THOMAS A. LALLAS, MD, PC
THOMAS A. LALLAS, MD, PC is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1003053539, based in New York, NY. It is classified under Gynecologic Oncology Physician.
Getting there
Here is what surrounds this office in New York, based on OpenStreetMap data collected Sep 2, 2026. Parking is available about 0.47 mi away at Centerpark East 66th Street Parking Garage. The nearest transit stop is 809 ft away, served by Madison Avenue & East 69th Street. A pharmacy sits 0.49 mi from the entrance (Cherry's Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 946 ft away.
Getting here and what is nearby
Transit 5th Avenue & East 71st Street 222 ft ~1 min
Coffee Ralph's Coffee 380 ft ~2 min
888 Madison Avenue
Restaurant Via Quadronno 512 ft ~2 min
Mo-Fr 08:00-22:00; Sa,Su 09:00-22:00
Transit 5th Avenue & East 69th Street 700 ft ~3 min
Convenience Marche Madison 737 ft ~3 min
931 Madison Avenue
Transit Madison Avenue & East 69th Street 809 ft ~4 min
Coffee Poppi 860 ft ~4 min
20 East 69th Street, New York 10065
Su-Fr 07:00-19:00; Sa 08:00-18:00
Coffee The SisterYard 946 ft ~4 min
Hotel The Surrey 0.21 mi ~5 min
Restaurant Cafe Boulud 0.21 mi ~5 min
Grocery Nardos 0.23 mi ~5 min
807 Madison Avenue, New York 10065
Mon-Sat 10am-6pm
Hotel The Carlyle 0.25 mi ~6 min
Parking Loeb Boathouse Parking Lot 0.25 mi ~5 min
Restaurant Peng's Noodle Folk 0.27 mi ~6 min
Hotel The Mark 0.29 mi ~6 min
Convenience Freedom Market 0.31 mi ~7 min
Grocery D'Agostino 0.33 mi ~7 min
Lexington Avenue
Pharmacy Duane Reade 0.37 mi ~8 min
1091 Lexington Avenue, 10075
00:00-24:00 open "Store" || Mo-Fr 08:00-20:00; Sa 09:00-18:00; Su 10:00-17:00 open "Pharmacy"
Grocery Morton Williams 0.38 mi ~8 min
Parking 0.39 mi ~8 min
Pharmacy Eisler Chemists 0.46 mi ~10 min
1142 Lexington Avenue, 10075
Mo-Fr 09:00-19:00; Sa 09:00-17:00
Parking Centerpark East 66th Street Parking Garage 0.47 mi ~10 min
168 East 66th Street, New York 10065
Mo-Su 06:00-00:00
Convenience People's Place Convenience Shop 0.49 mi ~10 min
Pharmacy Cherry's Pharmacy 0.49 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 Gynecologic Oncology covers
An obstetrician/gynecologist who provides consultation and comprehensive management of patients with gynecologic cancer, including those diagnostic and therapeutic procedures necessary for the total care of the patient with gynecologic cancer and resulting complications. NUCC Health Care Provider Taxonomy, code 207VX0201X
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 | 1003053539 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Jan 21, 2009 |
| Last updated | Jan 21, 2009 |
| Status | Active |
| Practice address |
907 5TH AVE New York, NY 10021 (212) 838-0886 Fax (212) 327-0526 |
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 | 5 | 3 | 5 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 5 | 6 | 5 | 6 |
Sum = 51 · next multiple of 10 = 60 · check digit = 9 · actual last digit = 9
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.