MICHAEL G MYERS MD AND ERIC TREFELNER MD INC
MICHAEL G MYERS MD AND ERIC TREFELNER MD INC is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1003027806, based in San Mateo, CA. It is classified under Diagnostic Radiology Physician.
Getting there
Here is what surrounds this office in San Mateo, based on OpenStreetMap data collected Aug 30, 2026. Parking is available about 0.31 mi away. There is EV charging 0.35 mi from the office (Tesla Supercharger) — useful if you are driving in from out of town. The nearest transit stop is 0.34 mi away, served by West Hillsdale Boulevard & Glendora Drive. If you arrive early, there is a coffee shop 0.41 mi away.
Getting here and what is nearby
Parking 0.24 mi ~5 min
Parking 0.29 mi ~6 min
Parking 0.31 mi ~7 min
Transit West Hillsdale Boulevard & Clearview Way 0.33 mi ~7 min
Transit West Hillsdale Boulevard & Glendora Drive 0.33 mi ~7 min
Restaurant Celia's Mexican Restaurant 0.33 mi ~7 min
Transit West Hillsdale Boulevard & Glendora Drive 0.34 mi ~7 min
EV charging EVgo 0.34 mi ~7 min
Gas station Shell 0.34 mi ~7 min
EV charging Tesla Supercharger 0.35 mi ~8 min
Restaurant Nick the Greek 0.37 mi ~8 min
Coffee RareTea 0.38 mi ~8 min
1330 West Hillsdale Boulevard, San Mateo 94403
Tu-Su 12:00-20:00
Restaurant Toa Yuen 0.38 mi ~8 min
Coffee Starbucks 0.41 mi ~9 min
Grocery Piazza's Fine Foods 0.41 mi ~9 min
1218 West Hillsdale Boulevard, 94403
Mo-Su 07:00-22:00
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 |
|---|---|---|
| G68349 | CA | Diagnostic Radiology Physician primary |
This provider holds licence G68349 issued in CA. 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 Diagnostic Radiology covers
A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease. NUCC Health Care Provider Taxonomy, code 2085R0202X
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-2 identifies an organization — a clinic, hospital, group practice, laboratory, or supplier. Individual clinicians working there hold their own NPI-1 numbers separately, so a bill may reference both.
| NPI | 1003027806 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | May 24, 2007 |
| Last updated | Aug 22, 2020 |
| Status | Active |
| Practice address |
1475 WOODBERRY AVE San Mateo, CA 94403 (888) 318-8900 Fax (650) 345-5465 |
| Other names |
Nightshift Radiology Former Legal 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 | 0 | 2 | 7 | 8 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 2 | 5 | 8 | 0 |
Sum = 44 · next multiple of 10 = 50 · check digit = 6 · actual last digit = 6
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.