NPI age
19 years
Enumerated 2006-08-02
● Active
Type 1 · Individual
DR. Sonya Leigh Merrill, MD, PHD
Merrill is 1 of 12 internal medicine providers in Dallas and 1 of 114 in Texas.
Primary specialty
Internal Medicine
Licensed in
TX
1 state
Status
Active
No deactivations on record
Last NPPES update
2007-07-16
Source: monthly bulk 2026-05
Sole proprietor
No
May be part of a larger org
How this provider compares
Across 114 active internal medicine providers in Texas.
NPI age
19 years
↑ 3 yr above median (16 yr)
State licenses
1 state
9% of peers hold multiple states
Subspecialties
0
50% of peers hold subspecialties
NPI lifetime · 2006 → 2026
2006-08Enumerated in NPPES
2006
2026
Where they practice
Practice location
7777 Forest Ln, B116
Dallas, TX 75230
Mailing address
7777 Forest Ln, B116
Dallas, TX 75230
Specialties
-
Internal Medicine PrimaryAn Internist who practices Sleep Medicine is certified in the subspecialty of sleep medicine and specializes in the clinical assessment, physiologic testing, diagnosis, management and prevention of sleep and circadian rhythm disorders....
Practice context
Part of a multi-provider practice. 523 other active providers share this practice address in NPPES.
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- Confirm the NPI on NPPES.The CMS registry is the system of record. Open NPPES →
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- Confirm payer enrollment if billing.NPI presence does not guarantee active enrollment with Medicare, Medicaid, or commercial payers.