NPI age
15 years
Enumerated 2011-02-27
● Active
Type 1 · Individual
MR. Mark Douglas Gilliland, CSA
Gilliland is 1 of 494 physician assistant providers in Houston and 1 of 1890 in Texas.
Primary specialty
Physician Assistant
Licensed in
—
0 states
Status
Active
No deactivations on record
Last NPPES update
2011-02-27
Source: monthly bulk 2026-05
Sole proprietor
Yes
Solo practice on file
How this provider compares
Across 1890 active physician assistant providers in Texas.
NPI age
15 years
↑ 4 yr above median (11 yr)
State licenses
1 state
5% of peers hold multiple states
Subspecialties
0
32% of peers hold subspecialties
NPI lifetime · 2011 → 2026
2011-02Enumerated in NPPES
2011
2026
Where they practice
Practice location
484 N Post Oak Ln
Houston, TX 770245911
Mailing address
484 N Post Oak Ln
Houston, TX 770245911
Specialties
-
Physician Assistant PrimaryDefinition to come...
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: 7 new physician assistant providers have been added in Houston in the last 180 days.
See all →
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Request a quote →How to verify this provider
- 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.