Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Henry Jack Grainger, DO

Individual provider Cardiovascular Disease Physician · NPI 1306892005

Dr. Henry Jack Grainger, DO is an Internal Medicine in Houston, Texas. Qualified in 1973, 53 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
53
Licensed in
TX
In the registry since
2006
Specialties on file
3
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

511A W Tidwell Rd
Houston, TX 77091-4338
Phone: (713) 694-9709
Fax: (281) 618-8761
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence E1595 (TX)
Cardiovascular Disease Physician Taxonomy 207RC0000X · Licence E1595 (TX)
Geriatric Medicine (Internal Medicine) Physician Taxonomy 207RG0300X · Licence E1595 (TX)

Record details

NPI number1306892005
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedMay 25, 2006
Last updated in NPPESApril 12, 2021
Certification dateApril 12, 2021

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Also practisesCARDIOVASCULAR DISEASE (CARDIOLOGY), GERIATRIC MEDICINE
Medical schoolOTHER
Graduated 1973 (53 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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