Matthew Southard, PH.D.
Matthew Southard, PH.D. is a Clinical Psychologist in New York, NY, registered under NPI 1003439027. 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 New York, based on OpenStreetMap data collected Sep 26, 2026. Parking is available about 0.42 mi away at Harlem River South Lot. The nearest transit stop is 556 ft away, served by Frederick Douglass Boulevard & West 145th Street. A pharmacy sits 0.21 mi from the entrance (Sugar Hill Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.47 mi away.
Getting here and what is nearby
Transit Frederick Douglass Boulevard & West 147th Street 348 ft ~2 min
Transit Frederick Douglass Boulevard & West 148th Street 360 ft ~2 min
Convenience A&H Organic Choice 350 ft ~2 min
2750 Frederick Douglass Boulevard, 10039
Convenience 148 Deli Grocery 390 ft ~2 min
Convenience New True Blue 424 ft ~2 min
Transit Frederick Douglass Boulevard & West 145th Street 556 ft ~3 min
Restaurant Popeyes 576 ft ~3 min
2730 Frederick Douglass Boulevard, New York 10039
10:30-24:00
Restaurant Domino's 578 ft ~3 min
2554 Adam Clayton Powell Jr, New York 10039
10:00-03:00
Restaurant Kensi Thai 597 ft ~3 min
Coffee Starbucks 758 ft ~3 min
301 West 145th Street, New York 10039
Mo-Fr 05:30-21:00; Sa, Su 06:00-21:00
Gas station Shell 733 ft ~3 min
Grocery Super Foodtown 738 ft ~3 min
Grocery Food City 760 ft ~3 min
2541 Adam Clayton Powell Jr. Boulevard, New York 10039
Mo-Th 07:00-21:00;Fr-Su 07:00-22:00
Pharmacy Duane Reade 912 ft ~4 min
320 West 145th Street, 10030
07:00-22:00 open "Store" || Mo-Fr 09:00-20:00; Sa 09:00-18:00; Su 10:00-17:00 open "Pharmacy"
Parking Centerpark Harlem Parking Garage 0.20 mi ~4 min
Pharmacy Capsule 0.20 mi ~5 min
122 West 146th Street, 10039
Mo-Fr 08:00-22:00; Sa, Su 10:00-18:00
Grocery Fine Fare Supermarket 0.20 mi ~4 min
Mo-Sa 07:00-00:00; Su 07:00-22:00
Pharmacy Sugar Hill Pharmacy 0.21 mi ~5 min
752 Saint Nicholas Avenue, 10031
Mo-Fr 08:30-18:30; Sa 10:00-19:00
Gas station Mobil 0.23 mi ~5 min
Coffee Sugar Hill Café 0.29 mi ~6 min
410 West 145th Street, New York 10031
Mo-Fr 07:30-15:30;Sa-Su 09:00-15:00
Parking Hamilton Grange 0.41 mi ~9 min
Parking Harlem River South Lot 0.42 mi ~9 min
Gas station Global 0.43 mi ~9 min
Hotel Saint Nicholas Inn 0.46 mi ~10 min
Coffee Yellow Banana Snack Bar 0.47 mi ~10 min
1658 Amsterdam Avenue, New York 10031
Hotel St Nicholas Hotel 0.47 mi ~10 min
889 Saint Nicholas Avenue
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 |
|---|---|---|
| 023407 | NY | Clinical Psychologist primary |
This provider holds licence 023407 issued in NY. 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 Clinical covers
A psychologist who provides continuing and comprehensive mental and behavioral health care for individuals and families; consultation to agencies and communities; training, education and supervision; and research-based practice. It is a specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems. NUCC Health Care Provider Taxonomy, code 103TC0700X
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 | 1003439027 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | May 26, 2020 |
| Last updated | May 26, 2020 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | PH.D. |
| Practice address |
287 W 147TH ST APT 5C New York, NY 10039 (716) 908-3059 |
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 | 4 | 3 | 9 | 0 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 8 | 3 | 9 | 0 | 4 |
Sum = 53 · next multiple of 10 = 60 · 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.