John Wesley Mercer, M.D.
Family Medicine Physician · Wylie, TX
John Wesley Mercer, M.D. is a family medicine physician with a practice address in Wylie, Texas, and NPI 1235196957, issued on Apr 27, 2006. Check the license (Texas L1667, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- John Wesley Mercer
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- L1667 TX
Self-reported in NPPES; status is on the state search - Practice location
- 600 Cooper Dr, Wylie, TX 75098
- Phone
- (972) 442-7325
- Enumerated
- Apr 27, 2006
- Record last updated
- Jan 18, 2023
- Fax
- (972) 442-8348
- Medicaid ID
- 164914703 TX
- Medicare enrollment
- Enrolled (PECOS I20040525001583); accepts Medicare assignment
- Medical or professional school
- Louisiana State University School Of Medicine In New Orleans, 1997
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 11,119 in Texas → Look up another NPI →
Also registered at 600 Cooper Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Stacey Case, PTA, CLTPhysical Therapy Assistant1144622879
- Lauren DaughtryPhysical Therapist1205321114
- Katherine Parrott, DPTPhysical Therapist1992103329
- Tiffanie Sawall, PT, DPTPhysical Therapist1275982167
Verify John Wesley Mercer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license L1667Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
81% more Medicare Part D claims than the average family medicine physician in 2024
6,412 Medicare Part D claims for 331 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. 262 claims were for opioids.
Most prescribed
- Atorvastatin Calcium285 claims
- Montelukast Sodium210 claims
- Levothyroxine Sodium164 claims
- Hydrocodone-Acetaminophen159 claims
- Amlodipine Besylate152 claims
- Alprazolam148 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: $13.22
1 payment: food and beverage; the largest payer was GlaxoSmithKline, LLC. 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
- Healthtexas Provider NetworkDallas, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Wesley Mercer among 11,119 family medicine physician records in Texas
John Wesley Mercer, M.D. is one of 11,119 family 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 2006, is newer than 12% of them.
- NPI issued2006 · 12% of these records are older, 54% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated1997 · median 2004 among the 7,095 with a school on file
- Record last updated2023 · 51% 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 Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
11 family medicine physician records list a practice address in Wylie
They are 11 of the 530 NPPES records with a practice address in Wylie, and 11,119 family medicine physician records in Texas.
All 11,119 in Texas → Every provider in Wylie → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Madeline Carson, DOWylie, TX 750981942941992
- Travis Caudill, MDWylie, TX 750981578512059
- Mohammed Mohiuddin, MDWylie, TX 750981942308424
- Sandy Nguy, D.O.Wylie, TX 750981124473467
- Lisa Nguyen, D.O.Wylie, TX 750981720348022
- Philomena Osimiri, MDWylie, TX 750981518902105
- Tena Patterson, MDWylie, TX 750981205885670
- Mokarroma Sharmin, M.D.Wylie, TX 750981821263542
Common questions
What is John Wesley Mercer, M.D.'s NPI number?
John Wesley Mercer, M.D.'s National Provider Identifier (NPI) is 1235196957, issued on Apr 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Wesley Mercer, M.D. located?
The NPPES record lists a practice address at 600 Cooper Dr, Wylie, TX, 75098. Phone: (972) 442-7325. Providers update this record themselves, so call before visiting.
How can I verify John Wesley Mercer, M.D.'s license?
NPPES lists Texas license number L1667, 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 John Wesley Mercer, M.D. prescribe under Medicare Part D?
In 2024, John Wesley Mercer, M.D. had 6,412 Medicare Part D claims for 331 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.