Matthew Tierney, RDCS
Matthew Tierney, RDCS is a Sonography Specialist/Technologist Cardiovascular in Tuba City, AZ, registered under NPI 1003196452.
Getting there
Here is what surrounds this office in Tuba City, based on OpenStreetMap data collected Sep 5, 2026. Parking is available about 243 ft away. If you arrive early, there is a coffee shop 0.37 mi away.
Getting here and what is nearby
Parking 146 ft ~1 min
Parking 227 ft ~1 min
Parking 243 ft ~1 min
Coffee Hogan Espresso 0.37 mi ~8 min
Mo-Sa 07:00-19:00; Su 09:00-16:00
Hotel NavajoLand Hotel 0.39 mi ~8 min
Restaurant The Hogan Restaurant 0.39 mi ~8 min
Mo-Su 06:30-21:00
Restaurant Taco Bell 0.44 mi ~9 min
Restaurant McDonald's 0.46 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 Sonography covers
A cardiovascular sonography technologist operates special equipment to create images and conduct tests of the cardiovascular system. They work with physicians who view the images and test results to assess and diagnose medical conditions. NUCC Health Care Provider Taxonomy, code 246XS1301X
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 | 1003196452 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Aug 17, 2011 |
| Last updated | Aug 17, 2011 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | RDCS |
| Practice address |
167 NORTH MAIN STREET Tuba City, AZ 86045 (928) 283-2501 Fax (928) 283-2677 |
| Mailing address |
PO BOX 600 Tuba City, AZ 86045 |
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 | 1 | 9 | 6 | 4 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 2 | 9 | 3 | 4 | 1 |
Sum = 48 · next multiple of 10 = 50 · check digit = 2 · actual last digit = 2
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.