Darrell Williams
Darrell Williams is a Rehabilitation Practitioner in San Diego, CA, registered under NPI 1003511353.
Getting there
Here is what surrounds this office in San Diego, based on OpenStreetMap data collected Oct 2, 2026. Parking is available about 800 ft away. The nearest transit stop is 0.24 mi away.
Getting here and what is nearby
Parking 379 ft ~2 min
Transit 507 ft ~2 min
Parking 545 ft ~3 min
Parking 800 ft ~4 min
Transit 0.23 mi ~5 min
Transit 0.24 mi ~5 min
Restaurant Maritza's Mexican Food 0.32 mi ~7 min
Restaurant Papa John's 0.44 mi ~9 min
4089 Genesee Avenue, San Diego 92111
Mo-Th 10:30-23:00; Fr-Sa 10:30-01:00; Su 10:30-23:00
Convenience 7-Eleven 0.45 mi ~9 min
Convenience 7-Eleven 0.46 mi ~10 min
Restaurant El Portal 0.48 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 Rehabilitation Practitioner covers
A health care practitioner who trains or retrains individuals disabled by disease or injury to help them attain their maximum functional capacity. NUCC Health Care Provider Taxonomy, code 225400000X
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 | 1003511353 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 4, 2023 |
| Last updated | Apr 4, 2023 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Practice address |
5650 MOUNT ACKERLY DR San Diego, CA 92111 (858) 302-3300 |
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 | 5 | 1 | 1 | 3 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 1 | 1 | 2 | 3 | 1 |
Sum = 37 · next multiple of 10 = 40 · 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.