Susan Rethlefsen, P.T.
Susan Rethlefsen, P.T. is a Clinical Electrophysiology Physical Therapist in Los Angeles, CA, registered under NPI 1063548543. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 4650 W SUNSET BLVD MSC 69, Los Angeles, CA 90027. 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 |
|---|---|---|
| 21 | CA | Clinical Electrophysiology Physical… primary |
| 13000 | CA | Pediatric Physical Therapist |
This provider holds licence 21 issued in CA. 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 Electrophysiology, Clinical covers
A licensed physical therapist, including but not limited to an individual who is a Board Certified Specialist in Clinical Electrophysiologic Physical Therapy, who has demonstrated specialized knowledge and skill in electrophysiologic examinations and evaluations and encompasses both the professional and technical components of the observation, recording, analysis, and interpretation of bioelectric muscle and nerve potentials, detected by means of surface or needle electrodes, for the purpose of evaluating the integrity of the neuromuscular system. Electrophysiologic evaluations include, but are not limited to, electrodiagnostic testing, which includes clinical needle electromyography, motor and sensory nerve conduction studies, and other evoked potential procedures. NUCC Health Care Provider Taxonomy, code 2251E1300X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 2251E1300X | Clinical Electrophysiology Physical Therapist Electrophysiology, Clinical | 21 | CA | primary |
| 2251P0200X | Pediatric Physical Therapist Pediatrics | 13000 | CA |
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 | 1063548543 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Feb 26, 2007 |
| Last updated | Sep 11, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | P.T. |
| Practice address |
4650 W SUNSET BLVD MSC 69 Los Angeles, CA 90027 (323) 669-4120 Fax (323) 666-4409 |
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 | 6 | 3 | 5 | 4 | 8 | 5 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 3 | 3 | 1 | 4 | 7 | 5 | 8 |
Sum = 57 · next multiple of 10 = 60 · 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.