Mackay Ferrin
Mackay Ferrin is a Psychiatric/Mental Health Nurse Practitioner in Gilbert, AZ, registered under NPI 1003778119. 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 Gilbert, based on OpenStreetMap data collected Nov 12, 2026. Parking is available about 0.53 mi away. If you arrive early, there is a coffee shop 0.24 mi away.
Getting here and what is nearby
Restaurant IHOP 175 ft ~1 min
3495 East Baseline Road, Gilbert 85234
Restaurant Nando's 242 ft ~1 min
3519 East Baseline Road, Gilbert 85234
Restaurant Eegee's 376 ft ~2 min
3535 East Baseline Road, Gilbert 85234
Convenience Circle K 452 ft ~2 min
3589 East Baseline Road, Gilbert 85234
Gas station Circle K 521 ft ~2 min
Gas station Circle K 559 ft ~3 min
3589 East Baseline Road, Gilbert 85234
Coffee Starbucks 0.24 mi ~5 min
Grocery Original ChopShop 0.24 mi ~5 min
1850 South Val Vista Drive, Mesa 85204
Parking 0.26 mi ~6 min
Grocery AJ's Fine Foods 0.27 mi ~6 min
1836 South Val Vista Drive, Mesa 85204
Parking 0.53 mi ~11 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 |
|---|---|---|
| 245448 | AZ | Psychiatric/Mental Health Nurse… primary |
This provider holds licence 245448 issued in AZ. 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 Psychiatric/Mental Health covers
Definition to come... NUCC Health Care Provider Taxonomy, code 363LP0808X
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 | 1003778119 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Nov 26, 2025 |
| Last updated | Nov 26, 2025 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Practice address |
3489 E BASELINE RD Gilbert, AZ 85234 (480) 542-1212 |
| Mailing address |
3134 S MARKET ST APT 3087 Gilbert, AZ 85295 |
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 | 7 | 7 | 8 | 1 | 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 5 | 7 | 7 | 1 | 2 |
Sum = 51 · next multiple of 10 = 60 · check digit = 9 · actual last digit = 9
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.