William Cogan, D.C.
William Cogan, D.C. is a provider specialising in Chiropractor in Manhattan Beach, CA, registered under NPI 1003251182. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in Manhattan Beach, based on OpenStreetMap data collected Sep 14, 2026. Parking is available about 783 ft away at Public parking. There is EV charging 850 ft from the office — useful if you are driving in from out of town. The nearest transit stop is 0.23 mi away. If you arrive early, there is a coffee shop 0.25 mi away.
Getting here and what is nearby
Parking 428 ft ~2 min
Parking 436 ft ~2 min
Restaurant FISHBAR 578 ft ~3 min
3801 Highland Avenue, Manhattan Beach 90266
Restaurant Kotosh 689 ft ~3 min
3713 Highland Avenue, Manhattan Beach 90266
Parking Public parking 783 ft ~3 min
3714 Highland Avenue, Manhattan Beach 90266
EV charging 850 ft ~4 min
Transit Highland Avenue / Rosecrans Avenue 929 ft ~4 min
Coffee Offset 958 ft ~4 min
312 Rosecrans Avenue, Manhattan Beach 90266
Restaurant Panchos 936 ft ~4 min
3615 Highland Avenue, Manhattan Beach 90266
Transit Rosecrans Avenue / Alma Avenue 0.20 mi ~5 min
Transit 0.23 mi ~5 min
Coffee Two Guns Espresso 0.23 mi ~5 min
Convenience ExtraMile 0.23 mi ~5 min
601 Vista Del Mar, Manhattan Beach 90266
Gas station Chevron 0.23 mi ~5 min
Coffee Cafe Wild 0.25 mi ~5 min
3505 Highland Avenue, Manhattan Beach 90266
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 23228 | CA | Chiropractor primary |
| C000021 | GU | Chiropractor |
Licences are recorded in 2 states: CA, GU. 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: California and Guam. The practice address on file is in Manhattan Beach, CA, 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
- C000021
- Specialty
- Chiropractor
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 Chiropractor covers
A provider qualified by a Doctor of Chiropractic (D.C.), licensed by the State and who practices chiropractic medicine -that discipline within the healing arts which deals with the nervous system and its relationship to the spinal column and its interrelationship with other body systems. NUCC Health Care Provider Taxonomy, code 111N00000X
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 | |
|---|---|---|---|---|
| 111N00000X | Chiropractor | 23228 | CA | primary |
| 111N00000X | Chiropractor | C000021 | GU |
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 | 1003251182 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | May 2, 2013 |
| Last updated | May 2, 2013 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | D.C. |
| Practice address |
204 KELP ST Manhattan Beach, CA 90266 (310) 498-1230 |
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 | 2 | 5 | 1 | 1 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 4 | 5 | 2 | 1 | 7 |
Sum = 48 · next multiple of 10 = 50 · check digit = 2 · actual last digit = 2
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.