Marianne Carlson, PSYD
Marianne Carlson, PSYD is a Clinical Psychologist in Houston, TX, registered under NPI 1003584665. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in Houston, based on OpenStreetMap data collected Oct 7, 2026. Parking is available about 0.34 mi away at Texas Medical Center Garage 4. The nearest transit stop is 0.35 mi away, served by Shuttle Bus Stop #5. A pharmacy sits 996 ft from the entrance (Walgreens), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.46 mi away.
Getting here and what is nearby
Parking Smith Tower Parking 35 ft ~1 min
6550 Fannin Street, Houston 77030
Parking Scurlock Tower Parking 392 ft ~2 min
6560 Fannin Street, Houston 77030
Restaurant Einstein Bros. Bagels 646 ft ~3 min
Restaurant Citadel BBQ 689 ft ~3 min
Restaurant Go Fish 694 ft ~3 min
1709 Dryden Road, Houston 77030
Coffee Starbucks 754 ft ~3 min
Hotel The Westin Houston Medical Center 780 ft ~3 min
Pharmacy CVS Pharmacy 874 ft ~4 min
6622 Fannin Street, Houston 77030
Pharmacy Walgreens 996 ft ~4 min
Hotel SureStay Plus by Best Western Houston Medical Center 0.32 mi ~7 min
Transit 0.33 mi ~7 min
Transit 0.34 mi ~7 min
Parking Texas Medical Center Garage 4 0.34 mi ~7 min
1406 Cambridge Street, Houston 77030
Transit Shuttle Bus Stop #5 0.35 mi ~7 min
Hotel InterContinental 0.36 mi ~8 min
Coffee Little Kitchen HTX 0.44 mi ~9 min
Coffee Rice Coffeehouse 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 |
|---|---|---|
| 38750 | TX | Clinical Psychologist primary |
This provider holds licence 38750 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 Clinical covers
A psychologist who provides continuing and comprehensive mental and behavioral health care for individuals and families; consultation to agencies and communities; training, education and supervision; and research-based practice. It is a specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems. NUCC Health Care Provider Taxonomy, code 103TC0700X
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-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1003584665 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Aug 31, 2021 |
| Last updated | Sep 20, 2021 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Female |
| Credential | PSYD |
| Practice address |
6550 FANNIN ST Houston, TX 77030 (346) 248-2040 |
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 | 5 | 8 | 4 | 6 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 1 | 8 | 8 | 6 | 3 |
Sum = 55 · next multiple of 10 = 60 · check digit = 5 · actual last digit = 5
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.