Louis Feldenberg, M.D.
Louis Feldenberg, M.D. is a Pediatric Nephrology Physician in Saint Louis, MO, registered under NPI 1295702314. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
The practice address on file is 1465 S GRAND BLVD, Saint Louis, MO 63104. 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 |
|---|---|---|
| 2006020968 | MO | Pediatric Nephrology Physician primary |
This provider holds licence 2006020968 issued in MO. 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 - Nephrology
- PAC ID
- 4385646934
Enrolled in Medicare 3 times, across 3 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| Missouri | I20070209000591 | Practitioner - Nephrology |
| Tennessee | I20250304002497 | Practitioner - Nephrology |
| New York | I20251002000840 | Practitioner - Pediatric Medicine |
Medicare enrolment is recorded as approved under the provider type Practitioner - Nephrology. There are 3 separate enrolment records across 3 states (MO, TN, NY). Multiple enrolments usually mean the provider bills Medicare from more than one practice location, or has kept an earlier enrolment after moving. Each record carries its own enrolment ID, listed above. 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 Pediatric Nephrology covers
A pediatrician who deals with the normal and abnormal development and maturation of the kidney and urinary tract, the mechanisms by which the kidney can be damaged, the evaluation and treatment of renal diseases, fluid and electrolyte abnormalities, hypertension and renal replacement therapy. NUCC Health Care Provider Taxonomy, code 2080P0210X
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 | 1295702314 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 7, 2006 |
| Last updated | Aug 26, 2015 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | M.D. |
| Practice address |
1465 S GRAND BLVD Saint Louis, MO 63104 (314) 268-4101 Fax (314) 577-5379 |
| Mailing address |
3691 RUTGER AVE St. Louis, MO 63110 |
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 | 2 | 9 | 5 | 7 | 0 | 2 | 3 | 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 2 | 9 | 5 | 5 | 0 | 4 | 3 | 2 |
Sum = 56 · next multiple of 10 = 60 · check digit = 4 · actual last digit = 4
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.