1J82 (MO)

Record details

NPI number1922085539
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedDecember 23, 2005
Last updated in NPPESSeptember 18, 2025
Certification dateSeptember 18, 2025

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolOKLAHOMA STATE UNIVERSITY COLLEGE OF OSTEOPATHIC MEDICINE
Graduated 1987 (39 years in practice)
Group practice Physician Groups Lc — 524 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations3 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients84
Services billed 1,097 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Also affiliated with 1 inpatient rehabilitation facility, which CMS identifies by certification number only.

Colleagues at Physician Groups Lc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 524 clinicians in the practice; 12 are shown here.

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