Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Margaret Ryan Markham, MD

Individual provider Obstetrics & Gynecology Physician · NPI 1770803967

Dr. Margaret Ryan Markham, MD is an Obstetrics/Gynecology in Houston, Texas. Qualified in 2010, 16 years ago. Practices with Hwca, PLLC, a 10-clinician group and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
16
Licensed in
TX
In the registry since
2010
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

7400 Fannin St Ste 1050
Houston, TX 77054-1920
Phone: (713) 795-1000
Fax: (713) 795-1011
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Obstetrics & Gynecology Physician (primary) Taxonomy 207V00000X · Licence P9903 (TX)

Record details

NPI number1770803967
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 10, 2010
Last updated in NPPESJanuary 26, 2022

Medicare enrollment

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

Medicare specialtyOBSTETRICS/GYNECOLOGY
Medical schoolOTHER
Graduated 2010 (16 years in practice)
Group practice Hwca, Pllc — 10 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations5 on file with Medicare

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