Rosalyn Mills
Rosalyn Mills is a provider specialising in Behavior Analyst in Costa Mesa, CA, registered under NPI 1003374513.
Getting there
Here is what surrounds this office in Costa Mesa, based on OpenStreetMap data collected Sep 22, 2026. Parking is available about 0.52 mi away. The nearest transit stop is 0.23 mi away, served by Red Hill-Mccormick. If you arrive early, there is a coffee shop 0.45 mi away.
Getting here and what is nearby
Transit Red Hill-Mccormick 937 ft ~4 min
Transit Red Hill-Pullman 0.20 mi ~5 min
Transit Red Hill-Mccormick 0.23 mi ~5 min
Restaurant Panini Kabob Grill 0.40 mi ~9 min
3159-A Red Hill Avenue, Costa Mesa 92626
Mo-Sa 07:00-21:30
Coffee Starbucks 0.43 mi ~9 min
18601 Airport Way, Santa Ana 92707
Mo-Sa 05:00-22:30; Su 06:00-22:00
Coffee Farmer's Market 0.44 mi ~9 min
Mo-Sa 05:00-19:00; Su 06:00-19:00
Restaurant McDonald's 0.44 mi ~9 min
Restaurant Ruby's Diner 0.44 mi ~9 min
Mo-Su 06:00-19:00
Coffee Starbucks 0.45 mi ~10 min
Mo-Su 05:00-23:00
Convenience Ciao Gourmet Market 0.46 mi ~10 min
Mo-Fr 05:00-20:30; Su 06:00-20:30; Sa 05:00-19:00
Parking 0.50 mi ~11 min
Parking 0.51 mi ~11 min
Parking 0.52 mi ~11 min
3188 Airway Avenue, Costa Mesa 92626
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 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 | 1003374513 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 5, 2019 |
| Last updated | Nov 21, 2025 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Practice address |
3186 AIRWAY AVE STE A Costa Mesa, CA 92626 (714) 881-0427 Fax (714) 327-0673 |
| Mailing address |
105 N 13TH AVE APT B Upland, CA 91786 |
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 | 3 | 7 | 4 | 5 | 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 6 | 7 | 8 | 5 | 2 |
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.