STEPHEN E. GUILLIAMS, MD PA
STEPHEN E. GUILLIAMS, MD PA is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1003102351, based in Houston, TX. It is classified under Obstetrics & Gynecology Physician.
Getting there
Here is what surrounds this office in Houston, based on OpenStreetMap data collected Sep 5, 2026. Parking is available about 0.24 mi away. The nearest transit stop is 0.32 mi away, served by Richmond Ave @ S Kirkwood Rd.
Getting here and what is nearby
Parking 703 ft ~3 min
Parking 918 ft ~4 min
Parking 0.24 mi ~5 min
Transit Richmond Ave @ S Kirkwood Rd 0.27 mi ~6 min
Grocery Walmart Supercenter 0.31 mi ~7 min
2700 South Kirkwood Road, Houston 77077
Mo-Su 06:00-24:00
Transit Richmond Ave @ S Kirkwood Rd 0.32 mi ~7 min
Convenience 7-Eleven 0.38 mi ~8 min
Restaurant Toasted Yolk 0.42 mi ~9 min
12151 Westheimer Road, Houston 77077
Mo-Su 07:00-19:00
Restaurant Arpi's Phoenicia Deli & Coffee House 0.43 mi ~9 min
12151 Westheimer Road, Houston 77077
Mo-Th,Su 08:00-20:00; Fr-Sa 08:00-21:00
Restaurant Pappadeaux 0.46 mi ~10 min
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| E2591 | TX | Obstetrics & Gynecology Physician primary |
This provider holds licence E2591 issued in TX. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Obstetrics & Gynecology covers
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women. NUCC Health Care Provider Taxonomy, code 207V00000X
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-2 identifies an organization — a clinic, hospital, group practice, laboratory, or supplier. Individual clinicians working there hold their own NPI-1 numbers separately, so a bill may reference both.
| NPI | 1003102351 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Jun 24, 2011 |
| Last updated | Jun 24, 2011 |
| Status | Active |
| Practice address |
12121 RICHMOND AVE SUITE 203 Houston, TX 77082 (281) 558-5855 Fax (281) 558-5828 |
| Other identifiers |
098418901
· Medicaid (TX) |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 0 | 0 | 3 | 1 | 0 | 2 | 3 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 2 | 0 | 4 | 3 | 1 |
Sum = 39 · next multiple of 10 = 40 · check digit = 1 · actual last digit = 1
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.