Marilyn Stringer, CRNP
Marilyn Stringer, CRNP is an Obstetrics & Gynecology Nurse Practitioner in Philadelphia, PA, registered under NPI 1487978151.
Getting there
The practice address on file is 3400 SPRUCE ST 5 DULLES, Philadelphia, PA 19104. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| UP004539G | PA | Obstetrics & Gynecology Nurse Practitioner primary |
This provider holds licence UP004539G 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 Obstetrics & Gynecology covers
Definition to come... NUCC Health Care Provider Taxonomy, code 363LX0001X
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 | 1487978151 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 24, 2010 |
| Last updated | Mar 24, 2010 |
| Status | Active |
| Sole proprietor | No |
| Credential | CRNP |
| Practice address |
3400 SPRUCE ST 5 DULLES Philadelphia, PA 19104 (215) 662-6913 |
| Mailing address |
3624 MARKET ST SUITE 560W Philadelphia, PA 19104 |
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 | 4 | 8 | 7 | 9 | 7 | 8 | 1 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 4 | 7 | 7 | 9 | 7 | 7 | 1 | 1 |
Sum = 69 · next multiple of 10 = 70 · 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.