Matthew Feldhammer, PHD
Matthew Feldhammer, PHD is a Clinical Laboratory Director (Non-physician) in Jacksonville, FL, registered under NPI 1477143733. This provider registers 5 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 655 W 8TH ST, Jacksonville, FL 32209. 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 |
|---|---|---|
| DL49402 | FL | Clinical Laboratory Director… primary |
| 1225 | DE | Chemistry Pathology… |
Licences are recorded in 2 states: FL, DE. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
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.
Licensed in 2 states
This provider holds licences in 2 states: Delaware and Florida. The practice address on file is in Jacksonville, FL, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
- Licence
- DL49402
- Specialty
- Clinical Laboratory Director…
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
What Clinical Laboratory Director, Non-physician covers
An individual who is state-licensed as a clinical laboratory director and meets the qualifications in the Clinical Laboratory Improvement Amendments of 1988 for non-physicians (non-MD/DO) as defined in the CFR 42 Part 493.1405. NUCC Health Care Provider Taxonomy, code 247ZC0005X
All registered taxonomy codes
This provider registers 5 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 247ZC0005X | Clinical Laboratory Director (Non-physician) Clinical Laboratory Director, Non-physician | DL49402 | FL | primary |
| 246QC1000X | Chemistry Pathology Specialist/Technologist Chemistry | 1225 | DE | |
| 246QI0000X | Immunology Pathology Specialist/Technologist Immunology | — | — | |
| 246QL0901X | Diplomate Laboratory Management Specialist/Technologist Laboratory Management, Diplomate | — | — | |
| 246ZB0500X | Biochemist Biochemist | — | — |
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 | 1477143733 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jan 21, 2021 |
| Last updated | Jan 21, 2021 |
| Status | Active |
| Sole proprietor | No |
| Credential | PHD |
| Practice address |
655 W 8TH ST Jacksonville, FL 32209 (904) 244-5076 |
| Mailing address |
655 W 8TH ST # C504 Jacksonville, FL 32209 |
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 | 7 | 7 | 1 | 4 | 3 | 7 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 4 | 5 | 7 | 2 | 4 | 6 | 7 | 6 |
Sum = 67 · next multiple of 10 = 70 · check digit = 3 · actual last digit = 3
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.