Sonya Leigh Merrill, MD, PHD
Sleep Medicine (Internal Medicine) Physician · Dallas, TX
Sonya Leigh Merrill, MD, PHD is a sleep medicine (internal medicine) physician with a practice address in Dallas, Texas, and NPI 1316954092, issued on Aug 2, 2006. Check the license (Texas L6114, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Sonya Leigh Merrill
- Credential
- MD, PHD
- Primary taxonomy
- Sleep Medicine (Internal Medicine) Physician 207RS0012X
- License number
- L6114 TX
Self-reported in NPPES; status is on the state search - Practice location
- 7777 Forest LN, Dallas, TX 75230
- Phone
- (972) 566-7684
- Enumerated
- Aug 2, 2006
- Record last updated
- Jul 16, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest sleep medicine (internal medicine) physician records → All 56 in Texas → Look up another NPI →
Also registered at 7777 Forest LN
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jillian AdamsPsychiatric/Mental Health Nurse Practitioner1033513031
- Jane Admire, MDOtolaryngology Physician1023139433
- Dessy Adont, APRN, AG-ACNPNurse Practitioner1710586870
- Alexandria Aguilar, CSFAOther Specialist/Technologist1376402784
- Azadeh Ajami, PSYDPsychologist1437278637
- Mustafa Al-Chalabi, MDEmergency Medicine Physician1417932948
Verify Sonya Leigh Merrill in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license L6114Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
41% fewer Medicare Part D claims than the average sleep medicine (internal medicine) physician in 2024
346 Medicare Part D claims for 70 beneficiaries, against an average of 585 among the 852 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims.
Most prescribed
- Gabapentin73 claims
- Doxepin Hcl71 claims
- Eszopiclone52 claims
- Zolpidem Tartrate Er29 claims
- Horizant21 claims
- Zaleplon17 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: $99.99
1 payment: education; the largest payer was Harmony Biosciences LLC. The 664 providers of this specialty with any payment received $3,724.37 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.
Sonya Leigh Merrill among 56 sleep medicine (internal medicine) physician records in Texas
Sonya Leigh Merrill, MD, PHD is one of 56 sleep medicine (internal medicine) physician records with a practice address in Texas. 80% 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 14% of them.
- NPI issued2006 · 14% of these records are older, 45% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileNo · 68% of these records are
- Record last updated2007 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RS0012X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Sleep Medicine (Internal Medicine) Physician providers in Texas
There are 56 sleep medicine (internal medicine) physician records in Texas.
All 56 in Texas → Every provider in Dallas → Sleep Medicine (Internal Medicine) Physician nationwide →
The 8 sleep medicine (internal medicine) physician records with the nearest ZIP codes
- Nabeel Farah, M.D.Dallas, TX 752311255533501
- Andrew Jamieson, M.D.Dallas, TX 752311710980362
- Katie Tran, M.D.Dallas, TX 752351639558414
- Thoris Pan, MDDallas, TX 752461598108730
- Aaron Pierce, MDDallas, TX 752461477842896
- Zachary Sherman, MDDallas, TX 752511710516612
- Shan Luong, M.D.Dallas, TX 753901780908442
- Marie Dibra, MDFrisco, TX 750341659661924
Common questions
What is Sonya Leigh Merrill, MD, PHD's NPI number?
Sonya Leigh Merrill, MD, PHD's National Provider Identifier (NPI) is 1316954092, issued on Aug 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Sonya Leigh Merrill, MD, PHD located?
The NPPES record lists a practice address at 7777 Forest LN, Dallas, TX, 75230. Phone: (972) 566-7684. Providers update this record themselves, so call before visiting.
How can I verify Sonya Leigh Merrill, MD, PHD's license?
NPPES lists Texas license number L6114, 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 Sonya Leigh Merrill, MD, PHD prescribe under Medicare Part D?
In 2024, Sonya Leigh Merrill, MD, PHD had 346 Medicare Part D claims for 70 beneficiaries; the average among sleep medicine (internal medicine) physician prescribers was 585. 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.