John Derwart
John Derwart is a Marriage & Family Therapist in Los Angeles, CA, registered under NPI 1003345968. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
Here is what surrounds this office in Los Angeles, based on OpenStreetMap data collected Sep 20, 2026. Parking is available about 568 ft away at Lot 35. There is EV charging 0.46 mi from the office — useful if you are driving in from out of town. The nearest transit stop is 547 ft away, served by Bonsall & Wilshire. A pharmacy sits 0.45 mi from the entrance (Barrington-Wilshire Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.50 mi away.
Getting here and what is nearby
Parking 220 ft ~1 min
Transit Wilshire & Bonsall (VA) 304 ft ~2 min
Transit Wilshire & Bonsall (VA) 352 ft ~2 min
Parking 454 ft ~2 min
Transit Bonsall & Wilshire 547 ft ~3 min
Parking Lot 35 568 ft ~3 min
Coffee Bluestone Lane 0.30 mi ~6 min
Coffee Caffe Luxxe 0.35 mi ~7 min
Convenience 7-Eleven 0.37 mi ~8 min
11656 Wilshire Boulevard, West Los Angeles 90025-1705
Restaurant Sugarfish by Sushi Nozawa 0.37 mi ~8 min
11640 West San Vicente Boulevard, Los Angeles 90049
Mo-Sa 11:30-22:00; Su 12:00-21:00
Restaurant Palmeri 0.41 mi ~9 min
11650 West San Vicente Boulevard, 90049
Restaurant Takao 0.42 mi ~9 min
11656 West San Vicente Boulevard, 90049
Pharmacy Allure Pharmacy 0.43 mi ~9 min
11670 West San Vicente Boulevard, 90049
Pharmacy Barrington-Wilshire Pharmacy 0.45 mi ~9 min
EV charging 0.46 mi ~10 min
Coffee The Coffee Bean & Tea Leaf 0.50 mi ~10 min
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
NPPES does not list a state licence number for this record. That is not unusual — organizations and some provider types are not required to file one. Verify current licensure with the relevant state board before care.
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 Marriage & Family Therapist covers
A marriage and family therapist is a person with a master's degree in marriage and family therapy, or a master's or doctoral degree in a related mental health field with substantially equivalent coursework in marriage and family therapy, who receives supervised clinical experience, or a person who meets the state requirements to practice as a marriage and family therapist. A marriage and family therapist treats mental and emotional disorders within the context of marriage and family systems. A marriage and family therapist provides mental health and counseling services to individuals, couples, families, and groups. NUCC Health Care Provider Taxonomy, code 106H00000X
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 | |
|---|---|---|---|---|
| 106H00000X | Marriage & Family Therapist | — | — | primary |
| 390200000X | Student in an Organized Health Care Education/Training Program | — | 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 | 1003345968 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 5, 2017 |
| Last updated | Jul 21, 2022 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Practice address |
11303 WILSHIRE BLVD BLDG 116 Los Angeles, CA 90025 (310) 914-4045 |
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 | 3 | 4 | 5 | 9 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 6 | 4 | 1 | 9 | 3 |
Sum = 52 · next multiple of 10 = 60 · check digit = 8 · actual last digit = 8
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.