NPI age
16 years
Enumerated 2010-04-21
● Active
Type 1 · Individual
David Reeve Marker, MD
Marker is 1 of 903 radiology providers in Houston and 1 of 3776 in Texas.
Primary specialty
Radiology
Licensed in
TX
1 state
Status
Active
No deactivations on record
Last NPPES update
2018-04-12
Source: monthly bulk 2026-05
Sole proprietor
Yes
Solo practice on file
How this provider compares
Across 3776 active radiology providers in Texas.
NPI age
16 years
↓ 3 yr below median (19 yr)
State licenses
1 state
18% of peers hold multiple states
Subspecialties
0
36% of peers hold subspecialties
NPI lifetime · 2010 → 2026
2010-04Enumerated in NPPES
2010
2026
Where they practice
Practice location
6565 Fannin St # M204
Houston, TX 770302703
Mailing address
12312 Willow Woods Dr
Fredericksburg, VA 22407
Specialties
-
Radiology PrimaryA radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.
Practice context
Solo or small practice. No other active providers share this practice address in NPPES. This provider is listed as a sole proprietor.
Recently enumerated nearby: 4 new radiology providers have been added in Houston in the last 180 days.
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- Confirm the NPI on NPPES.The CMS registry is the system of record. Open NPPES →
- Check the state license is currently active.State licensing boards publish current status; NPPES does not.
- Confirm payer enrollment if billing.NPI presence does not guarantee active enrollment with Medicare, Medicaid, or commercial payers.