Mark Guynn, M.F.T.
Mark Guynn, M.F.T. is a Marriage & Family Therapist in La Mesa, CA, registered under NPI 1003142266. 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 La Mesa, based on OpenStreetMap data collected Sep 7, 2026. Parking is available about 253 ft away. The nearest transit stop is 0.20 mi away, served by Allison Av & Date Av. A pharmacy sits 0.29 mi from the entrance (La Mesa Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.24 mi away.
Getting here and what is nearby
Parking 155 ft ~1 min
Parking 242 ft ~1 min
Parking 253 ft ~1 min
Restaurant Farmer's Table 540 ft ~3 min
8141 La Mesa Boulevard, La Mesa 91942
Mo-Th 09:00-21:00; Fr-Su 08:00-21:00
Coffee Lightbulb Coffee 613 ft ~3 min
8138 La Mesa Boulevard, La Mesa 91942
Mo-Sa 08:00-19:00; Su 08:00-18:00
Restaurant Subway 676 ft ~3 min
8142 La Mesa Boulevard, La Mesa 91942
Mo-Fr 09:00-21:00; Sa-Su 09:00-20:00
Restaurant Pizza Hut 697 ft ~3 min
Grocery Vons 745 ft ~3 min
Coffee Starbucks 841 ft ~4 min
Transit University Av & Allison Av 1,005 ft ~4 min
Transit Allison Av & Spring St 0.20 mi ~4 min
Transit Allison Av & Date Av 0.20 mi ~5 min
Hotel Lodge Of La Mesa; 0.23 mi ~5 min
7911 University Avenue, La Mesa 91941
Coffee Public Square Coffee House 0.24 mi ~5 min
Convenience Mr. D's 0.27 mi ~6 min
Grocery Sprouts Farmers Market 0.27 mi ~6 min
4630 Palm Avenue, La Mesa 91942
Mo-Su 07:00-22:00
Pharmacy La Mesa Pharmacy 0.29 mi ~6 min
Gas station Chevron 0.32 mi ~7 min
Hotel La Mesa Lodge 0.43 mi ~9 min
7961 El Cajon Boulevard, La Mesa 91941
Hotel National 9 Inn 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
| Licence | State | Specialty |
|---|---|---|
| 45713 | CA | Marriage & Family Therapist primary |
This provider holds licence 45713 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 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
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 | 1003142266 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Oct 22, 2009 |
| Last updated | Oct 22, 2009 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | M.F.T. |
| Practice address |
8058 LA MESA BLVD La Mesa, CA 91942 (619) 463-9742 Fax (619) 460-3707 |
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 | 1 | 4 | 2 | 2 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 2 | 4 | 4 | 2 | 3 |
Sum = 44 · next multiple of 10 = 50 · check digit = 6 · actual last digit = 6
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.