Sara Shack
Sara Shack is a Clinical Psychologist in Narberth, PA, registered under NPI 1003437351. 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 Narberth, based on OpenStreetMap data collected Sep 26, 2026. Parking is available about 345 ft away. If you arrive early, there is a coffee shop 0.39 mi away.
Getting here and what is nearby
Grocery Acme 189 ft ~1 min
829 Montgomery Avenue, Narberth 19072
Mo-Su 07:00-23:00
Parking 271 ft ~2 min
Restaurant Kismet Bagels 249 ft ~1 min
Parking 293 ft ~2 min
Restaurant Ryan Christophers BYOB 333 ft ~2 min
Parking 345 ft ~2 min
Restaurant Manhattan Bagel 509 ft ~2 min
856 Montgomery Avenue, Narberth 19072
06:00-14:30
Convenience Wawa 0.23 mi ~5 min
Coffee Get Café 0.35 mi ~8 min
Grocery American Family Super Market 0.38 mi ~8 min
230 Haverford Avenue, 19072
Coffee The Cheese Company 0.39 mi ~8 min
217 Haverford Avenue, Narberth 19072
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 |
|---|---|---|
| 8849L | PA | Clinical Psychologist primary |
This provider holds licence 8849L issued in PA. 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 | 1003437351 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 28, 2020 |
| Last updated | Apr 28, 2020 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Female |
| Practice address |
822 MONTGOMERY AVE STE 302 Narberth, PA 19072 (610) 664-6424 |
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 | 7 | 3 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 8 | 3 | 5 | 3 | 1 |
Sum = 49 · next multiple of 10 = 50 · check digit = 1 · actual last digit = 1
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.