Marjorie Eastlack
Marjorie Eastlack is a provider specialising in Behavior Analyst in Frisco, TX, registered under NPI 1003579723. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
Here is what surrounds this office in Frisco, based on OpenStreetMap data collected Oct 8, 2026. Parking is available about 204 ft away. If you arrive early, there is a coffee shop 0.46 mi away.
Getting here and what is nearby
Parking 96 ft ~1 min
Parking 171 ft ~1 min
Parking 204 ft ~1 min
Coffee Coffee U 726 ft ~3 min
Restaurant Einstein Bros. Bagels 0.38 mi ~8 min
5500 Preston Road, Frisco 75034
Mo-Sa 05:30-16:00; Su 06:00-15:00
Restaurant Taco Cabana 0.44 mi ~9 min
5350 Preston Road, Frisco
Coffee Starbucks 0.46 mi ~10 min
Restaurant Cicis Pizza 0.46 mi ~10 min
Convenience Race Trac 0.50 mi ~10 min
7940 Lebanon Road, Frisco
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 |
|---|---|---|
| 5631 | TX | Behavior Analyst primary |
This provider holds licence 5631 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 Behavior Analyst covers
A behavior analyst is qualified by at least a master's degree and Behavior Analyst Certification Board certification and/or a state-issued credential (such as a license) to practice behavior analysis independently. Behavior analysts provide the required supervision to assistant behavior analysts and behavior technicians. A behavior analyst delivers services consistent with the dimensions of applied behavior analysis. Common services may include, but are not limited to, conducting behavioral assessments, analyzing data, writing and revising behavior-analytic treatment plans, training others to implement components of treatment plans, and overseeing implementation of treatment plans. NUCC Health Care Provider Taxonomy, code 103K00000X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 103K00000X | Behavior Analyst | 5631 | TX | primary |
| 106S00000X | Behavior Technician | — | — |
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 | 1003579723 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Oct 19, 2021 |
| Last updated | Feb 6, 2023 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Practice address |
8501 WADE BLVD STE 1250 Frisco, TX 75034 (972) 312-8733 |
| Mailing address |
6105 WINDCOM CT STE 400 Plano, TX 75093 |
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 | 7 | 9 | 7 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 1 | 7 | 9 | 7 | 4 |
Sum = 57 · next multiple of 10 = 60 · check digit = 3 · actual last digit = 3
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.