Sierra Arnold
Sierra Arnold is a Behavior Technician in Billings, MT, registered under NPI 1003437393. 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 Billings, based on OpenStreetMap data collected Sep 23, 2026. Parking is available about 0.35 mi away. A pharmacy sits 0.47 mi from the entrance (CVS Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.48 mi away.
Getting here and what is nearby
Parking 0.23 mi ~5 min
Restaurant Domino's 0.28 mi ~6 min
444 Broadwater Avenue, Billings 59101
Su-Th 10:30-01:00, Fr-Sa 10:30-02:00
Coffee Mountain Mudd Espresso 0.29 mi ~6 min
Gas station Sinclair 0.35 mi ~7 min
Parking 0.35 mi ~7 min
Parking 0.35 mi ~7 min
Pharmacy Specialty Pharmacy 0.41 mi ~9 min
Pharmacy CVS Pharmacy 0.47 mi ~10 min
Mo-Fr 08:00-21:00; Sa 09:00-18:00; Su 10:00-18:00
Coffee Starbucks 0.48 mi ~10 min
Grocery Albertsons 0.50 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
NPPES does not list a state licence number for this record. That is not unusual — organizations and some provider types are not required to file one. Verify current licensure with the relevant state board before care.
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 Technician covers
The behavior technician is a paraprofessional who practices under the close, ongoing supervision of a behavior analyst or assistant behavior analyst certified by the Behavior Analyst Certification Board and/or credentialed by a state (such as through licensure). The behavior technician is primarily responsible for the implementation of components of behavior-analytic treatment plans developed by the supervisor. That may include collecting data on treatment targets and conducting certain types of behavioral assessments (e.g., stimulus preference assessments). The behavior technician does not design treatment or assessment plans or procedures but provides services as assigned by the supervisor responsible for his or her work. NUCC Health Care Provider Taxonomy, code 106S00000X
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 | 1003437393 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 28, 2020 |
| Last updated | Jan 13, 2021 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Practice address |
708 BROADWATER AVE Billings, MT 59101 (406) 259-1680 Fax (406) 259-1777 |
| Other names |
Sierra Baker 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 | 3 | 7 | 3 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 8 | 3 | 5 | 3 | 9 |
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.