Marc Strawderman, ED.D., BSL, LBA
Marc Strawderman, ED.D., BSL, LBA is a provider specialising in Behavior Analyst in Norwalk, CT, registered under NPI 1003446980.
Getting there
Here is what surrounds this office in Norwalk, based on OpenStreetMap data collected Sep 27, 2026. Parking is available about 221 ft away. There is EV charging 0.46 mi from the office — useful if you are driving in from out of town. The nearest transit stop is 413 ft away. If you arrive early, there is a coffee shop 0.44 mi away.
Getting here and what is nearby
Parking 43 ft ~1 min
Parking 141 ft ~1 min
Parking 221 ft ~1 min
Transit 413 ft ~2 min
Coffee Starbucks 567 ft ~3 min
Gas station Mobil 873 ft ~4 min
31 North Avenue, Norwalk 06851
Grocery Stew Leonard's 0.25 mi ~6 min
Hotel The Guest House at Norwalk Inn 0.29 mi ~6 min
Hotel Norwalk Inn and Conference Center 0.30 mi ~6 min
Restaurant Aji 10 0.30 mi ~7 min
Coffee Pausa Caffe 0.37 mi ~8 min
9 Main Street, Norwalk
Tu-Sa 08:30-17:30; Su 08:30-16:30; Mo off
Restaurant Wendy's 0.37 mi ~8 min
Restaurant Mochica 0.38 mi ~8 min
75 Main Street, 06851
Mo-Fr 11:00-21:45; Sa-Su 08:00-21:45
Gas station Global 0.42 mi ~9 min
93 Main Street, Norwalk 06851
Coffee Bubbly's Bubble Tea 0.44 mi ~9 min
62 Wall Street, Norwalk 06850-3405
Tu-Fr 12:00-19:30; Sa-Su 11:30-19:30
Convenience A Taste of Philippines 0.44 mi ~9 min
Tu-Fr 10:00-18:00; Sa 11:30-17:00; Su 11:30-14:00
EV charging 0.46 mi ~10 min
Gas station Gulf 0.46 mi ~10 min
207 Westport Avenue, Norwalk 06851
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 |
|---|---|---|
| 9938 | TX | Behavior Analyst primary |
This provider holds licence 9938 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
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 | 1003446980 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jan 20, 2020 |
| Last updated | Apr 3, 2026 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | ED.D., BSL, LBA |
| Practice address |
14 WESTPORT AVE Norwalk, CT 06851 (713) 936-2790 |
| Mailing address |
168 JENNIFER DR New Oxford, PA 17350 |
| Other names |
Maranatha Thomas Former Legal Business Name |
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 | 4 | 4 | 6 | 9 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 8 | 4 | 3 | 9 | 7 |
Sum = 60 · next multiple of 10 = 60 · check digit = 0 · actual last digit = 0
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.