NPI age
18 years
Enumerated 2007-06-22
● Active
Type 1 · Individual
Marcia Heather Henderson, MD
Henderson is 1 of 14 internal medicine providers in Amarillo and 1 of 1318 in Texas.
Primary specialty
Internal Medicine
Plus 1 subspecialty
Licensed in
TX
1 state
Status
Active
No deactivations on record
Last NPPES update
2026-01-22
Source: monthly bulk 2026-05
Sole proprietor
Yes
Solo practice on file
How this provider compares
Across 1318 active internal medicine providers in Texas.
NPI age
18 years
≈ at median (18 yr)
State licenses
1 state
15% of peers hold multiple states
Subspecialties
1
In the 57% of peers with subspecialties
NPI lifetime · 2007 → 2026
2007-06Enumerated in NPPES
2007
2026
Where they practice
Practice location
6700 W 9th Ave
Amarillo, TX 791061701
Mailing address
Po Box 840020
Dallas, TX 752840020
Specialties
-
Internal Medicine PrimaryAn internist who treats diseases of the lungs and airways. The pulmonologist diagnoses and treats cancer, pneumonia, pleurisy, asthma, occupational and environmental diseases, bronchitis, sleep disorders, emphysema and other complex...
-
Internal MedicineA physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer,...
Practice context
Part of a multi-provider practice. 62 other active providers share this practice address in NPPES.
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