John Guynan, M.D.
John Guynan, M.D. is a Diagnostic Radiology Physician in Omaha, NE, registered under NPI 1003227398. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
Here is what surrounds this office in Omaha, based on OpenStreetMap data collected Sep 3, 2026. Parking is available about 598 ft away at Lot D. The nearest transit stop is 0.46 mi away, served by S 72nd St & Hickory St.
Getting here and what is nearby
Parking 296 ft ~2 min
Parking 492 ft ~2 min
Parking Lot D 598 ft ~3 min
Mercy Road, Omaha 68124
Restaurant The Drover 0.28 mi ~6 min
2121 South 73rd Street, Omaha 68124
Mo-Fr 11:00-14:00; Mo-Fr 17:00-22:00; Sa 16:30-22:30; Su 16:30-21:00
Restaurant Crystal Jade 0.30 mi ~6 min
Hotel Aksarben Suites 0.31 mi ~7 min
Transit S 72nd St & Cedar St 0.38 mi ~8 min
Transit S 72nd St & Mercy Rd 0.39 mi ~8 min
Grocery Walmart Supercenter 0.43 mi ~9 min
1606 South 72nd Street, Omaha 68124
sunrise-sunset
Transit S 72nd St & Hickory St 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
| Licence | State | Specialty |
|---|---|---|
| 32481 | NE | Diagnostic Radiology Physician primary |
This provider holds licence 32481 issued in NE. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Diagnostic Radiology
- PAC ID
- 2264734698
Enrolled in Medicare 2 times, across 2 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| Nebraska | I20200616001064 | Practitioner - Diagnostic Radiology |
| Iowa | I20200616001498 | Practitioner - Diagnostic Radiology |
Medicare enrolment is recorded as approved under the provider type Practitioner - Diagnostic Radiology. There are 2 separate enrolment records across 2 states (NE, IA). Multiple enrolments usually mean the provider bills Medicare from more than one practice location, or has kept an earlier enrolment after moving. Each record carries its own enrolment ID, listed above. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
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
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 390200000X | Student in an Organized Health Care Education/Training Program | — | — | |
| 2085R0202X | Diagnostic Radiology Physician Diagnostic Radiology | 32481 | NE | primary |
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 | 1003227398 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | May 8, 2014 |
| Last updated | Jul 9, 2020 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | M.D. |
| Practice address |
7500 MERCY RD Omaha, NE 68124 (402) 597-8775 Fax (402) 597-8811 |
| Mailing address |
14441 DUPONT CT STE 304 Omaha, NE 68144 |
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 | 2 | 2 | 7 | 3 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 4 | 2 | 5 | 3 | 9 |
Sum = 52 · next multiple of 10 = 60 · check digit = 8 · actual last digit = 8
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.