William Isaac Feingold, D.O.
Internal Medicine Physician · Dallas, TX
William Isaac Feingold, D.O. is an internal medicine physician with a practice address in Dallas, Texas, and NPI 1417392846, issued on Apr 29, 2013. Check the license (Texas Q7364, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- William Isaac Feingold
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- Q7364 TX
Self-reported in NPPES; status is on the state search - Practice location
- 3600 Gaston Ave, Dallas, TX 75246
- Phone
- (214) 820-3000
- Enumerated
- Apr 29, 2013
- Record last updated
- Mar 31, 2022
- Medicare enrollment
- Enrolled (PECOS I20170120000642); accepts Medicare assignment
- Medical or professional school
- Philadelphia College Of Osteopathic Medicine, 2013
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 9,175 in Texas → Look up another NPI →
Also registered at 3600 Gaston Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William Isaac Feingold in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license Q7364Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average internal medicine physician in 2024
183 Medicare Part D claims for 71 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 11 claims were for opioids.
Most prescribed
- Amoxicillin-Clavulanate Potass12 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: $568.17
25 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Pharmaceuticals, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Healthtexas Provider NetworkDallas, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Isaac Feingold among 9,175 internal medicine physician records in Texas
William Isaac Feingold, D.O. is one of 9,175 internal medicine physician records with a practice address in Texas. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 66% of them.
- NPI issued2013 · 66% of these records are older, 31% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2013 · median 2004 among the 6,088 with a school on file
- Record last updated2022 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
956 internal medicine physician records list a practice address in Dallas
They are 956 of the 36,304 NPPES records with a practice address in Dallas, and 9,175 internal medicine physician records in Texas.
All 9,175 in Texas → Every provider in Dallas → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Robert Allison, M.D.Dallas, TX 752461750339719
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- Linsheng Guo, M.D.Dallas, TX 752461053365510
- Donald Kennerly, MDDallas, TX 752461538124763
- Susan Kohl, MDDallas, TX 752461528098811
- Ruth Krishnan, M.D.Dallas, TX 752461265480685
- Andrew Masica, M.D.Dallas, TX 752461881625440
Common questions
What is William Isaac Feingold, D.O.'s NPI number?
William Isaac Feingold, D.O.'s National Provider Identifier (NPI) is 1417392846, issued on Apr 29, 2013. An NPI identifies a provider in billing; it is not a license.
Where is William Isaac Feingold, D.O. located?
The NPPES record lists a practice address at 3600 Gaston Ave, Dallas, TX, 75246. Phone: (214) 820-3000. Providers update this record themselves, so call before visiting.
How can I verify William Isaac Feingold, D.O.'s license?
NPPES lists Texas license number Q7364, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Isaac Feingold, D.O. prescribe under Medicare Part D?
In 2024, William Isaac Feingold, D.O. had 183 Medicare Part D claims for 71 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.