Ian Nelligan, M.D.
Ian Nelligan, M.D. is a Family Medicine Physician in Palo Alto, CA, registered under NPI 1003106212. 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 Palo Alto, based on OpenStreetMap data collected Sep 5, 2026. Parking is available about 0.52 mi away at High/Alma South Garage (Lot R). There is EV charging 0.46 mi from the office (ChargePoint) — useful if you are driving in from out of town. The nearest transit stop is 429 ft away, served by Stanford Psychiatry Building. A pharmacy sits 976 ft from the entrance (Hoover Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.36 mi away.
Getting here and what is nearby
Transit Quarry Road & Arboretum Road 190 ft ~1 min
Transit Arboretum Road & Quarry Road 398 ft ~2 min
Transit Stanford Psychiatry Building 429 ft ~2 min
Coffee NM Cafe 795 ft ~4 min
EV charging Tesla Supercharger 850 ft ~4 min
Pharmacy Hoover Pharmacy 976 ft ~4 min
Restaurant Vina Enoteca 1,004 ft ~4 min
Coffee Tootsie's at the Stanford Barn 0.20 mi ~4 min
700 Welch Road, Palo Alto 94304-1519
Mo-Fr 06:30-15:00; Sa 10:00-15:00
Restaurant World Wrapps 0.22 mi ~5 min
600 Stanford Shopping Center, Palo Alto 94304
Mo-Su 11:00-20:00
Restaurant Gourmet Franks 0.22 mi ~5 min
199 Stanford Shopping Center, Palo Alto 94304
Coffee Blue Bottle Coffee 0.36 mi ~8 min
Convenience Corner Store 0.43 mi ~9 min
Hotel The Clement 0.45 mi ~10 min
711 El Camino Real
EV charging ChargePoint 0.46 mi ~10 min
Hotel Westin Palo Alto 0.46 mi ~10 min
Parking Roth Way Garage 0.46 mi ~10 min
345 Campus Drive, Stanford
Parking Pasteur Staff Garage 0.51 mi ~11 min
1189 Welch Road
Parking High/Alma South Garage (Lot R) 0.52 mi ~11 min
528 High Street
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 |
|---|---|---|
| A121255 | CA | Family Medicine Physician primary |
This provider holds licence A121255 issued in CA. 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 - Family Practice
- PAC ID
- 0840426847
- Enrollment ID
- I20131121001602
Medicare enrolment is recorded as approved under the provider type Practitioner - Family Practice. 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 Family Medicine covers
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity. NUCC Health Care Provider Taxonomy, code 207Q00000X
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 | 1003106212 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 10, 2011 |
| Last updated | Sep 17, 2013 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | M.D. |
| Practice address |
211 QUARRY RD Palo Alto, CA 94304 (650) 498-5409 |
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 | 0 | 6 | 2 | 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 2 | 0 | 3 | 2 | 2 |
Sum = 38 · next multiple of 10 = 40 · 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.