Douglas Larson, PH.D.
Douglas Larson, PH.D. is a provider specialising in Perfusionist in Tucson, AZ, registered under NPI 1003028317. 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 Tucson, based on OpenStreetMap data collected Aug 31, 2026. Parking is available about 606 ft away. There is EV charging 0.28 mi from the office (Blink) — useful if you are driving in from out of town. The nearest transit stop is 587 ft away. If you arrive early, there is a coffee shop 0.38 mi away.
Getting here and what is nearby
Parking UMC North Garage 389 ft ~2 min
PH,Mo-Su 00:00-18:00+
Transit Campbell/Adams 440 ft ~2 min
Transit Campbell/Adams 551 ft ~3 min
Transit 587 ft ~3 min
Parking Health Sciences Garage 559 ft ~3 min
Parking 606 ft ~3 min
EV charging Blink 0.28 mi ~6 min
Restaurant McDonald's 0.33 mi ~7 min
1711 East Speedway Boulevard, Tucson 85719-4514
24/7
Hotel Arizona Inn 0.35 mi ~8 min
Restaurant Chipotle 0.35 mi ~7 min
1903 East Speedway Boulevard, Tucson 85719
Mo-Su 23:00-10:45
Restaurant Pizza Hut 0.36 mi ~8 min
Coffee Bentley's Breakfast 0.38 mi ~8 min
Convenience 7-Eleven 0.39 mi ~8 min
1750 East Speedway Boulevard, Tucson 85719-4515
24/7
Hotel Aloft Tucson University 0.40 mi ~9 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 |
|---|---|---|
| 733042-0700 | AZ | Perfusionist primary |
This provider holds licence 733042-0700 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 Perfusionist covers
A perfusionist operates extracorporeal circulation and autotransfusion equipment during any medical situation where it is necessary to support or temporarily replace the patient's circulatory or respiratory function. The perfusionist is knowledgeable concerning the variety of equipment available to perform extracorporeal circulation functions and is responsible, in consultation with the physician, for selecting the appropriate equipment and techniques to be used. NUCC Health Care Provider Taxonomy, code 242T00000X
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 | 1003028317 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | May 7, 2007 |
| Last updated | Jul 8, 2007 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | PH.D. |
| Practice address |
1501 N CAMPBELL AVE SUITE 4402 ARIZONA HEALTH SCIENCE CENTER Tucson, AZ 85724 (520) 626-6339 |
| Mailing address |
4402 AHSC 1501 N. CAMPBELL AVE Tucson, AZ 85724 |
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 | 8 | 3 | 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 2 | 7 | 3 | 2 |
Sum = 43 · next multiple of 10 = 50 · check digit = 7 · actual last digit = 7
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.